The concrete reinforcement cushion block produced by the conical concrete reinforcement cushion block production equipment has grooves on the front and rear planes and four sides. The cushion block of reinforcement protective layer is placed under the beam in the brick concrete structure to expand the bearing area, which is a common method to solve local bearing. The thickness of concrete cover of reinforcement is related to the bearing capacity, durability, fire resistance and other properties of the structure.
Role and impact:
1. The thin protective layer in the durability concrete of the maintenance structure is easy to penetrate damp gas and water, and the thick protective layer is easy to produce cracks, which may cause corrosion and expansion of the reinforcement, thus causing damage to the concrete and affecting the use.
2. The protective layer under the action of external force has anchoring force to the reinforcement. The anchoring force between concrete and reinforcement is used to closely combine the two and participate in the work together. When the protective layer is too thin or missing, its anchoring force will be reduced, thus reducing the resistance of the structure to axial force and bending moment.
3. The concrete of fire protection layer has the function of heat insulation, which can protect the steel bars that are easy to soften in case of fire. If the thickness of the protective layer is too thin, it is easy to crack in the high temperature environment, resulting in the strength reduction of the steel bars due to overheating, thus damaging the overall structure. In 2003, a project in Hengyang, Hunan Province, due to the high temperature and high heat generated by the fire, the reinforcement softened and collapsed, causing heavy casualties.
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