Mechanical And Physical Properties Study On Soft Fiber Reinforced Cement Concrete

Cement concrete were extensively used for its high compression strength and lowcost. With the development and advancement of science and technology, higherrequirement was raised on the roads. As road surface materials, cement concrete facedwith new challenge. Because cement concrete belong to a rigid materials, it developedmany cracks in the condition of temperature and stress. The existence of crack reducesthe cement concrete performance, shortens its service life.Mixing high elastic modulus fiber into cement concrete was one of the effectivemethods to solve the problem. The glass fiber and polypropylene fiber is the mosteffective fiber. But the glass fibers will corrode in cement concrete. Therefore,corrosion behavior of glass fiber、design of mix proportion、manufacturing process、optimum amount of fiber were studied in this paper. Two fibers reinforced concretewere compared based on mechanical properties and durability.At first, the corrosion behavior were imitated in basic solution with anti-alkalineglass fiber. Using the method of weight loss to study the corrosion condition ofanti-alkaline glass fiber and the corrosion mechanism were initially studied. In view ofthe corrosion mechanism, the active mixture fly ash and silica fume were added intoconcrete to lower alkalinity to protect glass fiber from corrosion, and the results areideal.Then based design of mix proportion, optimum preparation process weredetermined. The results show that the first mixing method can make the fiber dispersedhomogeneously in the concrete and improve concrete performance index. At the sametime, we determine the optimum mixing amounts, the amounts was1.0kg/m3、0.9kg/m3respectively.Finally, the mechanical properties and durability comparison were proceedbetween anti-alkaline glass fiber and modified polypropylene fiber. Both for themechanical properties of concrete are improved, the anti-alkali glass fiber were betterthan PP fiber. Excellent durability aspects, both are better than ordinary concrete, theanti-alkali glass fiber concrete is slightly worse than modified polypropylene fiberconcrete. Research indicates that anti-alkali glass fiber and modified polypropylenefiber concrete may be used widely, especially in construction and transportationindustry for higher frost resistance cold properties.