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What is Soundness Property of Cement?
Tips_and_tricks
The soundness property is related to the cement in the concrete. Soundness is the property of cement to retain its volume after setting. There should not be any expansion in the cement. The volume change in the cement may be caused by excess amounts of lime, magnesium and calcium sulphate. SoundnesRead more
The soundness property is related to the cement in the concrete.
Soundness is the property of cement to retain its volume after setting. There should not be any expansion in the cement. The volume change in the cement may be caused by excess amounts of lime, magnesium and calcium sulphate.
Soundness of cement can be tested using the Le’- Chateliers’s Experiment, where the maximum expansion of the cement can be 10 mm.
See lessWhat is double R.C. beam?
Tips_and_tricks
Double Reinforced beam or doubly reinforced beam is the beam having reinforcements both the bottom and top. The singly reinforced beam has tension reinforcements placed only at the bottom of the beam. In a singly reinforced beam, tension is carried by steel, and compression is carried by the concretRead more
Double Reinforced beam or doubly reinforced beam is the beam having reinforcements both the bottom and top.
The singly reinforced beam has tension reinforcements placed only at the bottom of the beam. In a singly reinforced beam, tension is carried by steel, and compression is carried by the concrete.
In doubly reinforced beams, tension reinforcements are provided at the bottom and the compression reinforcements are provided at the top. This type of beam is mostly used when the depth of the beam is restricted.
See lessWhich size of aggregate used in RCC structure?
Tips_and_tricks
In IS 456: 2000, As per Cl 5.3.3 For most works, 20 mm aggregate is suitable When there is no restriction to the flow of concrete, 40 mm or larger aggregate is preferred. In thin sections, small cover or closely-spaced reinforcements, considerations should be given to use 10 mm aggregate. As per ClRead more
In IS 456: 2000,
As per Cl 5.3.3
As per Cl 5.3.3.1
See lessWhat is the diffrence between lap length and development length?
Tips_and_tricks
Lap length: The reinforcement bars come in certain lengths. This length may not be sufficient. For example, In tall buildings, there may arise a situation where the length of the rebar in the column may not be sufficient. To meet the need, we will have to overlap the existing rebar with a new one. TRead more
Lap length:
The reinforcement bars come in certain lengths. This length may not be sufficient.
For example,
In tall buildings, there may arise a situation where the length of the rebar in the column may not be sufficient. To meet the need, we will have to overlap the existing rebar with a new one. The length to which they are overlapped is called Lap length. Lap length should be provided in such a way that the load is transferred safely to the new bar. Here transfer is from steel to steel.
Development length:
The bond between steel and concrete is very crucial for the performance of a structure. The length of a member required to develop the full bond is called the anchorage length. The bond is measured by bond stress. In the above diagram, you can see the difference between a beam with and without development length.
See lessWhat is the best answer for ”Why did you choose Civil Engineer?
Tips_and_tricks
My answer would be, "Food, clothes, and shelter are the basic necessities of mankind. Civil engineering provides one of the three basic necessities. I also chose civil engineering because it is the most practical branch of civil engineering. It gives life to the drawings. The satisfaction of lookingRead more
My answer would be, “Food, clothes, and shelter are the basic necessities of mankind. Civil engineering provides one of the three basic necessities. I also chose civil engineering because it is the most practical branch of civil engineering. It gives life to the drawings. The satisfaction of looking at your drawings and designs getting life and standing up tall can not be compared to any other form of pleasure!”
See lessHow size of aggregate affect on strength of concrete?
Tips_and_tricks
The size of the aggregate plays a crucial role in the strength of the concrete. Normally, small-sized aggregates are preferred. Larger sized aggregate reduces the strength of the concrete. This is because of the Interfacial Transition Zone (ITZ). The interfacial transition zone is the zone that is fRead more
The size of the aggregate plays a crucial role in the strength of the concrete. Normally, small-sized aggregates are preferred. Larger sized aggregate reduces the strength of the concrete. This is because of the Interfacial Transition Zone (ITZ).
The interfacial transition zone is the zone that is formed on the surface of the aggregates. When concrete is mixed, the water present in the mix coats itself on the surface of the aggregates. This thin film results in a high water-cement ratio in the vicinity of the aggregates.
Owing to the high w/c ratio, during hydration reaction, a rather porous network is formed, resulting in a weaker section surrounding the aggregates. However, as the hydration reaction proceeds, the second generation hydration gels are produced, making the zone denser but still comparatively weaker than the rest of the concrete.
This happens in all sized aggregates. But as the size of the aggregate increases, the surface area of the aggregate also increases. As a result, the ITZ increases, making the concrete weak.
See lessWho have higher modulus of elasticity rubber or steel
Tips_and_tricks
Steel has a higher modulus of elasticity than a rubber. We know that Young’s modulus is the ratio of stress to the strain. Therefore it is a property of cross-sectional area, length, and applied load. Taking two samples of steel and rubber of the same cross-sectional area and length, if we apply theRead more
Steel has a higher modulus of elasticity than a rubber. We know that Young’s modulus is the ratio of stress to the strain.
Therefore it is a property of cross-sectional area, length, and applied load.
Taking two samples of steel and rubber of the same cross-sectional area and length, if we apply the same load, the following observation can be made:
This implies that the modulus of elasticity of steel is greater than that of rubber.
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See less