Abstract：To realize the resource utilization of solid waste of iron tailings, steel slag and phosphorus slag, reduce the amount of cement and reduce the adverse impact of iron tailings powder as admixture on concrete, three admixtures of phosphorus slag powder, desulfurization ash powder and steel slag powder were introduced based on high-silicon iron tailings powder. The compressive properties of iron tailing powder-phosphorus slag powder-desulfurization ash powder (IPD), iron tailing powder-phosphorus slag powder-steel slag powder(IPS) and iron tailing powder-steel slag powder-desulfurization ash powder(ISD) concretes were investigated. Mercury injection test and backscattered electron were used to test and analyze the internal pores and interfacial transition zone of concrete. The results show that the 28-day compressive strengthes of IPD system, IPS system and ISD system respectively reach 80.1%, 92.4% and 82.5% of that of pure cement concrete, and the interfacial transition zone between aggregate and cement is more dense after the addition of the admixture with reduced porosity to different degrees. The filling effect of the admixture is well exerted, and the adverse influence of internal porosity on concrete is alleviated.
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