The bitumen softening Point Test is done to determine the consistency of bitumen. Bitumen is a viscoelastic material, which means it behaves like both a liquid and a solid state. It does not have a specific melting point. As the temperature increases, the bitumen becomes softer and the viscosity of the bitumen decreases. One of the common parameters for classifying bitumen is the softening point of the bitumen. This property shows at what temperature the bitumen softens.
Bitumen Softening Point Test
Bitumen softening point is measured in different ways such as:
Ring and Ball Method (R&B)
Krämer-Sarnow Method (KS)
Mettler Softening Point Method
Capillary Method
Flow Point Method
Drop Point Method
The ring and Ball method is the most frequently used to determine the softening point of bitumen.
Bitumen roads
Why Is The Bitumen Softening Point Important?
To pave the roads and aeroplane runways, it is necessary to use a type of bitumen that has a specific degree of softness. Choosing a suitable bitumen with a good softening point depends on the weather condition and traffic loads.
For example, if the average temperature in a region is high during a year, bitumen with a higher softening point should be used to make asphalt pavement. If during the year, the number of vehicles crossing this road is high and they put a lot of pressure on the road surface, more bitumen should be used in the asphalt. This work increases the strength of the asphalt.
International Standard Methods of softening point test
The softening point test of bitumen is in the accordance with the following standards:
ASTM D36
ASTM E28-67/E28-99
ASTM D6493 – 11
IS 1205
EN 1427
IP 58
ISO 4625
JIS K 6863
The most common standard method for determining the softening point of bitumen is ASTM D36, which we will discuss further. You can see the steps of the Ring and ball method through the Video produced by the Infinity Galaxy team.
Softening point test of bitumen – Ring and ball method (Video)
Youtube video
Softening Point Test Procedure
The ring and ball method is widely used to determine the softening point of bitumen. In the infographic below, you can see a summary of the bitumen softening point test:
Softening point test procedure
The required equipment to do the bitumen softening point test are:
Two steel balls
Two brass rings
Beaker
Thermometer
Heater
Knife
A glass surface
Bitumen
The bases holding the rings
Bitumen Softening Point Test Steps:
In the first step, it is necessary to prepare the test sample. Heat the bitumen to a temperature between 75 and 100 °C. Stir the bitumen well until it becomes completely liquid and free of air and water bubbles. Heat the rings to the approximate temperature of the bitumen. Prepare a mixture of glycerin and dextrin in equal proportions.
Cover the surface of the metal or glass plate with it. Pour the heated bitumen into the rings to fill them. After cooling in the air, it is necessary to draw the extra bitumen with a heated knife at an angle of 45 degrees on the surface of the rings. So far you have understood how to prepare the sample. In the following, we will explain the process of conducting this test.
Place the rings filled with bitumen on the bases and place them in a water bath with a temperature of 5 °C for 15 minutes. Cool the steel balls to a temperature of 5 °C. Put them in the beaker and fill them with distilled water up to about 50 mm above the rings. Now place the steel ball in the centre of the ring and tangent to the bitumen and heat it until the temperature rises 5±0.5 °C/min.
Ring and ball method – Results
As the temperature increases, the bituminous material softens and the balls sink through the rings. Continue heating until the balls on the bitumen reach the surface of the metal blade under the rings and note the temperature when each of the balls contacts the bottom of the plate. Consider the average of the two temperatures obtained as the bitumen softening point.
An important point in this experiment is the process of heating the beaker and its contents, i.e. bitumen. Since this test is very sensitive to heat, it is necessary to use the same heating rate throughout the test. It should be noted that if the bitumen is blown and hard, glycerin liquid is used instead of water.
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
Types of foundations – How to decide?
Deciding the size and types of foundations
Safe bearing capacity
Types of foundations
Shallow foundations
Types of foundations – Shallow foundations
Spread footing or isolated footing
Simple spread footing
Sloped spread footing
Stepped spread footing
Strip footing
Combined footing
Strap footing
Types of foundations – Raft foundation /Mat foundation
Types of foundations – Deep foundations
Pile foundations
Basement foundations
Caissons foundation
Hollow box foundations or Buoyancy foundations
Drilled shaft foundation
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.
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
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
Stepped spread footing
When the loads are heavy, steps are provided in the footings, as shown in the figure.
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.
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
Foundation type-Rectangular Combined Footing
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
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
For more information on a raft foundation, please see our blog
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.
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.
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.
