【摘要】 为探究高延性碱矿渣复合材料在不同激发剂模数下拉压性能的变化,对模数为0.5～1.6的高延性碱矿渣复合材料进行了单轴抗压和拉伸试验,同时利用烧失量法测定其水化程度,并通过三点抗弯和单裂缝拉伸等细观试验进行高延性机理分析。结果表明:随着激发剂模数增加,高延性碱矿渣复合材料的抗压与拉伸强度均呈现下降趋势;而拉伸应变则呈现先增后减,于0.8～1.1范围达到最佳;与强度变化趋势一致,化学结合水量随模数增加而逐渐减小;基体断裂韧度和基体断裂能同强度变化趋势相符,纤维最大桥接应力和纤维桥接余能同应变变化规律相似,应变硬化性能指标能够合理反映拉伸应变的大小。更多还原

【Abstract】 In order to explore the changes of tensile and compressive properties of high ductile alkaliactivated slag composites under different alkaline activator modulus, uniaxial compressive and tensile tests are performed on the high ductile alkali-activated slag composites with the modulus of 0.5-1.6. At the same time, the hydration degree is measured by loss-on-ignition(LOI). Its high ductile mechanism is analyzed through three-point bending and single-crack tensile tests. The results show that as the activator modulus increases, the compressive and tensile strengths of alkali-activated slag composites show the downward trend. The tensile strain first increases and then decreases with the increase of the modulus, and it reaches the optimum in the range of 0.8-1.1. In accordance with the change trend of strength, the content of chemically bound water gradually decreases with the increase of the modulus. The fracture toughness and energy of the matrix are consistent with the change trend of the strength. The maximum stress and the residual energy of the fiber bridging are similar to the change law of the strain. The pseudo strain hardening performance(PSH) index can reasonably reflect the magnitude of the tensile strain.更多还原