Research on Flexural Crack Resistance of Polypropylene Fiber Concrete Beams
In order to study the flexural cracking performance of polypropylene fiber concrete beams and determine the optimum polypropylene fiber content of concrete beams to resist cracking,15 reinforced concrete beams are made,and 5 fiber content levels are designed to carry out flexural cracking resistance tests.The influences of different content levels on crack expansion,strain and mid-span load displacement curve of beam specimens are analyzed.The results show that the bridging action of polypropylene fiber can contain the local cracks of concrete,increase the ductility of specimens,delay the time of initial cracks,and improve the cracking stress and cracking energy of specimens.However,there is no positive correlation with the fiber content level,and the lifting effect is the best when the volume content is 0.2％,which is the best bending and cracking resistance of specimens.
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