Effect of Iron Tailings and Slag Powders on Workability and Mechanical Properties of Concrete

Tailings are one of the largest solid wastes in stock at present. In order to improve comprehensive utilization rate tailings, especially solve problems fine-grained tailings treatment, concrete composite admixture was prepared by using iron powder and slag powder. study influence on workability long-term mechanical properties concrete, C30 C50 with different dosages were prepared, slump, expansion, flexural strength, splitting tensile compressive strength ages tested. The results showed that proper addition tailing is beneficial working performance can effectively reduce time-loss fluidity. When content 50%, 1080d long age reach 50.3 80.7 MPa. Based 28d relative strength-age prediction model established. calculation experimental show accurately predict micro-powder age, error less than 1%. lay a theoretical foundation for concrete.