Abstract:Ability of concrete to resist plastic cracking can be improved by adding a certain amount of fiber to it. The influence of UFPP fiber and polypropylene(PP) fiber on improvement of impermeability of cement concrete loaded by experiment were studied. The results show that within a certain load capacity the concrete permeability increased, when the load exceeded the ultimate load of concrete is about 30%, the impermeability of concrete come down. At the same time, it was researched on the influence of fiber on the chloride permeability and the freeze proof capability of different ages concrete, and also explained the mechanism of improvement. And the research results are applied in the engineering practice of Shanghai Yangtze River Bridge.
