摘要
Partially replacing polyvinyl-alcohol(PVA)fibers with polypropylene(PP)fibers in strain-hardening cementitious composites(fiber hybridization)modify certain mechanical properties of these materials.The hybridization based on the introduction of low-modulus hydrophobic polypropylene fibers improves the ductility and the strain-hardening behavior of the cementitious composites containing polyvinyl-alcohol fibers of different types(PVA-SHCC).Pull-out tests indicate that adding PP fibers increases the energy capacity of the hybrid composite with respect to the material containing only PVA fibers under tensile loading,and PP-fiber geometry(i.e.,section shape and length)is a key factor in enhancing the strain capacity.
在应变硬化水泥基复合材料(纤维杂交)中,用聚丙烯部分取代聚乙烯醇(PVA)纤维,可以改善材料的力学性能。通过引入低模量、疏水聚丙烯纤维,提高聚乙烯醇纤维水泥复合材料(PVA-SHCC)的拉伸性和应变硬化性能。拉伸试验结果表明,加入聚丙烯纤维增强了掺杂复合材料的载荷拉伸性能。聚丙烯纤维的几何形状(即截面形状和长度)是提高复合材料应变能力的重要因素。
