Polypropylene Fiber Reinforced Self-compacting Concrete Research And Engineering Application

Polypropylene fiber reinforced self-compacting concrete is a new compositematerial in concrete engineering. Because of its excellent working performance, it hasbeen widely used in concrete engineering. The polypropylene fiber reinforcedself-compacting concrete described in this paper is made of two materials which arehigh fluidity self-compacting concrete and polypropylene fiber. Therefore, it can alsoplay their respective advantages of both materials. On the one hand, it can remainself-compacting concrete mixture characteristics (vibration-free, high fluidity, easysegregation, realize remote super high pumping requirements). On the other hand, itcan make self-compacting concrete early shrinkage, good crack resistance toughening,etc. Furthermore, it can improve splitting tensile strength, flexural strength and othermechanical properties significantly. With this excellent performance, polypropylenefiber reinforced self-compacting concrete is more in line with the new buildingmaterials of high performance concrete requirements.With referring and summarizing large amounts of the relevant literature, we cancalculate the basic mix ratio of the polypropylene fiber reinforced self-compactingconcrete. By the trial test, we can optimize the basic mix ratio which meets therequirements of self-compacting working performance, such as fluidity, cohesiveness,etc. In this paper, we study the high volume (0.15%) and different slenderness(9mm~15mm) polypropylene fiber reinforced self-compacting concrete. First, westudy the influence of the working performance (fluidity, cohesiveness and obstacleclearance through ability). Secondly, we study the influence of the physical andmechanical properties (early shrinkage, cracking, compressive strength, compressivemodulus of elasticity, splitting tensile strength, flexural strength and adhesive strengthbetween steel bar and polypropylene fiber reinforced self-compacting concrete). Theresults show that this material has a high application value in Engineering. Throughthe flexural experiment of the polypropylene fiber reinforced self-compactingconcrete beam, we study the cracking load, the carrying capacity, the deformabilityand the failure mode under serviceability limit states and ultimate limit states. Theresults indicate that its cracking load was significantly increased, and provide areliable reference to practical application.