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
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.
Raft foundation is a continuous slab that completely covers the entire site of the proposed structure and rests on the soil. Depending on the applications and design loads, there are various raft foundation types. The choice of raft foundation type is influenced by a number of variables, including bearing capacity, loads, site circumstances, etc.
Raft foundation – Definition
A raft foundation or mat foundation is a solid slab that is put at a predetermined depth and covers the entire structure. Raft foundations have shear walls and columns for distributing loads to the ground. These foundations are appropriate for places with low bearing capacity, wherein individual footings struggle to traverse the stresses. Moreover, the raft foundation aids in the transfer of the structure’s total load to a larger area. In comparison to other forms of foundations used in civil construction, raft foundations can minimize soil stress levels. This mechanism of stress distribution distinguishes raft foundations from other types of foundations.
Raft foundation
Determining soil stress
Stress = total load acting on the structure + raft self weight / raft foundation area
Assume a total load of 300 T and a foundation size of 20 m x 10 m
Soil stress = 300/200 = 1.5 t/sqm
The same structure is supported by 8 separate footings. 2 x 2 mtr 8 x 4 = 32 sqm total space
Soil stress = 300/32 = 9.375 t/sqm
This demonstrates that for the same weight, we get stresses of 1.5 T/sqm for the raft and 9.375 T/sqm for the individual foundations.
Because the raft’s contact area is greater, the load is distributed across a larger region, resulting in less stress on the soil.
Raft foundations – Where to use them?
When the following circumstances exist, these foundations are typically favoured over other foundation types.
When the bearing capacity of the soil is extremely low, building individual footings and executing deep foundations such as pile foundations becomes prohibitively expensive.
When soil stresses must be reduced since the soil’s bearing capacity is lower.
The columns, shear walls, and so on are so close to each other that individual footings may overlap.
Any other type of foundation may cover more than 50% of the total ground area beneath the structure.
When there is a possibility of unequal settlement.
Likewise, Raft foundations are Preferred for complex equipment foundations.
When the proposed structure has basements, raft foundations are preferred
For basement constructions where the foundation slabs would be subjected to direct live loads raft foundations are preferred based on the utility of the structure. Raft foundations are also a preferable option for sites where soil conditions are poor and access to major excavation machinery is limited, wherein raft foundations excavations can be accomplished with the help of light excavators.
Raft foundations are classified into several types based on soil conditions, structure functionality, and so on. The following are some of the most popular raft foundation types used in civil construction.
Solid Slab Raft foundation/ Flat plate type foundations
Slab beam Raft foundation
Piled Raft Foundation
Cellular raft foundation
Balancing or floating raft foundation
Solid Slab Raft Foundations
Flat plate raft foundations are made up of a reinforced concrete slab of uniform thickness covering the entire bearing area. In this type of raft foundation, the columns and walls are equally spaced, and the load distribution is also equal.
These raft foundations are known as solid slab raft foundations because they are designed as slabs with uniform thickness. This is ideal when the columns are evenly spaced and have equal and minor weights. Steel mesh reinforcement is offered in both directions of the slab. Two meshes are reinforced at the top and bottom of the slab to balance upward and downward bending stresses.
Solid slab raft foundation
The following are the various types of solid slab raft foundations that are commonly used based on design requirements.
Thickened flat plate type raft foundation
Wide toe raft foundations
Blanket rafts
Slip plane raft foundations
Thickened flat plate type raft foundations
When the column loads are extremely heavy, the flat plate type foundation is inadequate. To make it suitable, the slab thickness must be increased. The substantial loads on the column cause negative bending moments and diagonal shear in the slab. A full-size solid slab mat base is not required to negotiate the design loads. To compensate, a section of the slab beneath the column should be thickened. The placement of a pedestal beneath the column without increasing the slab thickness also assists in receiving heavy loads.
Wide toe raft foundations
A wide toe raft is used when the ground conditions require an unusually thick concrete slab to provide the necessary load support, which would be quite expensive. For negotiating the design loads, a full-size solid slab mat base is not necessary. A substantially reinforced toe is provided on both sides of the structure, as illustrated in the image, for economizing the structure.
Wide toe raft foundation
Blanket raft foundations
When the construction site comprises small areas of weaker soil or diverse soil types with unequal settlements or nonuniform strata, a blanket raft may be the best option. Before laying the raft foundation, the surface is compacted and stone blankets are spread in layers on the prepared ground, as shown in the figure. However, despite the build’s footprint’s flaws, the raft foundation and stone blanket work together to provide even load support.
