What is cohesion of concrete?

Cohesiveness is the element of workability which indicates whether a mix is harsh, sticky, or plastic. Plasticity is a desirable property in concrete, indicating that a mix can be molded and hold a shape when formed. A harsh mix lacks plasticity and the ingredients may tend to separate.

What is hardened concrete?

Hardened concrete is a type of concrete that is strong and have the capacity to bear the structural as well as service loads that are applied to it. Hardened concrete is one of the strongest and durable construction materials. Hardened concrete is concrete that is completely set and able to take the loads.

What is lean mix concrete?

Lean concrete mixes is a concrete mix with low cement content and high percentages of aggregates, it is used in several works such as the blinding concrete under foundations and as leveling course below footings or in mass concrete such as dams.

What is the density of RCC?

2500 kg/m3
The density of RCC is 2500 kg/m3 or 25 KN/m3, as specified by the standards.

What is the elasticity of concrete?

The modulus of elasticity of concrete is relatively constant at low stress levels but starts decreasing at higher stress levels as matrix cracking develops. The elastic modulus of the hardened paste may be in the order of 10-30 GPa and aggregates about 45 to 85 GPa.

What is a lightweight concrete?

Lightweight concrete is a mixture made with lightweight coarse aggregates such as shale, clay, or slate, which give it its characteristic low density. It is being increasingly used to build sleek foundations, and has emerged as a viable alternative to regular concrete.

What is a harsh concrete mix?

A harsh concrete mix is the result of poor ratios of constituent components: ie Water to cement ratio and ratios of aggregates (fine and coarse). Too much water and the mix segregates, with water being forced to the surface of the concrete.

What is meant by hardness of concrete?

Harshness of concrete is the mix which doesn’t give proper smoothness to the surface even after certain amount of trowelling. It’s because of poor grading of coarse aggregate, cement mortar not sufficient to fill the voids. What will the setting time be for a rapid hardening cement?

What is the meaning of harsh mix?

The Harsh mix resulted from low water cement ratio and that leads to Honeycomb of the structure or particular member A harsh concrete mix is the result of poor ratios of constituent components: ie Water to cement ratio and ratios of aggregates (fine and coarse).

What is an unworkable concrete called?

An unworkable concrete can also be called as harsh concrete. It is a concrete with very little amount of water. The hand mixing of such concrete is not easy. Such type of concrete has high segregation of aggregates as cement paste is not lubricated properly to stick to the aggregates.