Preparation of UHPC with Iron Ore Tailing Powder as Mineral Additive

Abstract

In order to study the rules and mechanism of rich-silicon iron ore tailing powder (IOTP) replacing fly ash and micro-bead in UHPC, the influences of different specific surface area and dosage of IOTP replacing fly ash and micro-bead on its strength and liquidity were tested. Moreover, the pore structure and hydration products morphology of UHPC were tested by MIP and SEM, respectively. The results show that IOTP can increase the liquidity of UHPC, when alternative content of IOTP is less than 10%, proper specific surface area of IOTP can improve the strength, pore structure and hydration products structure of UHPC. However, when alternative content of IOTP is more than 15%, it shows up an inverse pattern.