Blanket rafts
Slip plane raft foundations
A preliminary layer of sand is put across a slightly larger surface than the required raft foundation for slip plane rafts, and the gap around the raft is filled with packed material. A thoroughly compacted sand bed supports this type of foundation beneath the raft. The foundation’s sides can be filled with any compressible material.
Slip plane
Slab beam type raft foundations
When the loads are unequally distributed, there seems to be a lot of space between the columns, and the foundation is susceptible to distortions, slab beam raft foundations are preferred. Beams are set in perpendicular directions in this scenario, and they are all connected by a raft slab. The beams incorporated with the slab act as stiffeners and prevent distortions. Columns are precisely located on the intersections of raft foundation beams, as illustrated in the figure. The raft’s reinforcement consists of two mesh layers, one at the bottom and one at the top.
slab beam raft
Piled raft foundation
Pile foundations are used to support the slab in the case of piled raft foundations. When the loads on the structure are exceedingly high, the soil bearing capacity is very low, and the water table is exceptionally high, this method is commonly used. Piled raft foundations are ideal for high-rise buildings and large industrial structures such as high-rise RCC chimneys, silos, and storage tanks that are typically supported by a single foundation element. Because of their exorbitant costs, these foundations are not generally used in residential applications. Designing a very heavy raft foundation or a very conservative pile foundation with greater depths is avoided by using a piled raft. Instead, they opt for a hybrid of an optimal raft foundation and a pile foundation capable of supporting the structural loads.
Piled raft foundation
Cellular raft foundation
A cellular raft is made up of two-way foundation beams with a solid slab lying on the ground below and a suspended slab on top. Between the upper and lower slabs, intermediate beams are provided. The intermediate beam is responsible for transforming the entire structure into an I Beam. The top slab is cast using precast soffits or various types of permanent formwork, sacrificial formwork, or lightweight infill blocks. Cellular raft foundations are often used in areas with significant mining activity and poor soil carrying capacity, where the foundations must withstand huge bending moments. These types of raft foundations are used when eliminating overburdens resulting in greater bearing capacity. Moreover, cellular rafts can be used to control soil uplift pressure.
Cellular raft foundation
Balancing raft or Floating Raft Foundation
Balancing rafts or floating foundations are deployed in situations where the soil bearing capacity is very low and the soil settlements must be kept within an acceptable range.
The floating foundation operates on the idea that the total weight of the earth and water removed from the excavated area must equal the weight of the planned structure.
This process involves huge earthwork excavation. Dewatering systems like well point systems have to be provided when the water table is very high. Likewise, Sheet piles are to be installed for weak soils or soils that may collapse. To protect the nearby structures from any defects due to scoring of soil, temporary retaining walls etc. have to be organized before starting excavation and some of these activities have to go in tandem with excavation. This type of structure is not economical and requires very minute technical supervision.
These foundation types are used for building structures in highly dense areas following all safety precautions to avoid any damage to the nearby structures.
Floating rafts are preferred for building with multiple levels of underground car parking facilities. However, for more details about floating rafts, you can go through our detailed article Balancing rafts or floating raft foundations
Raft foundations offer a safe and cost-effective alternative to conventional shallow and deep foundation types.
Preferable in areas with low soil bearing capacity, uneven settlement, and the presence of mixed soil types. By distributing stresses across a larger area, these foundations are able to achieve load-bearing capacity.
Used in congested metropolitan locations where access to sites is limited and heavy machinery mobilisation for foundation construction using conventional deep foundations, such as pile foundations, is not feasible.
Raft foundations can be built using very light machinery due to their low heights.
Raft foundations offer designers a much-needed alternative to conventional isolated foundations for limiting the settlement restrictions within the codal provisions.
When compared to regular foundations, the designers have the option of choosing larger settlement values during the design process in the case of raft foundations. Moreover this in turn can avoid an unequal settlement.
Got flexible design alternatives that can be customized as per soil conditions and workability.
Comparatively speaking, the execution is simpler than individual footings. This, in turn, can accelerate the project schedule.
Disadvantages of raft foundations
In extremely poor soil conditions, raft foundations are not cost-effective.
Complex raft foundations demand careful professional/technical supervision and workmanship and consume a substantial amount of concrete, and steel. As a result, the structure is more expensive than any other alternative foundation.
