LAUSR

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.摘要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。