The Effect on Flexural Property of Recycled Concrete Beam with Different Mixing Ratio of Silica Fume and Polypropylene Fiber

Abstract

In order to improve the expanding application of recycled aggregate concrete, this paper changes the mixing ratio of silica fume and polypropylene fiber of recycled concrete beam which takes 30% recycled coarse aggregate instead of the natural aggregate, and uses the finite element software ANSYS to analyze the cracking load, ultimate load and load-deflection curves and so on. The results show that: silica fume and polypropylene fiber can improve the flexural property of beam effectively. That is to say, mixing with silica fume can improve the stiffness of beam, but the ductility of beam decreases with the increase mixing ratio of silica fume; mixing with polypropylene fiber can improve the toughness of beam and limit the emergence and expansion of cracks. The result of finite element software ANSYA shows that when mixed with silica fume of 8% and PP fiber of 1%, the flexural property of recycled concrete beam can be improved effectively.