The soil beneath the foundation, particularly around the margins, must be protected. Edge erosion is common in raft foundations.
When the soil conditions are extremely poor, pile foundations are more cost-effective than raft foundations.
Raft foundations occasionally need further strengthening, which raises the overall cost.
Compared to other foundations, skilled labour is needed for raft foundations.
When the mat or raft foundation is under the concentrated(point) load, further care should be taken.
The types of culverts to be deployed depends on the site conditions and the purpose of the culvert. Culverts are tunnel structures constructed beneath rail tracks or roadways to facilitate cross drainage or to convey electrical cables from one side to the other. It is completely encircled by ground or soil. Pipe, box, and arch culverts are the most common types of culverts deployed under roadways and railroads. They should run parallel to the ground. The culverts protect the road from erosive forces and other water-related concerns. Hydraulic, water surface elevation, roadway height, and other parameters influence culvert designs. Moreover, culverts are used to regulate the flow of water.
This article is about the meaning of culverts, the types of culverts, and their advantages.
What are culverts?
A culvert is a permanent or temporary structure that enables water to flow beneath a road or railroad. It is best suited for locations where roads or railroads need to be built near existing rivers or canals without interfering with water movement. Generally, the length of the culvert should be 6 meters or less. As a result, they are quite large. Concrete, aluminium, and steel are among the materials used in the culvert’s construction. However, the material choice is influenced by criteria such as hydraulic efficiency, strength, cost, and installation technique. Concrete is preferred for culverts due to its strength and durability. Moreover, they are also more resistant to highly corrosive conditions.
Culverts are similar to pipes but much larger in size. They are manufactured from a variety of materials, like
Concrete
Steel
Plastic
Aluminium
high-density polyethene
Culverts made of concrete are typically preferred. Concrete culverts can either be reinforced or unreinforced. Culverts that are built on-site are known as cast-in-situ culverts. Precast culverts, which can be manufactured elsewhere, transported, and assembled on-site, are another possibility.
The aforementioned materials can be combined to create composite culvert types.
There are numerous varieties of culverts. The amount of water, the elevation of the road, the site’s condition, the area of water release, etc. are all taken into consideration while choosing the size and type of the culvert.
Most used culvert types are as follows
Pipe Culvert
Pipe Arc Culvert
Box Culvert
Arch Culvert
Bridge Culvert/Slab culvert
Metal Box Culvert
Pipe culverts
A culvert is a covered hydraulic structure that conveys fluid. Pipe culverts are constructed by inserting a pipe into an excavated trench to convey water away. It is the most frequently used drainage system. Pipe-type culverts are fairly prevalent due to their economical cost and ease of installation. In terms of hydraulic performance, the round section is the best geometrical section. Pipe culverts, on the other hand, come in a variety of shapes, including elliptical, pipe arch, and others. In general, the shape of the culvert is governed by site constraints and conditions. The culverts could be single or multiple. For comparatively small discharges, circular precast concrete pipes and ductile iron pipes are commonly used.
pipe culverts
Pipe Arch Culverts
Arch culverts are semi-circular in shape. They are appropriate for larger waterway openings with steady water flows wherein fish can benefit from a greater hydraulic advantage. however, need to provide a steady water flow. Fish or sewage in the drainage is easily moved to the outflow due to the arch shape, as there is no stocking at the intake or bottom of the channel. Depending on the need, this type of culvert can also be provided in multiple numbers. Additionally, they offer little clearance and are undoubtedly quite artistic. Pipe arches have a hydraulic advantage at low flows and are particularly beneficial for locations with limited headroom. The main advantages of pipe arch culverts are their light weight and ease of installation.
These culverts are used for intakes and outtakes, holding tanks, steam tunnels, corridor linkages, road crossings, service tunnels, and utility trenches. They are one of the most useful structures in modern construction and are common components in road and highway construction. These box culverts allow water to flow beneath roads and highways without interfering with traffic flow and serve as alternate animal crossings. Box culverts are rectangular or square in design, and they must be sturdy to endure traffic loads and harsh weather conditions. Because of this box culverts are constructed using Reinforced cement concrete. The most difficult aspect of building a box culvert is that it must be installed in a dry area with a firm base.
When a significant amount of water is anticipated, the strength of the concrete floor allows for a shift in the water flow direction. Box culvert may also be of the precast type. Circular concrete pipes are replaced by precast concrete box culverts. They have higher strength, can easily withstand greater water flow than standard pipes, and can drain extremely huge amounts of water. Box culvert installation is simpler and more practical than other types of culverts.
