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.

Silicon carbide whiskers (SiCw) exhibit superior physical and chemical properties, but their impact on the dynamic performance of mortar is unknown. In this study, SiCw-modified mortars with 0.1, 0.2 and 0.3 wt% (of cement) SiCw were prepared, and their quasistatic mechanical properties and dynamic compressive resistance were investigated. Additionally, the impact compression tests were performed by utilizing Phi 74 mm split Hopkinson pressure bars. The results demonstrated that adding an appropriate content of SiCw enhanced the quasistatic and dynamic compressive strength while reducing the strain rate sensitivity of SiCw-modified mortars. Meanwhile, mortar with 0.2 wt% SiCw exhibited the maximum dynamic compressive strength and dynamic ultimate toughness. Overall, this study provided a theoretical basis for applying SiCw in improving dynamic compressive performance of mortar.