Concrete function of cement cushion block in building

Nowadays, cement is an indispensable building material on construction sites. Although cement cushion blocks are used in the construction industry for many times, few people know its role. What is the role of building cement cushion blocks here?

First point:

The cement cushion block can accept its external force. The maintenance layer has anchoring force on the reinforcement. The anchoring force between the concrete and the reinforcement shall be applied. The two are closely separated and jointly participate in the work. When the maintenance layer is too thin or missing, its anchoring force will be reduced, thus reducing the role of the structure in resisting axial force and bending moment.

Second point:

If Cement cushion block Maintenance structure in Durable concrete The thin maintenance layer in the concrete is easy to penetrate wet gas and water, and the thick maintenance layer is easy to produce cracks, which may cause corrosion and shrinkage of the reinforcement, thus causing damage to the concrete, affecting the use and structure.

Third point:

From the calculation formula of flexural bearing capacity of normal section, it can be seen that when the effective height h0 of the section decreases due to the too thick maintenance layer of the cement cushion block, the flexural bearing capacity of the section will be reduced. It can be seen that the thickness of the maintenance layer is an important factor affecting the structural bearing capacity.

Fourth point:

The fire protection maintenance layer concrete in the cement cushion block has a qualitative heat insulation function, which can stop the maintenance of the steel bars that are easy to soften in case of fire. If the maintenance layer is too thin, it is easy to crack in the high temperature environment, causing the steel bars to reduce strength due to overheating, thus destroying the overall structure.