混掺钢-塑纤维对高延性水泥基复合材料压弯性能的影响

Effect of steel-plastic fibers on the compressive strength and bending performances of engineered cementitious composite

为了探究钢-塑纤维对高延性水泥基复合材料(ECC)力学性能的影响,对不同种类(聚丙烯、聚乙烯醇、钢纤维)及不同掺量纤维的ECC进行抗压和抗弯试验。结果表明:单掺塑料纤维对ECC抗压强度提高不明显,但对ECC抗弯性能的增强作用较大;单掺钢纤维对ECC抗压和抗弯强度提高幅度较大;混掺钢-塑纤维对ECC抗压和抗弯强度提高幅度比单掺时显著,聚丙烯纤维和钢纤维体积掺量均为1.0%混掺时,对ECC抗压和抗弯性能增强作用最好,可以作为最优配合比。

In order to explore the effect of steel-plastic fibers on the mechanical properties of engineered cementitious composite(ECC),the tests of compressive strength and bending performances were carried out on different kinds and contents of fibers(polypropylene,polyvinyl alcohol,steel fiber).The results show that the compressive strength of ECC is not improved obviously by single plastic fiber,but the bending strength of ECC is enhanced greatly.The compressive strength and bending strength of ECC increased significantly by steel fiber.The compressive strength and bending strength of mixed steel-plastic fibers reinforced ECC were significantly higher than that of the single-doped fiber,when the volume fraction of polypropylene fiber and steel fiber are both 1.0%,the compressive strength and bending performances of ECC are the best,which can be used as the optimal mixture ratio.