Experimental study on mechanical properties of steel fiber concrete after freeze-thaw

concrete;  steel fiber;  freeze-thaw;  Mechanical properties

Through the freeze-thaw cycle test of steel fiber concrete, the effects of the number of freeze-thaw cycles, concrete strength grade, steel fiber volume rate and other factors on the compressive strength, splitting strength and flexural strength of steel fiber concrete after freeze-thaw were analyzed, and the reinforcement mechanism of steel fiber on concrete was discussed. The test results show that the addition of steel fiber has little effect on the compressive strength of concrete after freeze-thaw cycle. When the number of freeze-thaw cycles is small, the effect of steel fiber on the increase of splitting strength and flexural strength is more obvious, while when the number of freeze-thaw cycles is large and the volume rate of steel fiber is higher (2%), steel fiber has a certain negative impact on the splitting strength and flexural strength of concrete. The improvement of the strength grade of steel fiber concrete is more effective in improving the frost resistance of steel fiber concrete.