PET纤维格栅/钢纤维增强水泥基复合材料混杂效应研究

Research on PET Fiber Grid/Steel Fiber Reinforced Cement Based Composites Hybrid Effect

将连续PET纤维格栅与短切钢纤维混掺制备混杂纤维增强水泥基复合材料,其抗压强度高达147.7MPa、抗折强度高达52.6MPa。研究各纤维掺量对混凝土抗压性能及抗折性能影响,表征基体材料与纤维界面微观结构,并分析PET纤维格栅及钢纤维混杂效应。结果表明:钢纤维与PET纤维格栅对水泥基复合材料抗折性能都有增强作用,但钢纤维在抗折性能上发挥了主要作用,导致抗折性能混杂效应并不明显;对于抗压性能,PET纤维格栅对其强度增长有弊,但钢纤维的增强效应弥补了PET纤维格栅的负作用。

Hybrid fiber reinforced cement-based composite was prepared by mixing continuous PET fiber grille with short steel fiber.The compressive strength and flexural strength of the composite were 147.7 MPa and 52.6 MPa,respectively.The influence of fiber content on compressive and flexural properties of concrete was studied.The microstructure of interface between matrix material and fiber was characterized.The hybrid effect of PET fiber grille and steel fiber was analyzed.The results showed that both steel fiber and PET fiber grille could enhance the flexural properties of cement-based composites,but steel fiber played a major role in the flexural performance,resulting in the mixed effect of flexural properties was not obvious;for compressive properties,PET fiber grille had disadvantages in strength growth,but the reinforcement effect of steel fiber made up for the negative effect of PET fiber grille.