道路用塑钢纤维-橡胶混凝土配合比及本构关系研究

Research on Mix Proportion and Constitutive Relation of Plastic Steel Fiber-Rubber Concrete Used in Road

通过正交试验,选取塑钢纤维掺量、橡胶掺量及不同的橡胶改性方法等三种因素,对路用塑钢纤维-改性橡胶混凝土基本力学性能展开研究。研究结果表明,塑钢纤维的掺加可以在一定程度上弥补橡胶混凝土强度的不利影响,随着塑钢纤维掺量的增大,橡胶混凝土强度有所提高,弹性模量降低;对橡胶进行改性处理有利于增强橡胶与水泥基体间粘结强度,优化橡胶混凝土力学性能,其中Al_2(SO_4)_3溶液浸泡法改性效果最佳。基于配合比优选结果,拟合出不同塑钢纤维掺量混凝土应力-应变本构曲线。

On the basis of orthogonal test,mechanical properties of plastic-steel fiber concrete were studied.Three factors were selected for this test,namely the amount of mixing rubber,rubber modification method and the content of steel fiber.The results indicate that adding steel plastic fiber can partly compensate for the adverse effects of rubber on concrete strength.With the increase of the content of steel fiber,the strength of rubber concrete increases.The modification treatment of rubber is beneficial to the binding between rubber and cement matrix,and optimizes the mechanical properties of rubber concrete.The method of Al_2(SO_4)_3 solution immersion is the best for mechanical properties of rubber concrete.Based on the optimization results,the stress-strain constitutive equation was given for different dosage of steel fiber reinforced concrete.