This study investigated physcal properties of high performance concrete(HPC) using the garnet(GA) and Fly-ash(FA) under high temperature. After heating up the concrete, its appearance, failure mode, residual compressive strength, weight reduction ratio and other physical properties of concrete, it was mixed with nylon(Ny), polypropylene(PP), steel fiber(SF). The specimen was exposed to 100~800℃ and its crack control, spalling prevention and other physical characteristics were reviewed.