Experimental Study On Properties Of Polypropylene Fiber Reinforced Lightweight Aggregate Concrete

Light weight aggregate concrete has light weight, high strength, thermal insulation, fire resistance, frost resistance, seismic resistance, chemical corrosion and many other advantages. However, due to the low tensile, shear strength of lightweight aggregate concrete, to a certain extent, influence the extensive use of the lightweight aggregate concrete. By adding polypropylene fiber to lightweight aggregate concrete (LWAC) can effectively suppress the early shrinkage cracking of concrete and a large number of energy absorption and significantly increase the capacity of the concrete crack, the bending strength and bending toughness.In this paper, mechanical and durability properties of polypropylene fiber lightweight aggregate concrete are studied. Mechanical performance test includes the cube compressive strength, elastic modulus, axial compressive strength and flexural strength test. Through tests, the affection law of the polypropylene fiber volume ratio changes to all mechanical properties of lightweight aggregate concrete was analyzed. The results showed that: polypropylene fiber can effectively improve the flexural strength and flexural toughness of concrete and compressive strength has relationship with and the strength grade. Durability tests include the shrinkage test, CL-penetration test, test antifreeze. The experimental results show that, as the quantity of polypropylene fiber increases, all durability of lightweight aggregate concrete are improved. Finally this paper also analyzed the polypropylene fiber for mechanism enhancement of lightweight aggregate concrete and discussed the pull-out model of polypropylene fiber lightweight aggregate concrete.