Precast box culvert can be prepared in advance, and then installed in the locations required when the time comes.
Arch Culvert
An arch culvert is constructed of metal, stone masonry, concrete, RCC, and other materials. Arch culverts are similar to pipe arch culverts, except in this instance an artificial floor is constructed underneath the arch. The arch culvert demands the construction of a superstructure, that comprises one or two segmental arches. It is frequently used for narrow passages. Contrary to box culverts, installation can be completed quickly and without disrupting the flow of the water, therefore water diversion is not necessary. The natural integrity of the wash bed is preserved by this type of culvert.
arch culvert
Similar to masonry bridges, arch culverts are economical, fast, and easy to construct. They benefit from the design-build advantage and improved hydraulic effectiveness. The arch culvert is also made of steel but it is very extortionate. The arch culverts are not provided with the piers to the sides of the abutment
Slab culvert/Bridge Culvert
Bridge culvert
Bridge culverts are generally constructed on rivers and canals. They are also used as vehicle bridges. As a result, it is referred to as a multi-purpose culvert. Most foundations are built below the surface of the ground. A number of culverts are installed, and then a pavement surface is placed on top of them. Slab culverts and bridge culverts may have three sides or may just be flat slabs. Both sides of it are buried in the ground. These culverts, which are typically rectangular in shape, can take the place of box culverts if artificial flooring is not required. The typical span length is between 8′ and 48′. Being able to accommodate traffic on it, being the most expensive river crossing, being extremely sturdy, and got a very strong foundation.
The benefits of a bridge culvert are that it allows traffic to travel through it, it is the most expensive river crossing, it is very strong, and it has a very strong base. Because slab culverts don’t have bottom slabs, the normal flow of water is maintained, and the natural bottom substrate remains undisturbed. The slab culvert is safe for high-velocity vehicles because it has no sharp corners.
Metal Culvert
Metal culvert
The metal box culvert is an economical alternative to bridges. These bridges are made of conventional structural plates or deep-corrugated structural plates. They are the ideal bridge replacement since they keep the same road grade level. Construction of a metal box culvert requires little time and is relatively easy to install. They are more durable and have a longer service life.
For projects that need larger diameter pipe than what Metal Culverts can manufacture (more than 144′′ diameters), Structural Plate and Aluminum box Culverts are ideal. This solution enables quick and simple installation at a fraction of the price and time that replacing a steel bridge would cost. Aluminium box culverts and structural plates are available for use in various applications, such as small bridge replacements, pedestrian passages, livestock underpasses, and stream enclosures. Structural Plate’s shape also helps maintain the natural environment in which pipes are installed. The arch shape allows wildlife to pass through without difficulty and can also leave natural stream beds intact.
The Construction drawings for a house are the most important document in home-building. It contains instructions on how to construct your new house or add-on, which contractors to hire, and how they should do their job.
A blueprint is an overview of the entire construction project photographed from above. It means that all of the construction drawings for your building will be contained within a single blueprint sheet, making it easy to follow along with what’s happening during various stages of construction. A blueprint sheet will have a lot of information.
Each scale drawing has a title, starting with the plan, the number, and name of the architect, scale measurements, and legal description of the property. You will also see different scale drawings.
Different Types Of Assembly Drawings
There are many types of assembly drawings. They include foundation, tanking and foundation cut-always, crawl space and slab information, parapet wall, and roof details. Foundation drawings are required for new construction, additions, and modifications to existing structures. It shows all the walls, floor supports, and footings used to support the house’s floors, structures, and external components.
1. Standard Assembly Drawings –
These drawings are a set of drawings that show how to put the parts together. It establishes a basis for construction and design. The main elements are framing, sheets, lumber, blocking, and trim/molding materials.
2. Outline Assembly Drawings –
A preliminary set of drawings establishes the general appearance of the work.
3. Detail Assembly Drawings –
It provides more detail on construction details such as existing and proposed walls, ceilings, and other finishes.
4. Assembly Working Drawings –
The drawings show the construction process and include foundation details of the framing, floors, cabinets, and stairs.
5. Tabular Drawings –
It contains all the information needed to construct the project. They are usually kept in a text file or spreadsheet and give you information on the actual sizes, quantities, and room locations.
6. Diagram Drawings –
Diagram drawings are simple drawings of a floor plan and elevation drawings that show how any given elements work to create the project’s design.
