Category Archives: civil engineering

bricks, Building materials, civil engineering

Understanding Refractory Bricks: A Comprehensive Guide

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Refractory bricks are specialized construction materials designed to withstand extremely high temperatures, making them essential in industries such as steel, glass, ceramics, and  cement. These heat-resistant bricks maintain structural integrity and insulation in high-temperature environments like furnaces, kilns, and reactors. Whether you’re a builder, engineer, or homeowner planning a fire-safe project, understanding refractory bricks can help you choose the right materials for long-lasting performance. In this blog, we explore what refractory bricks are, their types, key properties, applications, and how to choose the right one for your project. We’ll also guide you on pricing and sourcing in India and beyond. Let’s dive into the world of refractory fire bricks and how they can improve safety and efficiency in thermal systems.

  1. What Are Refractory Bricks?
  2. Key Properties of Refractory Bricks
  3. Types of Refractory Bricks
    1. Fire Clay Bricks
    2. High Alumina Refractory Bricks
    3. Silica Refractory Bricks
    4. Magnesia Bricks
    5. Insulating Fire Bricks (IFB)
  4. Applications of Refractory Bricks
    1. Steel Industry
    2. Glass Industry
    3. Cement Industry
    4. Ceramics and Pottery
    5. Petrochemical Industry
    6. Power Generation
    7. Non-Ferrous Metal Industry
    8. Foundries
    9. Chemical Processing
    10. Waste Incineration
  5. Maintenance and Lifespan of Refractory Bricks
  6. FAQs
  7. Key Takeaways
  8. Conclusion

What Are Refractory Bricks?

Refractory bricks, also known as fire bricks, resist heat and retain their strength and structure under extreme thermal stress. Manufacturers make them from ceramic materials such as alumina, silica, magnesia, or chromite. These bricks differ from ordinary building bricks in their ability to resist thermal shock, corrosion, and abrasion. Commonly used in furnaces, fireplaces, and kilns, refractory bricks act as a barrier against heat loss and mechanical wear. Refractory experts categorize bricks into several types based on their material composition and properties, ensuring suitability for specific environments and temperatures.

Close-up view of stacked refractory bricks in warm tones, showcasing their uniform texture and arrangement.
Close-up view of refractories showcasing heat-resistant bricks, essential for industrial applications like kilns and furnaces.

Key Properties of Refractory Bricks

Refractory bricks exhibit the following core properties:

  • High Heat Resistance: Capable of withstanding temperatures exceeding 1,500°C.
  • Thermal Insulation: Low thermal conductivity prevents heat loss.
  • Mechanical Strength: Resists cracking, abrasion, and pressure under load.
  • Chemical Inertness: Withstands attack from acidic or basic slags.
  • Low Porosity: Ensures minimal moisture absorption and better insulation.

These properties make refractory bricks ideal for high-temperature industrial operations and thermal insulation applications.

Types of Refractory Bricks

  1. Fire Clay Bricks: Made from hydrated aluminum silicates; used in fireplaces, ovens, and boilers.
  2. High Alumina Bricks: Contain over 45% alumina; ideal for steel plants and glass melting furnaces.
  3. Silica Bricks: Withstand high temperatures and acidic environments; used in coke ovens.
  4. Magnesia Bricks: Excellent resistance to basic slags; suitable for  cement kilns.
  5. Insulating Fire Bricks (IFB): Lightweight and low thermal conductivity; used for insulation rather than structural load.

Each type serves a unique function depending on thermal, mechanical, and chemical demands.

Fire Clay Bricks

Craftsmen craft fire clay bricks from refractory clays rich in hydrous aluminum silicates, primarily kaolinite. These bricks can endure temperatures up to 1,775°C, making them particularly suitable for high-temperature applications such as fireplaces, ovens, and boilers. Additionally, their composition includes natural argillaceous materials, which may contain fine-grained micas and quartz, further enhancing their thermal stability. Furthermore, fire clay bricks exhibit excellent resistance to thermal shock. This is why they are commonly used for lining furnaces and kilns. As a result, their durability and cost-effectiveness make them a preferred choice in various industrial settings, where both performance and affordability are key considerations.

High Alumina Refractory Bricks

High alumina bricks contain a minimum of 45% alumina (Al₂O₃), with some premium grades exceeding 80%. As a result, they exhibit exceptional resistance to high temperatures, chemical corrosion, and mechanical wear. Industries such as steel plants, glass melting furnaces, and cement kilns widely use high alumina bricks due to these qualities. Furthermore, they offer high refractoriness, often above 1,750°C, which ensures performance under extreme heat. In addition, they demonstrate excellent thermal shock resistance, allowing them to withstand sudden temperature changes. Moreover, their low porosity and high density enhance their mechanical strength and durability. Consequently, high alumina bricks remain a reliable and long-lasting choice for industries that operate under aggressive thermal and chemical conditions.

High Alumina Refractory Bricks
High Alumina Refractory Bricks

Silica Refractory Bricks

Silica bricks consist primarily of silicon dioxide (SiO₂), typically exceeding 93% content. They withstand temperatures up to 1,700°C and resist acidic slags effectively. Engineers commonly use these bricks in constructing coke ovens, glass furnaces, and acid converters. Silica bricks also exhibit low thermal expansion and high thermal conductivity, which make them ideal for applications involving rapid temperature changes. Their ability to maintain structural integrity at high temperatures ensures they last longer in demanding industrial processes.

Silica Refractory bricks
Silica Refractory bricks

Magnesia Bricks

Magnesia bricks are primarily composed of magnesium oxide (MgO), offering excellent resistance to basic slags and high refractoriness, often above 1,800°C. They are widely used in environments where basic slags are prevalent, such as in steelmaking furnaces and  cement kilns. Magnesia bricks exhibit good thermal conductivity and are known for their ability to withstand thermal shocks. Their high melting point and chemical stability make them suitable for lining furnaces that operate under harsh conditions.

Insulating Fire Bricks (IFB)

Engineers design Insulating Fire Bricks (IFBs) as lightweight refractory bricks to provide thermal insulation. Their low thermal conductivity helps reduce heat loss and improve energy efficiency in furnaces and kilns. Made from refractory clays with high porosity, IFBs trap air, enhancing their insulation properties. They withstand temperatures ranging from 1,260°C to 1,760°C, depending on the grade. Common applications include using them as backup insulation in high-temperature furnaces, flue linings, and kilns.

