复掺矿渣微粉与粉煤灰配制尾矿砂混凝土及其应用

Preparation of Ore Tailings Sand(OTS)Concrete by Adding Slag Powder and Fly Ash and Its Application

分别以30%、40%、50%和60%的铁矿尾矿细砂取代天然砂,并复掺矿渣微粉和粉煤灰,配制了C20、C30和C40预拌混凝土,试验研究了混凝土和易性、强度和抗氯离子渗透性等性能。结果表明,以30%、40%和50%铁矿尾矿细砂取代天然砂的各强度等级混凝土和易性均能满足要求;在60%取代率时,混凝土和易性较差,但强度仍能满足要求;50%取代率时,混凝土抗氯离子渗透能力与基准混凝土相当。

Using iron ore tailings sand （OTS） in the ratios of 30%, 40%, 50% and 60% to substitute natural sands, and adding tiny slag powder and fly ash, the ready-mixed concrete with strengths of C20, C30 and C40 are prepared. The properties such as workability, strength and chloride ion permeability resistance of concrete are studied. The results indicate that with the OTS substitution ratio of 30%, 40% and 50%, these OTS-based concrete can meet the workability requirement. With the substitution ratio at 60%, its workability is relatively poor while its strength still meets the requirement. With the substitution ratio at 50%, the OTS-based concrete has the similar chloride ion permeability resistance to the normal concrete.