As industrial by-products, mineral admixtures can improve the crack resistance of concrete. However, the early crack resistance performance of concrete mixed with ternary minerals (steel slag powder, mineral powder and fly ash) was not fully understood. In this study, the mechanical and crack resistance performance of each group was preliminarily investigated using the slab method. Then G52 group and the control group were selected for a comparative analysis based on temperature stress testing machine (TSTM) and analytic hierarchy process (AHP) method. The results show that the ternary minerals admixtures reduced the early strength and enhanced the 28d strength of concrete. Meanwhile, they reduced the early adiabatic temperature rise, the maximum compressive stress and the influence of creep on the crack resistance performance of concrete, thereby enhancing the tensile stress at cracking of concrete. Overall, this study provided new insights into the mix proportions of ternary minerals concrete.

Evaluation of early crack resistance performance of concrete mixed with ternary minerals using temperature stress testing machine (TSTM)