Compressive performance and microstructure analysis of iron tailings based multi-solid waste concrete
Aiming at the difficulties of stockpiling,low comprehensive utilization rate and low activity,a kind of multi-solid waste concrete with iron tailings,steel slag and desulfurized ash as composite admixture was prepared.The effects of the content of composite admixtures and the fineness of iron tailings on the compressive strength of concrete were studied by testing the compressive properties,and the microstructure of concrete was investigated by mercury injection method(MIP)and backscattering electron imaging technology(BSE).The results show that the composite admixture significantly influences the early compressive strength of concrete.The 28 d compressive strength of concrete with less than 20%admixture is the same as that of the test group without admixture.The compressive strength of concrete with 30%admixture increases first and then decreases with the increase of the specific surface area of iron tailings.Adding composite admixtures and reducing the fineness of iron tailings can improve the pore structure of concrete and the compactness of the interfacial transition zone.
万方数据
维普
