针对项目组研发的高性能环保型建材即替代比率达50%的尾矿砂PVA纤维水泥基复合材料,采用立方体抗压实验、薄板四点弯曲实验和薄板拉伸实验,分别测得了该复合材料的抗压强度、弯曲荷载-挠度位移和拉伸应力-应变等特性曲线,获得了该复合材料的弯曲韧性和弯曲强度以及断裂能和抗拉强度。通过实验,研究PVA纤维掺量和水胶比等因素对尾矿砂PVA纤维水泥基复合材料增强和增韧性能的影响。实验结果表明,配合比对尾矿砂PVA纤维增韧水泥基复合材料的力学性能有显著影响;合适的配合比可使该复合材料获得准应变硬化和多裂缝特征,使其具有良好的弯曲韧性和抗拉延性以及较好的抗压强度、弯曲强度和抗拉强度。综合评价了尾矿砂PVA纤维增强水泥基复合材料的强度、韧性及其适用性,为该环保型复合材料的工程应用提供了依据。 Aiming at the high-performance and environment-friendly building materials developed by the project team, the tailing-sand PVA fiber cement-based composite material with the substitution ratio of 50% is adopted. The cubic compression test, the four-point bending test and the tensile test of the sheet are respectively measured. Compressive strength, flexural load-deflection displacement and tensile stress-strain curves were obtained. The flexural toughness and flexural strength, as well as the fracture energy and tensile strength of the composites were obtained. Through experiments, the effect of PVA fiber content and water cement ratio on the reinforcement and toughening properties of tailings PVA fiber cementitious composites was studied. The experimental results show that the blending ratio has a significant effect on the mechanical properties of tailings-reinforced PVA fiber-toughened cement-based composites. The proper compounding ratio can make the composites obtain quasi-strain hardening and multi-fracture characteristics, which has good flexural toughness and toughness. Ductility and better compressive strength, flexural strength and tensile strength. Comprehensive evaluation of the strength, toughness and applicability of tailings PVA fiber reinforced cement-based composites provide the basis for the engineering application of the environmentally friendly composite materials.