PERFORMANCE OF STEEL FIBER REINFORCED CONCRETE UNDER THE ACTION OF FREEZE-THAW CIRCULATION

Through the experiments on freeze-thaw, it was studied the influence of the grade of concrete strength, the volume fraction of steel fiber and number of freeze-thaw circulation on the dynamic modulus of elasticity. The mechanism of peeling and damage of steel fiber reinforced concrete was analyzed and the compressive strongth, splitting strength and rupture strength of steel fiber reinforced concrete after freeze-thaw were tested. Furthermore, the reinforced mechanism of the steel fiber reinforced concrete under the action of freeze-thaw was discussed. The test results show that when the grade of concrete strength is higher, the influence of steel fiber volume fraction on the fros-t resisting property is more obvious, which can inhibit the peeling of the concrete and reduce its damage rate.