Reinforcement method of ECC (Engineered Cementitious Composite) fiber woven mesh for improving anti-seismic performance of masonry wall

Abstract

The invention relates to a reinforcement method of an ECC (Engineered Cementitious Composite) fiber woven mesh for improving the anti-seismic performance of a masonry wall, and belongs to a masonry wall repairing and reinforcing and construction method. The method comprises the steps that (1) a masonry wall to be reinforced is subjected to pretreatment; (2) dust on the surface of the masonry wallto be reinforced is cleaned; the masonry wall to be reinforced is wetted; then, a layer of ECC base body is smeared onto the surface of the masonry wall to be reinforced; (3) the fiber woven mesh is impregnated by polymer cement mortar and is then laid at the surface of the ECC base body; (4) a layer of ECC base body is smeared onto the surface of the fiber woven mesh again; (5) wet water curing is performed for 28 days until the service life of the ECC base body is reached. The anti-shearing and anti-bending performance of the masonry wall can be effectively improved; the risk that a masonrystructure generates serious damage or even collapse in an earthquake is reduced; the structure repairing work after strong earthquake is reduced or even omitted; the durability of the reinforcing structure is improved. Compared with a traditional reinforcing method, the reinforcement method has the advantages that the self weight of the masonry structure is hardly increased; the use space of a building after the reinforcement is hardly reduced; the construction is convenient.

Description

technical field [0001] The invention relates to the technical field of repair, reinforcement and construction of masonry walls, in particular to a reinforcement method of ECC composite fiber braided nets for improving the seismic performance of masonry walls. technical background [0002] Masonry is made of blocks and mortar. Its basic mechanical characteristics are high compressive strength, but extremely low tensile and shear strength, which leads to poor seismic performance of the masonry structure as a whole. Masonry structure is one of the oldest architectural forms, and it will still occupy an important position in my country's industrial and civil buildings for a long period of time in the future. The results of the earthquake damage investigation show that the masonry structures suffered the most severe damage in previous earthquakes, and the main reason for the cracking and even collapse of masonry structures in earthquakes is the insufficient shear and flexural bea...

AI Technical Summary

Problems solved by technology

The disadvantage of FRP is that the use of epoxy resin as the matrix material is prone to incompatibility with masonry materials, and there are problems such as fire resistance, durability, and moisture impermeability; the disadvantage of ECC is that the chopped fibers are in the matrix. The center is random and randomly distributed, and the bearing direction is not clear, resulting in low reinforcement efficiency of ECC reinforcement for masonry walls

The disadvantage of TRC is that the width of the cracks formed under the limit state of normal use may be large, which may have a certain impact on the appearance and durability of the reinforced structure. The main reason is that fine concrete has certain brittle characteristics and poor crack resistance.

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