All structural elements of the building must be drawn in detail, anticipating all expected loads on the structure. These details must also include all internal and external spaces within the new building, anticipate potential problems, and propose solutions.
Structural drawings are the blueprints of the construction sheets: they show all structure elements, including beams and columns, walls, and flooring. It is a series of symbols and lines that illustrate any load-bearing or non-load-bearing walls. Sustainable cities and constructions of the future require high-quality structural drawings.
What Are The Major Inclusions Of Assembly Drawings?
Building plans include a profile view of your house, including the side elevations or front and rear views. In addition, the plan sets out the orientation of your house, inside to outside. When reading a structural drawing, you need to understand that there are many different kinds of assemblies. However, there are three basic types of structurally significant assemblies: frame, floor, and roof.
A-frame assembly comprises a top plate, bottom plate, and posts. The basic elements of an assembly are the post. These are angled beams that are attached to foundation walls, floors, or exterior walls.
The landfills and roof beams are considered as frame assemblies. They include facets such as posts, beams, headers, and joists or wooden floorboards. The next assembly is a floor assembly. It is a structural system that supports the weight of all upper floors and roofs.
The roof assembly is the third major structural assembly. It consists of a top and bottom chord, common rafters, collar ties, or trusses.
The Importance Of Construction drawing In Designing A Building
Scope of construction –
Construction drawings are all about explaining and showing the finished product. The job is to document and view the construction process. That’s why structural engineers design the building, show their drawings, and then give their clients a set of construction drawings.
Importance of construction drawing
The drawing is about the design and the assembly of everything working together for a living space, so you need to be able to tell more than one story. It deserves a lot of attention.
Staff size –
It is a big job, and they usually work with several people who help them draw the design and then give the construction drawings to the client.
Provides information –
It involves many people who have to provide a lot of information. This information should be precise and clear, as it is about planning for the future.
Safety –
It plays an important role in the design and construction process to ensure the safe construction of the building.
How To Produce A Construction Drawing
There are many ways to make construction drawings. Today’s most common ways workers use photo plotting, CAD (Computer Assisted Drawing), and hand drafting. CAD is an advanced technology, and using it is quite easy. India CAD works enable you to make construction drawings with ease. You can create as many construction drawings as possible and share them with your clients. Many construction companies use it to execute their projects and make best-selling construction drawings for their clients. With CAD, you can create various drawings, from simple to complex. You can design and add any number of view layers and color them in any way you like.
Sustainable Waste Management has become the need of the hour with the ever-increasing amount of garbage that humans generate. According to the United Nations, around 11.2 billion tonnes of solid garbage are collected worldwide, with humans accounting for nearly all of it. As a result, we must devise plans for long-term sustainable waste management.
In this blog, we will discuss the importance of sustainable waste management, its importance as well as the ways of doing so. Let’s get started with the definition of sustainable waste management.
What is Sustainable Waste Management?
Sustainable waste management refers to the collection, transportation, valuation, and disposal of different types of garbage in a manner that does not damage the environment, human health, or future generations. It encompasses all activities involved in waste management, from production to final treatment.
Sustainable waste management aims to limit the amount of natural resources utilised by
reusing as much natural materials as possible
producing as little garbage as possible.
A well-functioning sustainable waste management system should have feedback loops, a process-oriented approach, adaptability, and methods for waste diversion. It is critical to adhere to environmental sustainability in this regard so that we can manage all the garbage efficiently rather than dumping it in landfills.
Let’s have a look at the importance of sustainable waste management and what makes it an attractive option.
Creates space
In the absence of a proper waste management system, garbage will end up on land, either scattered or centralised in a landfill. Landfills are large structures that take up a lot of space. Densely populated cities can’t afford a lot of space for the sake of landfills.
Sustainable waste management Saves and also makes money
Recycling more can help us save money since we will not need to buy another identical item once we have reused or recycled it. Sustainable waste management, in line with the concept of money, can assist some businesses in generating revenue.
Municipalities that collect garbage, for example, might charge collection and recycling fees, gaining money in the process. This will also deter institutions that generate a lot of waste, making them more sustainable and environmentally conscious.
Prevents Pollution
Each type of rubbish we dump has a unique impact on the ecosystem. Pharmaceutical waste, for example, contaminates our water, and discarded meals attract flies and rodents. To avoid this, we should return pharmaceutical waste to the manufacturer for proper disposals, such as burning. Food waste can be sent for composting and plastics for recycling.
