Anotace:
In this paper, a new method of steel mesh reinforced polyurethane concrete (SMPUC) material for bridge reinforcement is proposed because of the peeling failure of the reinforced layer of steel mesh reinforced polymer mortar (SMPM) material. Using the excellent anti-corrosion and tensile properties of high-strength steel mesh, as well as the advantages of strong adhesion and fast curing speed of polyurethane concrete, the two materials are combined together. In order to verify the feasibility of this strengthening method, the mechanical properties of SMPUC material are investigated by bending test of SMPUC material sheet. The main factors affecting the tensile properties of the composites are analyzed by considering the test variables such as specimen width, specimen thickness, glue-powder ratio and curing time. Based on the simplified tension model of high strength steel wires and the stress-strain relationship between tension and compression of polyurethane concrete, the calculation method of flexural bearing capacity of composite materials is obtained. The test results show that the flexural strength of the composite can be improved by increasing the width of the specimen, and the deflection can be reduced by increasing the reinforcement ratio, while the influence of the glue-powder ratio on the deflection is small.