The Effect of Iron Tailing Powder on the Cement Mortar Strength

The iron tailing powder can increases fluidity of cement mortar because the fluidity ratio of iron tailing powder whose fineness is 340m(2)/kg is 105%, and the fluidity ratio of grinded iron tailing powder whose fineness is 680m(2)/kg is 120%. The strengths increase with increasing of iron tailing powder dosage, but when dosage exceeds 10% strength decreases; for grinded iron tailing powder, when dosage does not exceed 30%, strength increases; when dosage is same, grinded iron tailing powder can increase strength more than iron tailing powder. When dosage of iron tailing powder is less than 20%, it can improve crack resistance. When dosage of iron tailing powder is less than 20% and grinded iron tailing powder is less than 50%, specific strength and specific strength coefficient for 28 days are increased, and contribution rate of activity is greater than zero, which means that iron tailing powders benefit to strength.