Dynamic propagation behavior of mode I crack in MSF/PVA-MKPC NSCB specimens after high-temperature exposure

•The mixing of PVA and MSF can retain the strain hardening ability of MKPC after high temperature•The dynamic fracture toughness were calculated by finite element based on the parameters.•The dynamic fracture toughness reaches the minimum at 500 °C, but increases at 800 °C and 1100 °C.•The dynamic fracture toughness of PVA/MSF-MKPC increases with the increase of loading rate.•Crack arrest toughness is greater than initial toughness than extension toughness.