Experimental study on expansion performance of ultra-high performance concrete

The expansion performance of ultra-high performance concrete (UHPC) is experimentally studied, and the influence of expansion agent on the expansion performance of UHPC is analyzed. The results show that type FP expansive agent can significantly improve the expansion performance of UHPC in the early hardening stage (3 hours). Type II expansive agent can significantly improve the later expansion performance of UHPC (3 hours to 24 hours). The combination of the two can meet the expansion performance index of UHPC required by the project. The optimum content of type FP and type II expansive agent is 0.1% and 6% respectively. The research conclusions can provide basis for UHPC grouting construction.