Research on mechanical properties of ultra-high performance fiber reinforced cement-based composite after elevated temperature

This research investigated the mechanical properties of ultra-high performance fiber reinforced cement-based composite (UHPFRC) after exposure to elevated temperatures ranging from 200 to 300 °C. The cube compressive strength, axial compressive strength, and flexural strength were studied with 150 specimens. The effects of volume ratio of steel fiber, elevated temperature, and high temperature duration on the properties of UHPFRC were discussed in the present study. The result indicated that the compressive strength and axial compressive strength were improved after the UHPFRC was subjected to the elevated temperature. However, the effect of elevated temperature was not significant on the flexural strength. The effects of steel fiber volume ratio on the properties of UHPFRC were obvious. The cube compressive strength, axial compressive strength, and flexural strength were greatly improved with the rising of steel fiber volume ratio. Furthermore, the calculation formulas of the cube compressive strength, axial compressive strength, and flexural strength of UHPFRC were proposed in this presented study. The calculated results were compared with the test results, which indicated that the calculated formulas were greatly agreed with the test.