Experimental Study on Volume Deformation of Iron Tailing-steel Slag Aggregate Concrete

Abstract

Utilization in building materials is one of the main technical ideas for realizing large-scale, high added value recycling of industrial solid wastes such as iron tailings and steel slags. It is common to use only iron tailings or steel slags instead of ordinary sands or stones as concrete aggregates, but using them at the same time and combining their performance advantages to improve the mechanical properties and durability of concrete has not yet appeared. Therefore, sands were replaced by iron tailings as fine aggregates and stones were replaced by steel slags as coarse aggregates to prepare iron tailing-steel slag concrete in this research. And the strength, early crack resistance and long-term volume deformation of iron tailing-steel slag concrete were tested. The results show that iron tailings have negative effect on concrete strength when used as fine aggregates and steel slags are beneficial to concrete strength with a small adding amount. In addition, iron tailings with proper adding amount can inhibit the deformation of concrete caused by steel slags, in consequence of which early crack resistance and volume stability of concrete are improved.