芳纶纤维和超高分子量聚乙烯纤维制备工程用纤维/水泥复合材料的适用性

研究了两种高强合成纤维在工程用纤维/水泥复合材料制备过程中的适用性，其中，芳纶纤维的表面为亲水性，超高分子量聚乙烯（UHMWPE）纤维的表面为憎水性。研究结果表明：工程用芳纶纤维/水泥复合材料拉伸破坏过程中无应变硬化能力且表现为单裂纹破坏现象；工程用UHMWPE纤维/水泥复合材料拉伸破坏过程中表现出良好的应变硬化能力和多裂纹开裂特性。因此，两种纤维相比，UHMWPE纤维适宜于工程用纤维/水泥复合材料的制备。随着水胶比的降低，工程用UHMWPE纤维/水泥复合材料抗拉强度增大，但应变硬化能力降低，因此，在制备工程用UHMWPE纤维/水泥复合材料的过程中，应协调纤维抗拉强度和基体与纤维之间界面过渡区的品质。

Applicability of aramid fiber and ultra-high molecular weight polyethylene fiber for engineered fiber/cement composites

The applicabilities of two high-strength synthetic fibers for engineered fiber/cement composites were researched, with hydrophilic aramid fiber and hydrophobic ultra-high molecular weight polyethylene (UHMWPE) fiber. The results show that engineered aramid fiber/cement composites have no strain-hardening ability and present single crack failure pattern under uniaxial tensile load, and engineered UHMWPE fiber/cement composites show strain-hardening ability and multi cracking pattern. The UHMWPE fiber is more suitable for fiber/cement producing compared with aramid fiber. With the decrease of matrix water-to-binder ratio, the tensile strength of engineered UHMWPE fiber/cement composites increases but the strain-hardening ability decreases. It is suggested that when producing engineered UHMWPE fiber/cement composites, coordination of fiber tensile strength and fiber-matrix bond strength should be considered.