Each type of refractory brick serves specific functions based on its thermal, mechanical, and chemical properties. These properties ensure optimal performance in various high-temperature industrial applications.

Applications of Refractory Bricks

Refractory bricks are critical in numerous applications:

  • Steel and Iron Furnaces: Line blast furnaces and converters.
  • Glass Manufacturing: Used in tank furnaces and regenerators.
  •  Cement Kilns: Withstand rotation and high heat.
  • Boilers and Incinerators: Offer insulation and corrosion resistance.
  • Home Fireplaces and Pizza Ovens: Provide a safe and durable lining.

Use-specific selection ensures performance and longevity of thermal systems.

Steel Industry

Refractory bricks line blast furnaces, converters, and ladles in steel production, enduring extreme temperatures and corrosive slags. Their thermal resistance ensures structural integrity during smelting and refining processes, making them indispensable for efficient and safe steel manufacturing.

Glass Industry

Glass manufacturers use refractory bricks to withstand high temperatures and chemical corrosion from molten glass. To ensure durability, they line melting furnaces and annealing lehrs with these bricks. As a result, the bricks provide thermal insulation and maintain structural stability. This stability, in turn, is crucial for achieving consistent glass quality. Moreover, it enhances energy efficiency during the production process. Therefore, refractory bricks play a vital role in ensuring the reliability and performance of glass manufacturing systems.

Cement Industry

Refractory bricks are essential in cement production, lining rotary kilns and coolers. They resist thermal shock and chemical erosion, ensuring the longevity of kilns and maintaining optimal temperatures for efficient clinker formation.

Ceramics and Pottery

In ceramics, refractory bricks line kilns and ovens, enduring high firing temperatures. Their thermal stability and resistance to thermal shock are vital for producing high-quality ceramic products without structural damage to kilns.

Petrochemical Industry

Refractory bricks line reactors, reformers, and furnaces in petrochemical plants, withstanding high temperatures and corrosive chemicals. Their durability ensures safe and efficient processing of petrochemical products.

Power Generation

In power plants, refractory bricks line boilers, incinerators, and chimneys, providing insulation and withstanding high temperatures. They enhance energy efficiency and protect structural components from thermal damage.

Non-Ferrous Metal Industry

Refractory bricks are used in furnaces and crucibles for smelting non-ferrous metals like aluminum and copper. They resist high temperatures and corrosive slags, ensuring the integrity of melting and refining processes.

Foundries

In foundries, refractory bricks line furnaces and ladles, enduring the intense heat of molten metals. Their thermal resistance and durability are crucial for safe and efficient metal casting operations.

Chemical Processing

Refractory bricks line reactors and containment vessels in chemical industries, withstanding high temperatures and corrosive substances. They ensure safe chemical reactions and longevity of processing equipment.

Waste Incineration

Refractory bricks line incinerators, enduring high temperatures and corrosive by products during waste combustion. They protect structural components and ensure efficient and safe waste disposal.

These applications highlight the versatility and critical role of refractory bricks in industries requiring high-temperature resistance and structural durability.

Maintenance and Lifespan of Refractory Bricks

Refractory bricks typically last 5–10 years in industrial use, depending on operating conditions. Maintenance tips:

  • Inspect for surface cracks or erosion regularly
  • Avoid water seepage to prevent structural weakening
  • Replace damaged bricks immediately to prevent hot spots
  • Reapply protective coatings if required in corrosive environments

Proper care extends performance and reduces long-term costs.

FAQs

Q1: What are refractory bricks made of?

They are made of ceramic materials like alumina, silica, magnesia, or combinations depending on temperature and corrosion requirements.

Q2: Which refractory  brick is best for a kiln? A: High alumina or insulating fire bricks are commonly used, based on whether structural strength or insulation is needed.

Q3: Can fire bricks be used in a fireplace? A: Yes, fire clay bricks are ideal for fireplaces due to their heat resistance and durability.

Q4: Are these bricks eco-friendly? A: Many modern bricks are made using low-emission processes and recyclable materials, enhancing their eco-credentials.

Key Takeaways

  • Refractory bricks withstand high heat and protect industrial furnaces, kilns, and ovens.
  • Multiple types (fire clay, high alumina, silica, magnesia) serve specific thermal and chemical needs.
  • Prices vary based on material and quality, with sourcing available locally and globally.
  • Regular maintenance ensures longer lifespan and safe performance.
  • Choosing the right refractory  brick enhances energy efficiency and structural safety.

Conclusion

Refractory bricks play a foundational role in high-temperature construction, offering heat resistance, durability, and safety. Understanding their types, properties, and applications helps in selecting the best option for industrial or residential use. Whether you’re lining a kiln or building a fireplace, the right brick ensures long-term efficiency and reliability. Always consult suppliers and material experts to get the best quality suited to your specific needs. Embrace heat with confidence—with the right refractory bricks in place.

civil engineering

Glass fiber reinforcement concrete – GFRC Ingredients, Mix and Applications

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Glass fiber reinforcement concrete or GFRC is made up of portland cement, fine aggregate, water, acrylic copolymer, alkali-resistant glass fibre, reinforcement, and additives. Glass fiber reinforced concrete or GFRC is a type of fiber-reinforced concrete. The glass fibres used in Glass Fiber reinforcement concrete give this distinctive compound its strength. Alkali-resistant fibres serve as the primary tensile load-carrying member, while the polymer and concrete mix holds the fibres together. It assists in the transfer of load from one element to another.

These are mainly used in exterior building façade panels and as architectural precast concrete. Somewhat similar materials are fibre cement siding and cement boards. They consist of high-strength, alkali-resistant glass fibre embedded in a concrete matrix.

In this form, both fibres and matrix retain their physical and chemical identities, while offering a synergistic combination of properties that cannot be achieved with either of the components acting alone.

Let’s get into each of them now.

