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What should be the standard Roof height?
CB Sowmya
The ceiling height of residential buildings is generally 3 m. However, the minimum height requirements as per the National Building Code are as follows You can find more about it in this link below: https://theconstructor.org/building/rooms-minimum-height-size-standards/5116/ The ceiling heigRead more
The ceiling height of residential buildings is generally 3 m. However, the minimum height requirements as per the National Building Code are as follows
You can find more about it in this link below:
https://theconstructor.org/building/rooms-minimum-height-size-standards/5116/
The ceiling height of public and industrial buildings are larger than residential buildings, due to various reasons like the people traffic, ventilation purposes and for easy operation in case of industries.
The minimum height of public buildings and industrial buildings is 3.6m.
See lessWhat is the reason for micro cracks in concrete?
CB Sowmya
The reason why micro-cracks occur in concrete even before loading is because of the Interfacial Transition Zone. The interfacial transition zone is the weakest link in the concrete. It is caused by the formation of a water film around the aggregate surface. When concrete is mixed, the water forms aRead more
The reason why micro-cracks occur in concrete even before loading is because of the Interfacial Transition Zone.
The interfacial transition zone is the weakest link in the concrete. It is caused by the formation of a water film around the aggregate surface. When concrete is mixed, the water forms a film around the aggregate, and as a result, the water-cement ratio near that aggregate increases. A high water-cement ratio means less strength.
This water film hinders the hydration reaction and results in a porous network of hydrated products. This porous network is much weaker than the bulk mortar. Therefore, even small changes in temperature cause differential movement of the material in the concrete. Differential movement occurs due to the difference in the porosity of the hydrated products.
As a result, the micro-cracks are formed. They are formed even without the application of loads.
Thanks
See lessWhat is meant by Dry Shrinkage?
CB Sowmya
Dry shrinkage or drying shrinkage occurs due to loss of moisture in the concrete. There are different types of water in a hydrated cement paste. Dry shrinkage occurs due to the loss of capillary water. This water can be found in voids of sizes ranging from 5 nm to 50 nm in the hydrated cement paste.Read more
Dry shrinkage or drying shrinkage occurs due to loss of moisture in the concrete. There are different types of water in a hydrated cement paste. Dry shrinkage occurs due to the loss of capillary water.
This water can be found in voids of sizes ranging from 5 nm to 50 nm in the hydrated cement paste. Due to the small size of the voids, the water is held inside by surface tension or capillary tension. Due to the bond created by the surface tension, evaporation, or any other form of removal of this water causes significant volume changes to the structure. This volume changes causes dry shrinkage to the structure.
Thanks!
See lessWhy does modulus of elasticity of concrete reduce with time?
CB Sowmya
The Modulus of Elasticity reduces with time because of the effect of creep. Creep is the phenomenon that occurs in hardened concrete over time, where for constant load or stress, deformation increases. Keeping that in mind, let us look at the definition of modulus of elasticity of concrete. It is thRead more
The Modulus of Elasticity reduces with time because of the effect of creep. Creep is the phenomenon that occurs in hardened concrete over time, where for constant load or stress, deformation increases.
Keeping that in mind, let us look at the definition of modulus of elasticity of concrete. It is the slope of the initial tangent modulus of the stress-strain curve of concrete.
The above graph shows the stress-strain curve of the concrete at an early stage.
Due to creep, for a given load/stress, deformation increases, thereby strain increases. This has been explained in the following graph.
As a result, the slope of the curve reduces and becomes like this.
As the curve descends, the slope of the initial tangent modulus of the stress-strain curve of concrete reduces.
As a result, the modulus of elasticity also reduces.
Thank you!
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