Repairing and protecting layer for reinforced concrete structure body and construction method of repairing and protecting layer

Abstract

The invention discloses a repairing and protecting layer for a reinforced concrete structure body and a construction method of the repairing and protecting layer. A repairing layer made of MPC mortar or a fiber MPC composite is constructed at the repairing part of an old concrete structure body, and a protecting layer made of MPC net paste and positioned on the outer side of the repairing layer is constructed on the surface of the reinforced concrete structure body. By full utilization of the performance advantages that the adhesion force of MPC base material and old concrete is strong, the chloridion permeation resistance is excellent and the concretion is early, strong and quick, and based on economy and permeation resistance optimization, color and luster of the material are adjusted through the change of mixing amount of silica ash and fly ash, the MPC mortar or fiber MPC mortar and the MPC net paste are used in a combined manner, the mortar material is used for reparation, the net paste material is used for protection, and finally the reinforced concrete structure repairing and protecting layer which is bright and smooth in surface, uniform in color and luster and excellent in permeation resistance is formed, so that the damaged concrete structure can be effectively repaired, and the thick and aesthetic magnesium phosphate cement protecting layer is formed outside the reinforced concrete structure body.

Description

technical field [0001] The invention relates to a repair protective layer of a reinforced concrete structure and a construction method thereof, belonging to the technical field of repair, reinforcement and protection of reinforced concrete structures. Background technique [0002] The durability of concrete structures has always been a hot spot in academic research and engineering circles. Salt damage, freeze-thaw damage, and carbonation of concrete structures further lead to rust and swelling damage of steel bars, which seriously affect the bearing capacity and durability of concrete structures. The repair and protection of concrete structures should run through its entire life cycle. [0003] At present, the most commonly used concrete coating protection technology is to apply a protective coating on the surface of concrete or reinforced concrete to form a hydrophobic layer or seal the pores and defects on the concrete surface, effectively preventing the intrusion of moist...

AI Technical Summary

Problems solved by technology

The invention patent (CN103924689A) proposes "the method of applying magnesium phosphate cement to protect steel bars", that is, brushing magnesium phosphate cement slurry on the surface of the bound steel bars to protect the steel bars, but in actual operation, the thickness of the coated slurry is difficult to control uniformly , the vibrating process after pouring concrete is likely to cause the thin layer of magnesium phosphate slurry solidified on the steel bar to be broken and peeled off. Therefore, this method can only have a good protective effect on the steel bar after the steel cage is bound and during the pouring of cement concrete.

Other patents and literature on the repair and protection of magnesium phosphate cement-based materials for reinforced concrete structures have not yet been reported, especially the magnesium phosphate cement-based materials proposed by the present invention have strong resistance to chloride ion penetration, chloride salts, sulfates Corrosion performance, can realize the protective effect on the reinforced concrete structure, and can adjust the amount of silica fume or fly ash in the material component according to the color and decoration needs, and can adjust the material group according to the crack resistance performance requirements of the repaired protective layer Dosage of chopped fibers

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