Influence of iron tailing powder on properties of concrete with fly ash

The influences of iron tailing powder (ITP) on slump, compressive strength, drying shrinkage, carbonation resistance, chloride permeability, frost resistance and sulfate attack of concrete with fly ash were investigated. The incorporation of ITP enhances cohesiveness of concrete with small loss of slump. Partial replacement of fly ash with ITP increases early-age compressive strength but decreases later-age compressive strength of concrete. Increasing ITP content has little effect on early-age drying shrinkage but decreases total shrinkage within 180 days. The carbonation resistance is improved and the good frost resistance of concrete is obtained by adding ITP. The chloride permeability grade of concrete cannot be affected when the proportion of ITP replacing fly ash does not exceed 50%. The best resistance to sulfate attack is obtained when 50% fly ash is replaced by ITP. Decreasing water/binder ratio is advantageous to improving mechanical properties and durability of concrete containing fly ash and ITP. • The slump slightly reduces with increasing iron tailing powder (ITP) content. • The addition of ITP increases early-age strength but decreases later-age strength. • Increasing ITP content decreases the ultimate drying shrinkage within 180 days. • No more than 50% fly ash replacing by ITP is not harmful to durability of concrete. • Lowering w/b ratio is favorable to properties of concrete with fly ash and ITP.