Experimental research on freeze-thaw damage of steel-polypropylene hybrid fiber reinforced concrete
To study the effect of hybrid fiber on the frost resistance of high performance concrete,the quick freeze-thaw cycle tests were carried out on plain concrete,steel fiber concrete,polypropylene fiber concrete and steel-polypropylene hybrid fiber reinforced concrete.The strength indexes of the specimens were tested under freeze-thaw action and the variation laws of mass loss rate and relative dynamic elastic modulus were analyzed.The results show that the addition of fiber is beneficial to improve the frost resistance of high performance concrete,and the steel-polypropylene hybrid fiber reinforced concrete has the best frost resistance.After 200 times freeze-thaw cycles,the loss rate of mass,the relative dynamic elastic modulus loss rate and the strength loss of steel-polypropylene hybrid fiber reinforced concrete were all the lowest.The freeze-thaw damage model of fiber reinforced concrete based on three degree polynomial is more accurate than that based on exponential functionand it has good applicability in describing the degree of freeze-thaw damage of fiber reinforced concrete.
hybrid fiber reinforced concretefreeze-thaw damage mechanismdamage variablefreeze-thaw damage model
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