  1. Glass Fiber Reinforcement Concrete – Ingredients
    1. Cement
    2. Fine Aggregates
    3. Polymers
    4. Water
    5. Glass Fibers
    6. Other Admixtures
  2. Glass Fiber Reinforced Concrete – Casting Process
    1. Spray-Up
  3. Glass Fiber Reinforcement Concrete Advantages
    1. Low weight and high strength of Glass Fiber Reinforced Concrete
    2. Freedom of shape of Glass Fiber Reinforced Concrete
    3. 3. Durability
    4. The appearance of Glass Fiber Reinforced Concrete
    5. Environment
  4. Applications of Glass Fiber Reinforced Concrete
  5. Conclusions

Glass Fiber Reinforcement Concrete – Ingredients

The main ingredients used in Glass Fiber Reinforced Concrete is as follows

Related contents from vinciviworld

Cement

Fine Aggregates

  • The fine aggregates usually should be river sand.
  • The fine aggregates used passed through a 4.75mm sieve and had a specific gravity of 2.68. The fine aggregates belonged to Zone II according to IS 383. 2

Polymers

  • Acrylic polymer is typically preferred over EVA or SBR polymers for GFRC. Acrylic is non-retweetable, so once dry, it will not soften or dissolve, nor will it yellow from exposure to sunlight.
  • The solids content of most acrylic polymers used in GFRC ranges from 46% to over 50%.
  • Typically, the polymer dose is 4%- 7% solids by weight of cementitious material depending on the design.

Water

Ordinary tap water which is safe and potable for drinking and washing was used to produce the concrete

Glass Fibers

  • Glass fibre, also known as fibreglass is made from extremely fine fibres of glass.
  • It is a lightweight, extremely strong and robust material. Glass fibre, the most popular of the synthetics, is chemically inert, hydrophobic, and lightweight.
  • They are manufactured as continuous cylindrical monofilaments that can be cut to specific lengths or cut as films and tapes before being formed into fine fibrils with rectangular cross-sections. Glass fibers that can withstand alkalis are a crucial part of GFRC. When using the spray-up method of casting, your sprayer will automatically cut the fibers and add them to the mixture as you apply it. If you’re casting with a premix or a hybrid method, you’ll have to mix the fibres along with other ingredients.
  • Although fibre content varies, it usually ranges from 3% to 7% of the total cementitious weight. High fibre content increases strength but decreases workability. Unlike most concrete mix design ingredients, fibres in GFRC are not calculated as a percentage of dry cementitious weight. Instead, they are calculated as a percentage of total weight. As a result, calculating fibre load in GFRC mix designs becomes quite complicated. Glass fibre, when used at a rate of at least 0.1 per cent by volume of concrete, reduces plastic shrinkage cracking and subsidence cracking over steel reinforcement.

Other Admixtures

  • Other ingredients to consider include pozzolans (such as silica fume, metakaolin, or VCAS) and superplasticizers.

So, we dug deep into the inside of Glass fibre-reinforced concrete. Next, let me walk you through the advantages of GFRC.

Glass Fiber Reinforced Concrete – Casting Process

GFRC is typically cast using two methods ie: spray up and premix. Let’s take a quick look at both, as well as a less expensive hybrid option.

Spray-Up

The fluid concrete mixture is sprayed into the forms, similar to shotcrete. The process employs a specialised spray gun to apply the fluid concrete mixture while simultaneously cutting and spraying long glass fibres from a continuous spool. Spray-up produces very strong GFRC due to the high fibre load and long fibre length, but the equipment is very expensive.

Premix

Premix incorporates shorter fibres into the fluid concrete mixture before it is sprayed or poured into moulds. Spray guns for premix do not require a fibre chopper, but they can be very expensive. Premix has less strength than spray-up because the fibres are shorter and distributed more randomly throughout the mix. The cost and strength are comparitievely lesser than spray up method.

Hybrid method

An inexpensive hopper gun can be used to apply the face coat while a handpacked or poured backer mix is used to create GFRC using a hybrid technique. A thin, fiber-free face (referred to as a mist coat or face coat) is sprayed into the moulds, and the backer mix is then packed in by hand or poured in, much like ordinary concrete. This is the method most concrete countertop manufacturers employ. This is an inexpensive way to get started. However, it is critical to carefully create both the face mix and the backer mix. This is to ensure similar consistency and makeup, as well as to know when to apply the backer coat. While doing so the backer coat can adhere properly to the thin mist coat without tearing it.

This method is comparatively inexpensive when compared to other two methods. The face and backer mix are applied at different times ensure to have similar make up of mixes to prevent curling

Glass Fiber Reinforcement Concrete Advantages

The main advantages are,

Glass fibre reinforced concrete
Glass fiber reinforced concrete

Low weight and high strength of Glass Fiber Reinforced Concrete

  • Self-weight of structures decreases when Glass Fiber Reinforcement Concrete (GFRC) is used and demands on foundations are reduced.
  • GRC cladding is suitable even for very high-rise buildings and offers good performance under seismic loading.

Freedom of shape of Glass Fiber Reinforced Concrete

  • GRC is easily moldable into a wide range of shapes, including intricate grilles, panels with a double curvature and 3-D objects.
  • The high freedom of shape permits the production of structurally very efficient elements.
  • Easily cast, it can produce items with very fine details and reproduce very complex features and elements of both modern and historic buildings.

3. Durability

  • Basic reinforcement is non-ferrous and the GRC products are not susceptible to corrosion as in traditional reinforced concrete.
  • Low permeability and a very slow rate of carbonation offer protection against the corrosion of steel in adjacent reinforced concrete.
  • GFRC has an inherently high resistance to extreme exposure conditions (freeze/thaw, fire etc.)

The appearance of Glass Fiber Reinforced Concrete

  • An extremely wide range of attractive surface finishes is available.
  • It satisfies the highest requirements for an aesthetic appearance of new structures and is capable of matching the colour and texture of surfaces of existing buildings.
  • Durable and brightly coloured surfaces with enhanced self-cleaning can be achieved in a variety of textures and shapes.

Environment

  • The relatively low weight of GRC products reduces CO2 emissions associated with their transport.
  • There are no Volatile_organic_compounds or other pollutants emitted from the material itself, neither in production nor in use.
  • GRC is fully recyclable into concrete and other applications.
  • In addition, the photocatalytic E-GRC reduces directly and significantly the concentration of pollutants in the surrounding air, leading to a better quality of the environment.
  • This is good especially in congested urban centres and at a minimal additional cost.

