Mechanical performance of shotcrete made with a high-strength cement-based mineral accelerator

This research investigated the mechanical performance of shotcrete that used a high-strength cement-based mineral accelerator (HS-CM) to enhance the long-term strength performance. HS-CM was added at 5-8% with respect to the cement weight; the cement-based mineral accelerator (CM) was mixed at 5% for comparison. The setting time, compressive strength, and flexural strength were measured. As the test result, in case of setting time, HS-CM which used more than 6% was slower than CM at initial set; but final set was faster. Compared with the mixture made with the CM, the HS-CM had approximately the same compressive strength at early age but higher compressive strength after 7 days. The trend in flexural strength was similar to that of the compressive strength.