Volcanic activity and thermal excitation of rich-silicon iron ore tailing in concrete

Abstract

In order to distinguish the filling effect and volcanic activity and explore the ways motivating the activity of rich-silicon iron ore tailing(IOT), inert quartz was brought in as the correction standard, the influences of fineness, calcination, thermal curing system and some other factors were investigated by IR, XRD, MIP, and so on microscopic methods. The experimental results show grinding and calcination can only change the amorphous state of SiO₂, and IOT do not have volcanic activity in concrete cured under room temperature condition. Thermal curing systems can stimulate the activity of IOT, especially mortar cured by autoclave curing system can consume a large amount of Ca(OH)₂ and hard calcium silicate and has a closer structure. When the specific surface area of IOT powder is 800 m²/kg, and 30% cement is replaced by IOT powder, the mortar strength with IOT powder is even higher than that with cementonly.

Keywords

volcanic activity / rich-silicon iron ore tailing / motivating / thermal curing system

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