玄武岩纤维对再生骨料混凝土力学性能的影响与数值模拟研究

Effects and numerical simulation of basalt fibers on the mechanical properties of recycled aggregate concrete

研究了玄武岩纤维对再生骨料混凝土(RAC)力学性能的影响,对玄武岩纤维掺量为0、0.3%、0.6%、0.9%的再生混凝土进行了抗压、抗折、轴压及劈裂抗拉试验。拟合了不同纤维掺量的再生骨料混凝土的应力应变曲线,对玄武岩纤维再生骨料混凝土的抗折破坏进行了数值模拟。研究结果显示:玄武岩纤维可以有效改善RAC力学性能。相较未掺入纤维的RAC分析可得,抗压强度和劈裂抗拉强度在纤维掺量为0.3%时改善程度达到最大,分别为39.42、3.03 MPa,提高了13.44%、6.32%;抗折强度和轴心抗压强度在纤维掺量为0.6%时改善程度达到最大,分别为5.01、27.46 MPa,提高了10.35%、10.9%。但是过量纤维的掺入使得纤维分布不均匀,反而导致RAC力学性能降低。

The effect of basalt fiber on the mechanical properties of recycled aggregate concrete(RAC)was studied,and the repression of the basalt fiber strained by 0,0.3%,0.6%and 0.9%of the regenerative concrete was tested against pressure,folding,shaft pressure and cracking.The stress strain curve of recycled aggregate concrete with different fiber dossing volume was fitted,and the anti-fold damage of the regenerative aggregate concrete of basalt fiber was simulated numerically.The results show that basalt fibercane can effectively improve RAC mechanical properties.Compared with RAC analysis without fiber,the strength of anti-pressure and cracking and pulling strength improved to the maximum extent when the fiber dossed was 0.3%,with 39.42 MPa and 3.03 MPa respectively,increasing by 13.44%and 6.32%of the fold-resistant strength and shaft pressure strength in the fiber doping of 0.6%of the maximum improvement,respectively,5.01 MPa and 27.46 MPa,increased by 10.35%and 10.9%.However,the doping of excess fiber makes the fiber distribution uneven,and causes the RAC mechanical performance to decrease.