纳米SiO_(2)+钢纤维协同改性橡胶混凝土试验研究

Research on Rubber Concrete Modifi ed by Nano-SiO_(2)+ Steel Fiber

针对橡胶混凝土力学性能不高的问题,提出用纳米SiO_(2)和钢纤维对橡胶混凝土进行协同改性,并通过电子扫描显微镜和X射线衍射分析仪对协同改性后的橡胶混凝土微观结构进行表征,分析了改性橡胶混凝土的力学性能。结果表明,掺入纳米SiO_(2)后,有效减少了橡胶混凝土的微缺陷和空隙,优化了钢纤维和混凝土基体的界面粘结性能,增强了橡胶混凝土的抗压强度和劈裂抗拉强度。当钢纤维体积率为1%,纳米SiO_(2)掺量为1%,橡胶含量为5%时,C35CR5、C45CR5两种强度的橡胶混凝土28d的抗压强度可达到48.5MPa和55.9MPa,28d劈裂抗拉强度可达5.12MPa,证实纳米SiO_(2)和钢纤维协同改性能有效增强橡胶混凝土的力学性能。

In view of the poor mechanical properties of rubber concrete,nano-SiO_(2) and steel fiber were used to modify rubber concrete.The micro structure of rubber concrete was characterized by scanning electron microscope and X-ray diffraction,and the mechanical properties of modified rubber concrete were analyzed.The results show that the addition of nano-SiO_(2) can effectively reduce the micro defects and voids of rubber concrete,optimize the interfacial bonding performance between steel fiber and concrete matrix,and enhance the compressive strength and splitting tensile strength of rubber concrete.When the volume ratio of steel fiber is 1%,the content of nano-SiO_(2) is 1%,and the rubber content is 5%,the compressive strength of C35CR5 and C45CR5 rubber concrete can reach 47.14 MPa and 54.94 MPa at 28d,and the splitting tensile strength can reach 5.12 MPa at 28d,which proves that the mechanical properties of rubber concrete can be effectively enhanced by the synergistic modification of nano-SiO_(2) and steel fiber.