Also read: 3 d Printing buildings |Concrete Printing & Contour Crafting Methods Full Guide

Now, how about a quick glance through the applications?

Applications of Glass Fiber Reinforced Concrete

Glass Fiber Reinforced Concrete - Fascia
GFRC Building

Due to its versatility the range of GFRC is growing.

  • All the categories of buildings have been constructed using GFRC
  • Small, simple and unsophisticated items for everyday use are made using GFRC on a large-scale
  • Architects prefer GFRC to fulfil high structural complexity, size of construction elements, and freedom of shape to achieve spectacular appearance, durability and the highest quality
  • Positive environmental performance

That’s it. Time to sum up.

Conclusions

  • GFRC has a large scope of application and research and development is going on
  • It is a very versatile material and the freedom of shape makes it the number one choice by architects
  • Glass fibre reinforced concrete is used from small scale household products to large-scale buildings of structural complexity

So, how is our buddy GFRC? Let me know your thoughts in the comments.

Also read: Shotcrete – An overview| Shotcrete vs Gunite

Happy learning!

civil engineering

PCC Concrete – Plain Cement Concrete – PCC in Construction

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PCC concrete of Plain Cement Concrete (PCC) is without reinforcement steel. Plain cement concrete (PCC) is high in compression and very low in tension. Plain cement concrete is commonly used over the ground to keep footing reinforcement from coming into direct contact with the soil. The design mixes commonly used for Plain Cement Concrete (PCC) are 1:4:8, 1:3:5, 1:2:4, M7.5, M10 etc. PCC can also be used for grade slabs (floors) and concrete roads where the only load is compressive.

Concrete is a mixture of cement, sand, and aggregate (preferably broken stone) mixed with water in specific proportions. When poured into moulds or shuttered, the mixture consolidates over time to form a uniform mass known as concrete.

  1. What is PCC Concrete or Plain cement Concrete in construction?
  2. Properties of Plain Cement Concrete or PCC concrete
  3. Ingredients of Plain Cement Concrete or PCC Concrete
  4. Production of Plain Cement Concrete (PCC) in Construction
  5. Types of concrete in construction
  6. How to Decide On A Concrete Type
    1. Material Availability
    2. Strength Required
    3. Construction methodology to be adopted
    4. Type of structure
    5. Area of application
    6. Climate and pouring conditions
  7. Placing of Plain Cement Concrete (PCC)
    1. Level marking and dressing for PCC concrete
    2. Surface Preparation and shuttering
    3. Placing and Finishing of PCC Concrete
  8. Precautions while doing Plain Cement Concrete (PCC)

What is PCC Concrete or Plain cement Concrete in construction?

Concrete without reinforcement steel is called Plain Cement Concrete (PCC). Generally, design mixes commonly used for PCC are 1:4:8 , 1:3:5, 1:2:4, M7.5, M10 etc. Plain cement concrete is high in compression and very low in tension.

Plain cement concrete laying
Plain cement concrete laying

Properties of Plain Cement Concrete or PCC concrete

Plain cement Concrete (PCC) has compressive strengths ranging from 200 kg/cm2 to 500 kg/cm2. Likewise, tensile strength of PCC ranges from 50 kg/cm2 to 100 kg/cm2, and density ranges from 2200 kg to 2500 kg, depending on the grade of concrete and aggregates used.

Ingredients of Plain Cement Concrete or PCC Concrete

Basically, PCC is made from cement, coarse aggregate, and fine aggregate. Ordinary Portland cement is used as the binding material. Accordingly, as coarse aggregate, broken or crushed stone or brickbats must be used. However, fine aggregate must consist of coarse sand. Finally, these ingredients are combined in the appropriate proportions with potable water to make PCC.

Production of Plain Cement Concrete (PCC) in Construction

PCC can be manufactured in batching plants, mixer machines, or manually mixing. Generally, the thickness of PCC can range from 50 mm to 300 mm or more, depending on the design parameters.

Types of concrete in construction

The following are the main types of concrete used in construction

Plain cement concrete (PCC)
Plain cement concrete (PCC )

How to Decide On A Concrete Type

The type of concrete to be used on a particular work is decided based on following conditions.

Material Availability

Normally, the raw material (aggregate, sand, cement etc) availability decides the type of concrete to be used.

Plain cement concrete
Plain cement concrete


Strength Required

The concrete requires different strengths for different structures. However, the strength required for the particular structure decides the type of concrete to be used.

Construction methodology to be adopted

The construction technique to be adopted for a structure decides the type of concrete. Example Pre-stressed concrete etc.

Type of structure

Most of times the type of the structure decides the type of concrete to be used.

SELF COMPACTED CONCRETE (SCC) is preferred in structures where normal pouring is restricted due to rebar congestion or access restricted pouring area. SCC, when pumped from a single point, can fill every part of the structure. 

Area of application

The type of concrete shall be decided by the area where it has to be used. In some structures, the reinforcement is so dense that concrete may not pass through it. Mostly, In those cases, specially designed concrete with small-size aggregates or Self compacted concrete (SCC) may be used.

Climate and pouring conditions

The areas where there is extreme weather conditions like heavy rain , extreme cold, extreme hot specially designed quick setting concrete will be used.

Placing of Plain Cement Concrete (PCC)

The following steps are followed while placing Plain Cement Concrete (PCC)

Level marking and dressing for PCC concrete

After completing the excavation, the bottom level of the PCC shall be marked on the ground using a level machine. The centre line from the survey pillars shall be transferred to the ground where PCC has to be done. The surface shall be dressed manually to remove the loose soil the surface level to receive PCC.

Surface Preperation and shuttering

The surface shall be neatly dressed and supports has to be placed around using wooden battens. Accordingly, the battens used have to be the same size as PCC preferably. The battens shall be properly supported using proper supports (scrap steel can be used). The dressed surface shall be sprinkled with water to avoid absorption of concrete water by the soil.

