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采用两端埋设螺杆的等截面轴心受拉试件,在端部粘贴相应长度的碳纤维布,在闭环回路电液伺服试验机上加辅助刚性架,进行混杂纤维混凝土轴心受拉应力-应变全曲线的测试.研究了低体积掺量的钢纤维-聚丙粗纤维-杜拉纤维三元混杂纤维混凝土的轴拉性能随纤维组分、钢纤维长径比、钢纤维类型、活性掺料的变化规律.结果表明:长径比为80,体积分数为0.6%的钢纤维与体积分数为0.29%聚丙烯粗纤维及体积分数为0.11%杜拉纤维三元混杂时,能提高混凝土的初裂强度69%,极限抗拉强度58%,表现出的混杂纤维混凝土的轴拉性能最佳.
The cross section axial tension test specimen with embedded screw at both ends was used, the corresponding length of carbon fiber cloth was pasted at the end, and an auxiliary rigid frame was added to the closed loop electrohydraulic servo testing machine to carry out tensile stress-strain change of the hybrid fiber concrete Curve tests were carried out.The axial tensile properties of steel fiber-polypropylene crude fiber-Dura fiber ternary hybrid fiber reinforced concrete with low volume content were studied with the change of fiber composition, fiber length-diameter ratio, steel fiber type and reactive spice The results show that the initial cracking strength of concrete increases with the aspect ratio of 80, the volume fraction of 0.6% steel fiber and the volume fraction of 0.29% polypropylene crude fiber and the volume fraction of 0.11% Dura fiber ternary hybrid, 69%, the ultimate tensile strength of 58%, showed the best hybrid fiber reinforced concrete axial pull performance.