Study on mechanical properties of steel fiber reinforced nano-concrete (SFRNC) after elevated temperature

This paper presented 180 specimens to investigate mechanical properties of steel fiber reinforced Nano-concrete (SFRNC) after elevated temperature through the method of compression test, splitting tension test and flexure test. The test parameters effects of different elevated temperature and different content of steel fiber on mechanical properties including compressive strength, splitting tensile strength and flexural strength of SFRNC were analyzed in this paper. The integrity of Nano-concrete after elevated temperature could be improved because of the mixing of steel fiber, which could be observed from the failure process of SFRNC. Furthermore, mixing of steel fiber can change failure mode of Nano-concrete and improve the ductility of concrete greatly. It could be summarized that the elevated temperature had negative effects on compressive strength, splitting tensile strength and flexural strength of SFRNC. And it also could be found that Nano-concrete mixed with steel fiber can improve residual compressive strength, splitting tensile strength and flexural strength of these specimens after high temperature. © 2021