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 resis-tance, chloride permeability, frost resistance and sulfate attack of concrete with fly ash were investigated. The in -corporation 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. Increas-ing 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 chlo-ride permeability grade of concrete cannot be affected when the proportion of ITP replacing fly ash does not ex-ceed 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. (c) 2022 Elsevier B.V. All rights reserved.

Automated summary

The study revealed that ITP had some influence on the performance of concrete, partially replacing fly ash can improve the early-age compressive strength of concrete but decrease the later-age compressive strength. Increasing ITP content can enhance carbonation resistance and frost resistance, while the best sulfate attack resistance is achieved with a 50% substitution ratio.