Experimental Research On Uniaxial Tensile And Flexural Behavior Of PP Fiber Reinforced Concrete

The fibers added into concrete can enhance the tensile properties of concrete, leading to a fiber reinforced concrete (FRC). Fibers can improve the crack resistance ability and the toughness of concrete by resisting the emergence and development of the internal microcracks in concrete. The most widely used FRC at present is steel fiber reinforced concrete.Conventional polypropylene (PP) fiber belongs to micro-fiber which can be used to reduce shrinkage cracks of concrete at early age. As the development of the technique of PP fiber reinforced concrete and the improvement of the quality of PP fiber, people have attempted to add macro-PP fiber into concrete for the purpose of enhancing the toughness of concrete.In this theis, the author investigated the bending and uniaxial tensile behavior of PP fiber reinforced concrete. The bending test was according to the guideline of ASTM.There were no test guildlines for uniaxial tensile test. In the present study, based on different direct tensile test methods of concrete in the present studies, the effects of specimen shape and grip method on the stress distribution in specimen were discussed and a series of tests were carried out by using epoxy adhesive method. Influences of fiber content and fiber type on tensile strength, tensile strain and residual strength of concrete have been studied...