标准养护条件下铁尾矿制备RPC力学性能研究

标准养护条件下,采用固体废弃物铁尾矿砂代替石英砂设计制备RPC,研究其引入对RPC工作性能、强度和弯曲韧性的影响,通过XRD和SEM研究其对RPC水化反应和微观结构的影响.结果表明,标准养护条件下,铁尾矿砂RPC28d抗压强度和抗弯拉强度可分别达到117.5 MPa和24.2 MPa;铁尾矿砂的引入可降低RPC流动度、...

Study on the mechanical properties of RPC prepared from iron tailings under standard curing conditions

This design of iron tailings sand instead of quartz sand is used to prepare RPC under standard maintenance conditions,and the influence of its introduction on the working performance,strength and bending toughness of RPC is studied.Its influence on RPC hydration reaction and microstructure is investigated by XRD and SEM.The results show that under standard curing conditions,the compressive strength and flexural strength of iron tailings sand RPC28 d can reach 124.5 MPa and 26.2 MPa,respectively.The introduction of iron tailings sand can reduce the fluidity,compressive strength and flexural strength of the RPC.ASTM C1609 and JCI SF4 are used to evaluate the bending toughness of iron tailings sand RPC and the toughness indices of I₁₀ andδ_b are 78.0%and 77.8%of quartz sand RPC.Microscopic analysis shows that an appropriate amount of iron tailings can promote cement hydration reaction and the hydration reaction can be adversely affected if the amount of iron ore tailings continues increasing.