Abstract: The test results show that the mechanical properties of the recycled material mixtures can be improved by blending fibers. The monofilament polypropylene fiber was used in this experimental study. It was concluded that the optimal fiber content was 0.08% ~ 0.12% by the weight of the recycled mixtures. With the increase of curing age, both the compressive strength and tensile strength of the fiber mixed recycled material samples are improved. The strength in the later stage is significantly higher than that of the samples without adding fibers. From the characteristics of the stressstrain curve, the strength increase is mainly occurred the elastoplastic deformation stage. The results show that the compressive strength of the mixture is about 25% higher than that of the mixture without fibers, and the failure characteristics of the mixture basically conform to the Mohr Coulomb relationship. When the fiber content is within a reasonable range, the shear failure surface increases with the increase of fiber content.

Key words: Fiber Reinforcement, All Recycled Material Mixtures, Strength, Stress and Strain