All of these measures, as well as others, will aid in pollution control. As a result, pharmaceutical waste won’t pollute the water, plastics won’t block marine life, and food waste won’t attract mice. Sustainable waste management enables us to better understand our garbage and how to manage it.
Waste Management Hierarchy in Sustainable Waste Management
The waste management hierarchy is the foundation for sustainable waste management. It focuses on
Avoidance
Reduction
Reuse and recycle
Energy recovery
Treatment or disposal
Its goal is to prioritise behaviours that maximise resource efficiency, with renewable and less wasteful methods at the top of the pyramid. We’ll look at how the waste management hierarchy is crucial to long-term waste management in the upcoming section.
Reduction and avoidance
The primary aim is to avoid and reduce the amount of waste produced. This can be accomplished by increasing efficiency while lowering consumption. To begin with, businesses and consumers should select products that take the least amount of resources to manufacture including the packaging.
Additionally, wherever possible, we should abstain from using single-use or disposable commodities. These materials form the core of linear waste, in which resources are harvested, processed, and redistributed only to be discarded.
3R concept
Reuse and Recycle
If we cannot avoid the consumption of a product then we should choose things that are reusable. Also, we should promote awareness on how to reuse waste products. Processing new materials require money, energy, and often other resources. Since reusing helps us to save these resources, we prefer it over solutions lower down the hierarchy.
One of the core aspects of the zero-waste concept is reuse, which can take the form of having shoes repaired, giving clothes and objects for others to use, and even finding recipes for food leftovers rather than tossing them away. If an object cannot be reused, recycling is the next best choice.
Recycling is suitable for materials that have reached the end of their usable life in their existing form. It minimises the need to extract virgin resources and mitigates some of the negative consequences of waste disposal. Recycling is less desirable than reusing and reducing because it needs more energy, money, and resources to convert the garbage into useable products.
Energy Recovery
Energy recovery is the next stage, which involves converting waste into useable heat, power, or fuel, such as biogas. This is accomplished using a variety of techniques such as
Incineration (with energy recovery),
Gasification
Pyrolysis
Anaerobic digestion
Landfill gas (LFG) recovery
Combustion is a typical technique of energy recovery for non-hazardous waste. and while it is less favourable to reuse or recycle, it helps lower the physical volume of waste transported to landfills and also produces energy from the burning process that would otherwise require fossil fuels.
Treatment or Disposal
Treatment or disposal is the final and least desirable step in the hierarchy. This usually refers to landfills or incinerators that do not recover energy. Some waste demands treatment but we should avoid it as much as possible by using sustainable waste management techniques.
Sustainable Waste Management Solutions
What criteria must professionals and citizens use to decide if waste management procedures are “sustainable?”
Fundamentally, building a circular economy of waste, as opposed to the make-use-dispose paradigm, is crucial to sustainable waste management. In a circular economy of waste, it returns as a new product or source of energy in a sustainable manner.
Solutions for long-term waste management include:
Composting
Composting is a green and environmentally friendly technique to dispose of waste. Common household items that can undergo composting include excess fruits, tea bags, eggshells, coffee filters, etc. Since it will nourish the soil, the compost pit will be an excellent addition to your workplace or home garden.
To keep odours and fruit flies at bay, tightly close the composting bin or bag. In general, composting converts and recovers organic matter into stable, sanitary, and soil-like products that are high in humic chemicals that replenish the soil.
composting
Avoid Single-use products
We must promote reusable products instead of single-use ones. Get mugs or glasses instead of cardboard coffee cups. Even at professional composting facilities, many supposedly green things, such as compostable coffee cups, don’t undergo composting. They eventually end up in landfills. If we can switch to a greener option like glass which we can reuse and recycle it could save both the environment and money.
Make the switch to digital.
Paper and paper products account for the majority of Municipal Solid Waste. Switching as much paperwork as possible to digital forms is a simple strategy for organisations to improve sustainable waste management. This includes
Sending and receiving bills electronically rather than in paper
Keeping meeting minutes in a shared document rather than printing them
Converting to online banking
Conclusion
If the correct framework is in place, waste management can be sustainable in both enterprises and homes. But, more importantly, the implications of ignoring waste are just too serious to ignore. So, let us join our hands to manage waste, adopt sustainable waste management solutions into our day to day life and convert waste into a resource.