Dressing for Plain Cement Concrete
Dressing for Plain Cement Concrete

Placing and Finishing of PCC Concrete

Concrete must be poured from one end to the other. For levelling purposes, level pillars at 2 metre intervals must be provided. The concrete must be levelled and rammed in accordance with the level pillars and end supports. The slump for PCC should be approximately 75 mm. Concrete must be poured within 30-45 minutes.

Precautions while doing Plain Cement Concrete (PCC)

  • When excavating, take care to only excavate to the required levels. However, avoid over-excavation. Backfilling with loose earth is not recommended if the excavation depth exceeds the required depth. In that case, we can place the PCC at the required level by doing a plum concrete. Backfilling with soil and compaction with plate compactors/walk-behind rollers/or Vibro rollers, depending on the situation, is required.
  • Before beginning excavation, the PCC level must be transferred to different locations. Before fine dressing with lime powder, the centerline and PCC dimensions must be marked on the ground to avoid reworks.
  • The surface on which PCC is to be laid shall be sprinkled with water.
  • Anti Termite chemical or LDPE sheets may sometimes be used before doing PCC. A confirmation has to be taken before doing the PCC from the clients/customers.
  • The free-falling height of concrete shall be restricted to 1.5 meters due to segregation issues.
civil engineering

Prefabricated and modular houses – 10 Amazing designs. | Advantages and Disadvantages

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Prefabricated and modular houses, as found in New City Paradise, are like putting together a puzzle. But best of all is that from one or more pieces, it is you who decides the final image. The future of housing design will probably be increasingly closer to the modality of prefabricated and modular houses.

And the reasons are simple and appeal to our old friend: common sense.

  1. Significance of Prefabricated and Modular Houses
  2. Disadvantages of Prefabricated and Modular Houses
  3. 10 Very Good Designs of Prefabricated and Modular Houses
    1. #1. CPH Shelter House
    2. #two. Modular Ecological Houses
    3. #3. The Smart Shelter
    4. #4. The Unseen House
    5. #5. House M2
    6. #6. The Big Box
    7. #7. Prefabricated House C6
    8. #8. Modular House in Container
    9. #9. The Arch House
    10. #10. Prefabricated Single Family Home

Significance of Prefabricated and Modular Houses

There are many advantages to this constructive modality:

  • Construction times are greatly reduced
  • The house (in its entirety or parts) is built in a workshop and not on the land
  • Less environmental impact due to: waste of materials, water contamination, less noise, and less energy consumption
  • There is greater control of the energy and bioclimatic behaviour of the house
  • Construction labour costs are reduced
  • The fieldwork is much less compared to the traditional way of building a house
  • It is very easy to expand the house since being modules; it is only enough to “add” one or more to the house
  • There are fewer construction labour conflicts because the entire construction process is done in the factory, in a scheduled and standardized manner

Disadvantages of Prefabricated and Modular Houses

And like everything in this life, prefabricated and modular houses also have their disadvantages:

  • In many cases, you must choose between pre-established designs
  • Costs are increased in the quality of the materials used. (Which is also an advantage regarding the quality that the house will have)
  • In matters of legislation, it is worth reviewing when you buy models of prefabricated and modular houses outside the country where you live
  • Local weather conditions should also guide you when choosing the prefabricated and modular home option. Not all houses will be designed according to the climate of the place where you live
  • The costs of moving the house to the land must be considered

In conclusion, and weighing both the advantages and disadvantages of the prefabricated and modular home design modality, it seems to me that there are more advantages than disadvantages.

So it is worth considering this alternative when building your house.

And to give you an idea of ​​the versatility offered by the prefabricated and modular home modality, here is a selection of 10 good designs that I have compiled for you.

I hope you enjoy them and tell me if it is easy for you or not to choose the one you like the most.

10 Very Good Designs of Prefabricated and Modular Houses

#1. CPH Shelter House

Prefabricated and Modular Houses
Prefabricated and Modular Houses – A very good design. A mobile, flexible and sustainable house. Built by the Danish firm CPH Shelter

A very good design. A mobile, flexible and sustainable house. Built by the Danish firm CPH Shelter

Building based on containers has many advantages:

  • Its construction is fast, flexible and modular
  • In most soils, very simple and inexpensive foundations are required
  • The assembly of the house on the ground takes very little time
  • They are very easy to move from one place to another

Being houses built in a modular way, they can easily be transformed into larger houses and adapted to the needs of each family.

This house is a passive design; that is, it makes the most of the use of clean energy, also taking care of the materials used, coatings and paints.

It has large windows and includes a kitchen, bathroom, living room, and bedroom, plus plenty of storage space.

#two. Modular Ecological Houses

Modular Ecological Houses
A house generates more energy than it consumes

The main idea of ​​this house is to maximize passive design strategies and the creation of spaces that flow through the house.

The walls are mobile so that the spaces grow as needed, making the rooms larger or smaller depending on the activity.

All this facing north and the winter garden, not only a place to air-condition the house but also to grow vegetables, to rest, relax, etc.

This design has been developed by the Australian company ArchiBlox.

#3. The Smart Shelter

Prefabricated and Modular Houses - The Smart Shelter
A 96m2 house was built in 10 months

The construction has been defined as a place to share leisure time enjoying the landscape.

The S-SE orientation maximizes thermal comfort in winter, and the sun protection ensures enjoyment in the summer season.

A very good design where simplicity and functionality prevail.

This project was designed and built by the Spanish company NOEM. 

NOEM’s motto reads:

«Design, modern, ecological and prefabricated wooden houses. High energy efficiency custom projects equipped with the most advanced eco-technology and designed under passive house standards.”

Your work is worth knowing!

#4. The Unseen House

Prefabricated Modular Houses - The Unseen House
The Unseen House

Casa Invisible is a flexible housing unit consisting of a prefabricated wooden structure designed for turnkey execution at any designated site

Maximum flexibility and spatial quality are the critical elements in its development concept.

This provides custom design options for the housing units as well as flexible pricing options.

The total dimensions are 14.50 x 3.50 meters, which facilitates transport by truck.

The key factors in this proposal are its uncomplicated assembly, its attractive price, and the free choice of location.

This design was developed by the Austrian firm DMAA. 

