Axial Compressive Tests and Bearing Capacity Calculations for Short Circular Concrete Columns Strengthened with Woven Carbon Fiber Mesh and Polypropylene Fiber-Reinforced Cement-Based Composite Materials
Axial Compressive Tests and Bearing Capacity Calculations for Short Circular Concrete Columns Strengthened with Woven Carbon Fiber Mesh and Polypropylene Fiber-Reinforced Cement-Based Composite Materials
Axial compressive tests of 14 short circular concrete columns strengthened with woven carbon fi-ber mesh and polypropylene fiber-reinforced cement-based composite materials were conducted.The ulti-mate bearing capacity and damage pattern of each specimen were obtained,the curves between average compressive stress and concrete strain,the curves between average compressive stress and strain of woven carbon fibers mesh,and the ultimate bearing capacity histogram of each specimen were given.The effects of parameters such as the polypropylene fiber content in the reinforced cement-based composite material,the number of layers and the grid sizes on the axial compressive performances and damage mechanisms of specimens were analyzed.The test results showed that the ultimate bearing capacity of the short circular columns reinforced with woven carbon fiber mesh and polypropylene fiber-reinforced concrete could be sig-nificantly improved;in the case of a small mass content,the changes in the polypropylene fiber content(with a mass content of 0.05%,0.15%,0.25%)in the reinforced layer had a little effect on the bearing capacity of specimens;the bearing capacity of specimens in a certain range increased with the number of layers of woven carbon fiber mesh.The bearing capacity of specimens increased with the increase in the number of wrapped layers of woven carbon fiber mesh;compared with the mesh with the grid of 2 cm×2 cm,the mesh with the grid of 1 cm×1 cm was more effective in improving the bearing capacity of speci-mens.By introducing four reasonable basic assumptions and two strength models,the calculation method of the axial compressive bearing capacity for composite reinforced columns with woven carbon fiber mesh and polypropylene fiber-reinforced cement-based composite materials was proposed.The theoretical calculated values obtained by the proposed method and the calculation methods from related literatures were compared with the test results,and the results showed that the theoretical values calculated by the proposed method were in good agreement with the test results,and the theoretical values were smaller than the test values.It was indicated that the proposed formula had certain safety reserve.
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