#5. House M2

Prefabricated Modular Houses - House M2
Prefabricated Modular Houses – House M2

The house has 2 bedrooms and 1 and a half bathrooms. It has a total area of ​​115 m2

The living/dining rooms and bedrooms are connected by a fibreglass “suspended bridge”.

Method Homes is one of North America’s most prestigious manufactured home companies.

They are specialists in modular houses, built in an artisanal way by authentic professionals, with excellent value for money.

Its quality and precision are unquestionable.

#6. The Big Box

Prefabricated and modular houses - The big box
A house with 2 bedrooms and a total area of ​​73m2

Clad in wood both outside and inside the house, which gives it a rustic and very modern design at the same time.

An outside terrace helps to “extend” the house outside.

The Bert & May Group (London) are specialists in modular manufacturing of houses with a very modern aesthetic.

The construction of this “ecological mobile home” takes only 14 weeks, and it can be assembled in a single day. Incredible!!!

Enjoy this Very Good Design!!!

#7. Prefabricated House C6

Prefabricated House - C 6

This design is part of the C6 series of model homes designed by the LivingHomes staff in collaboration with Make It Right, a non-profit organization founded by Brad Pitt and architect William McDonough.

The C6 series is the lowest cost design.

They combine clean and modern design, have floor plans adaptable to each client, improved finishes and artefacts, and many warehouses for storage.

The new C6 model is larger than the original C6 and features a streamlined roof and exterior.

#8. Modular House in Container

Modular house in container
Modular House in Container

This design is the smallest of the modular houses built by the company Nova Deko, in Australia

They use a 40-foot container and come up with good space-saving solutions that make the house compact and large at the same time.

Thanks to mechanisms such as folding doors and fitted wardrobes, the house offers a living space that does not feel claustrophobic.

There is a lot of efficiency in this design. Less is more!!!

#9. The Arch House

A prefabricated house, small and simple, but at the same time self-sufficient and intelligent

It can have a surface between 37 and 46m 2, depending on the model.

Solar panels make it energy self-sufficient. It also has good thermal insulation.

The house has the basic amenities of a house and the “California codes of modular construction”.

The design was made by the company Shelter Dynamics. 

#10. Prefabricated Single Family Home

Prefabricated single family Home
Prefabricated single-family Home

This house was designed by the Berlin-based studio  Brandt + Simon Architekten.

A design that seeks (and succeeds) to integrate with the landscape through a pixelated facade

The façade combines sustainable technologies with traditional cladding and hides a light timber frame construction.

In addition, a series of green building strategies are incorporated: layers of recycled paper are used for insulation, while solar panels support the heating system.

The internal structure allows a flexible organization of the rooms.

The kitchen and dining room are open to the terrace, while the ground floor spaces overlook a small part of the garden

I hope that this visual walk through these 10 Prefabricated and Modular Houses has inspired you.

I think it is worth considering this option when evaluating different modalities to build the house of your dreams.

But above all, I would like you to know that there are always alternatives.

There are always options when what guides you is the dream of building your own house.

And do not forget that whatever method you choose to build your house, try to have a good design and quality.

A good design will make your home a beautiful, welcoming place, a place where you can be happy with the people you love. For more home ideas, please visit New City Official Site.

civil engineering

Types of foundations in civil engineering

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Types of foundations – This article focuses on different types of foundations used in civil engineering. The foundation is the most crucial component of any structure/building because it transfers the total loads of the structure and its components to a competent ground surface. There are two types of foundations. ie: Shallow foundations and deep foundations

Types of Foundations – Related Posts

  1. Types of foundations – How to decide?
  2. Deciding the size and types of foundations
  3. Safe bearing capacity
  4. Types of foundations
  5. Shallow foundations
  6. Types of foundations – Shallow foundations
    1. Spread footing or isolated footing
    2. Simple spread footing
    3. Sloped spread footing
    4. Stepped spread footing
    5. Strip footing
    6. Combined footing
    7. Strap footing
    8. Types of foundations – Raft foundation /Mat foundation
  7. Types of foundations – Deep foundations
    1. Pile foundations
    2. Basement foundations
    3. Caissons foundation
    4. Hollow box foundations or Buoyancy foundations
    5. Drilled shaft foundation
  8. Conclusion

Types of foundations – How to decide?

The foundation is the most essential element of a structure. A well-designed foundation is critical to protecting a structure from dead loads, live loads, and external forces acting on the structure. The foundation is the final part of the structure to make contact with the ground. The foundation bed is the area where the foundation meets the ground. Before we get into the different types of foundations, let’s converse about substructure and superstructure. Each structure is subdivided into Superstructure &  Substructure Substructure refers to components of a structure that are below ground level, while superstructure refers to components that are above ground level. The foundation belongs to the substructure category and is responsible for transferring loads from superstructure components to the ground.

Deciding the size and types of foundations

The type of foundation is determined by the soil’s bearing capacity and the purpose of the structure. Geotechnical engineering is a branch of civil engineering that analyses the physical and chemical properties of soil in order to provide input to designers on soil properties and proposed foundation types and sizes.

Safe bearing capacity

A soil’s bearing capacity is its ability to support a structure without settlement or failure. The bearing capacity of soil must be calculated at various locations to ensure the structure’s safety. To determine the safe bearing capacity of the soil, the ultimate bearing capacity should be divided by a factor. The maximum load per unit area that soil can withstand without settlement and failure is defined as safe bearing capacity. Field tests or soil investigations are often used to determine the safe bearing capacity of the soil.

Types of foundations

Foundations are broadly classified into

For more details about shallow and deep foundations please follow this article

Types of foundations – Shallow foundations

Shallow foundations transfer the load to the soil laterally. It’s also known as stripped foundations. A shallow foundation has a depth that is less than its width. Shallow foundations are used when the load acting on a structure is reasonable and there is a competent soil layer capable of negotiating the loads available at a shallow or shorter depth. A shallow foundation is laid on the ground’s surface. A shallow foundation’s depth can range from 1 meter to 3.5 meters, and sometimes even more.

Shallow foundations can be of various types, depending on the site conditions and design requirements.

Spread footing or isolated footing

The spread footing is one of the most common types of shallow foundations. They are also known as isolated footings or individual footings. Spread footings are further classified based on their shape into simple spread footing, sloped spread footing, and stepped spread footing.

  • Simple spread footing
  • Sloped spread footing
  • Stepped spread footing

Simple spread footing

A simple spread footing is made up of a base footing and a single column on top of it. This foundation is used for structures with reasonable/moderate loads and bearing capacities.  

Simple Spread Footing
Simple spread footing

Sloped spread footing

Footings in this type of foundation are sloped, as shown in the figure. The footing is supported by a single column and has a trapezoidal cross-section.

Sloped Spread Footing
Sloped Spread Footing

Stepped spread footing

When the loads are heavy, steps are provided in the footings, as shown in the figure.

Stepped Spread Footing
Stepped Spread Footing

Strip footing

Strip footings are also known as wall footings. They are used to provide load-bearing brick/stone/RCC walls over the footings. Strip footings run continuously along a building’s wall. These footings are also used when the column spacing is very close and the footings overlap.

Strip Footing
Types of foundation – Strip footing

Combined footing

A combined footing is made up of two or more columns laid over a single footing. These footings are used when the distance between two individual footings is very small and they overlap. A combined footing is also provided in areas where further excavation is not possible due to boundary flushing. Rectangular combined footings and trapezoidal combined footings are the two types of combined footings.

  • Rectangular combined footings
Rectangular Combined Footing
Foundation type-Rectangular Combined Footing
  • Trapezoidal combined footings
Trapezoidal Combined Footings
Trapezoidal Combined Footing

Strap footing

Strap footings, also known as cantilever footings, are made up of two individual footings connected by a beam strap. The beam strap is designed as a rigid structure. These types of foundations are less expensive than combined footings.

Strap Footing
Strap Footing

Types of foundations – Raft foundation /Mat foundation

Raft foundations are the most common foundation types used in construction. It is a continuous slab that rests on the soil and covers the entire area of the proposed structure. Raft foundations are categorized based on their intended use. Numerous factors, such as bearing capacity, loads, site conditions, and so on, influence the type of raft foundation. A raft foundation/mat foundation is a solid slab which spans the entire structure area and is placed at a predetermined depth. Raft foundations are comprised entirely of columns and shear walls which transfer the structure’s load to the ground. These foundations are generally used when the soil’s bearing capacity is low and individual footings struggle to negotiate the loads. The raft foundation aids in the transfer of the entire load of the structure to a larger area.

Raft Foundation
Raft Foundation

For more information on a raft foundation, please see our blog

Raft foundations – Types and Advantages.

Types of foundations – Deep foundations

The foundations having a depth more than a width are called deep foundations. When the subsoil strata lack the safe bearing capacity to handle the loads induced by the structure, deep foundations are proposed. In such a case, the foundations’ founding level is moved to a deeper area with the required bearing capacity. The structure’s loads are transferred vertically into the ground.

Many applications adopt deep foundations. They are considered the safest option for transferring heavy loads on soil strata with low bearing capacities. The following are examples of common Deep foundations in use.

  • Basement foundations
  • Caissons Foundation
  • Hollow Box Foundation or Buoyancy foundations
  • Drilled shaft foundations
  • Pile foundations

Pile foundations

Pile foundations are long, slender members made of concrete, steel, or any other material which are used to transfer loads from a structure when the subsoil lacks bearing capacity. The pile foundations transfer the load vertically through the less dense top layer to a denser soil/rock layer which can negotiate the loads without failure.

For more details read our article: Pile foundations – Types and advantages

Basement foundations

Basement foundations are substructure foundations designed to account for parking areas, underground tanks, electrical systems, and storage spaces beneath a building below ground level. They are commonly used in high-rise residential and commercial structures. Basement foundations are designed to address the functional needs of parking and storage.

Caissons foundation

A caisson foundation is a water-retaining structure that serves as a working space for pier foundation operations. They are box-like constructions built of wood, steel, concrete, and other materials. Caisson Foundation is sunk by excavating the earth within the foundation. Caissons are prefabricated above ground or water level and sunk to the founding level as a single unit. They are built to facilitate excavation and related operations for dock structure foundations, bridges, jetties, piers, foreshore protection, and so on. These structures are eventually incorporated into the main structural components.

Hollow box foundations or Buoyancy foundations

The concept behind a hollow box foundation is to create a structure that has little or no impact on the original soil stress before commencing excavation. Overburden is removed as required by the design, and superstructure loads are transferred to the ground. These foundations are referred to as buoyancy foundations because they follow the principle of a ship floating in the water, where the displaced water balances the ship’s weight.

Drilled shaft foundation

The drilled shaft is a versatile foundation system that is widely used nowadays. These foundations are also referred to as drilled piers, drilled caissons, bored piles, and so on. The main idea is to excavate a cylindrical shaft and then cast it after adding the necessary reinforcements. Drilled holes should be between 1-3 meters in diameter and up to 100 meters deep. Shafts can be drilled to depths of 100 meters and diameters varying from 1 to 3 meters. However, greater depth and diameter are now conceivable. These foundations can partially replace driven piles in the same way that a single drilled shaft can replace a group of piles.

Drilled shaft foundations
Drilled shaft foundations

Conclusion

Shallow foundations are very easy to construct and do not require highly skilled manpower and professional supervision. These foundations can even be built with the assistance of semi-skilled workers. A shallow foundation is very economical when compared with a deep foundation. Shallow foundations are end-bearing type foundations that transfer loads to the end of the foundation. Shallow foundations are considered the most preferred option when the safe bearing capacity of the soil is reasonable and the structural loads are within the permissible limits.

civil engineering, surveying

Classification of Surveying – A complete overview

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Classification of Surveying is a fundamental topic in civil engineering. This is because almost every project begins with measuring and mapping the ground. Surveying determines the relative position of points on the earth. It also measures directions, distances, elevations, and areas. These measurements are used to prepare layouts at a chosen scale. In practice, surveyors apply different Types of Surveying and Land Surveying Methods through reconnaissance, measurement, marking and plan preparation. These Surveying Techniques in Civil Engineering demand high precision and good mathematical skills to analyse field data accurately. By understanding Methods of Surveying Classification, including the difference between Plane vs Geodetic Surveying, engineers can select the most suitable approach for each site and structure. In this article, we explore how surveying is classified and where each type is typically used.

  1. Classification of surveying
  2. Primary classification of surveying
    1. Plane surveying
    2. Geodetic surveying
  3. Classification of surveying based on field nature
    1. Land surveying
      1. Topographical surveying
      2. Cadastral surveying
      3. City surveying 
    2. Hydro-graphic surveying
    3. Astronomical surveying
  4. Classification of surveying based on purpose
    1. Engineering survey
    2. Military survey
    3. Mining surveying
    4. Geological survey
    5. Archaeological survey
  5. Classification of surveying based on instruments
    1. Chain surveying
    2. Theodolite surveying
    3. Traverse survey
    4. Triangulation survey
    5. Tacheometric survey
    6. Plane table survey
    7. Photogrammetric survey

Classification of surveying

Surveying is divided into different types to ensure accurate measurement methods are selected for specific project requirements and field conditions.

  • Primary classification of surveying
  • Classification of surveying based on field nature
  • Classification of surveying based on purpose
  • Based on Instruments classification of surveying

Also Read : Principle of surveying – First and second principle

The details of every classification basis is explained in detail in this article

Classification of surveying - Total Station
Classification of Surveying – Total Station

Primary classification of surveying

The primary classification is based on the earth’s surface. We know earth is an oblate spheroid. So while surveying we must consider the earth as either plane or as curved. Primarily we can divide surveying into two types and are as follows.

Plane surveying

For plane table surveying the earth’s surface is considered as a plane. Therefore we should neglect the corrections due to earth curvature. The line which connects these points is a straight line. The triangles made by joining these lines are Plane triangles. This type of surveying is useful for limited areas. ie less than 200 sq.m.

Geodetic surveying

In Geodetic surveying, the earth’s surface is considered as a curve. So the line which connects these points are curves and the triangles made joining these lines are Spherical triangles. Geodetic surveying is used for large areas of more than 200 sq.m.

Classification of surveying based on field nature

Land surveying

Land surveying is the art of establishing or re-establishing corners, lines, boundaries, and monuments of property or land. This is based upon recorded documents, historical evidence, and present standards of practice. It helps in preparation of topographical maps, planning, and estimation of project works, locating boundary lines, etc. Land surveying is classified into three types.

  • Topographical surveying
  • Cadastral Surveying
  • City surveying

Topographical surveying

The main application of a topographical survey is the drafting of maps. Topographical surveys include surveying natural and artificial features such as rivers, hills, roads, canals, etc. It consists of horizontal, vertical, and angular measurements. The scale range is 1: 25000 to 1: 1000000.

Cadastral surveying

The main use of this surveying is in the documentation process while transferring ownership from one person to another. It helps in defining the boundaries and land area calculations. It also called Public land survey.

City surveying 

City surveying provides information for the construction of water supplies, sewage lines etc.

Hydro-graphic surveying

Hydro-graphic surveying deals with the surveying of water bodies. They help in offshore construction activities. Hydro-graphic surveying is also known as Marine surveying. It helps in determining the mean sea level calculation, water depth calculation, dredging analysis, etc.

Astronomical surveying

This type of surveying observes the heavenly bodies such as the sun, moon, and stars. It helps locate the absolute location and lines on the surface of the earth. It also determines the azimuth, latitude, longitude, and time.

Astronomical Surveying
Astronomical Surveying

Classification of surveying based on purpose

Engineering survey

This type of surveying helps to analyse the field data for engineering works. These include the construction of roads, railways, and sewage pipelines.

Military survey

This type of surveying helps the military services like the army, navy etc to determine the location of strategic importance. Through this surveying, we can provide maps of broader areas. Since it uses advanced technologies like remote sensing, GIS and GPS, we get precise field details.

Mining surveying

A mining survey determines the location of points in the underground for mine planning.

Geological survey

Gological survey helps in the study of earth composition. It helps to determine the arrangement of different strata on the earth.

Archaeological survey

This type of survey gives the details about old antiquity, forts etc to understand the archaeological sites.

Classification of surveying based on instruments

Chain surveying

Chain surveying is the simplest form of surveying. The principle of chain surveying is triangulation. In this surveying method, we only measure linear measurements. Also, it is suitable for small areas. The areas are divided into triangles and the sides of the triangles are measured. The chain surveying uses instruments such as chains, arrows, pegs, ranging rods, etc.

Theodolite surveying

Theodolite is a surveying instrument that measures horizontal and vertical angles. It is one of the precise methods of surveying. This type of surveying helps to find the level difference, setting out, prolonging survey lines, etc of the area.

Theodolite survey - Classification of Surveying
Theodolite Survey

Also Read : Total station – Principles and fundamentals

Traverse survey

Traverse surveying is a type of surveying in which we connect the survey lines to form a framework. The length can be measured either using the directly or indirectly method. So for the direct method of measurement, we use tapes. For the indirect method, we use Electronic Distance measurement. Some important traversing methods are Chain traversing, Chain and compass traversing, Tape traversing and plane table traversing.

Triangulation survey

In triangulation surveying, we trace series of triangles formed by joining the survey points. The distance and relative points are calculated by the trigonometric relations between the length and angles of the triangle. It is preferable for hills and undulating areas. 

Tacheometric survey

Taacheometric surveying is angular surveying in which horizontal and vertical distance are calculated from the angular measurements. It is a convenient surveying method. Tacheometric surveying uses transit theodolite with a stadia diaphragm for taking measurements. This method is preferable when a direct method of surveying is not possible. 

Plane table survey

Plane table surveying is one of the fastest methods of surveying. It is a graphical method in which we can do field observation and plot simultaneously. Mostly preferable in magnetic areas where compass surveying is not possible. Also, we can check errors and mistakes using check lines. The instruments for plane table surveying are plane table, alidade, plumbing fork, plumb bob, spirit level, compass, etc. 

Photogrammetric survey

It is a surveying type that uses photographs for making measurements. We can prepare maps, 3d diagrams from these photographs. These are mostly to study the wide life and to make virtual models of historical structures. Photogrammetric surveys cover a large area for surveying and they are less time-consuming.