Research Of Bending Fatigue Life Of Reactive Powder Concrete (RPC)

Reactive Powder Concrete(RPC) is a kind of serviceable mixture of concrete with high performance, good ductility and stability which is invented in 1990s. The RPC displays excellent granular compactness, and its low water content helps reduce porosity. This results in an excellent resistance to the penetration of aggressive agents, and structures and components with RPC are expected to significantly outlast those built with ordinary concrete.In this paper, on the base of the comprehensive analysis of the most up-to-date development of Reactive Powder Concrete (RPC) in domestics and abroad, in terms of the practical condition and the using of the common material in Fuzhou, RPC with excellent mechanics performance and durability is successfully prepared. The breakage caused by the fatigue load not only influenced but also did harms to the safety and normal use of constructions, so we discussed the effects of fatigue load on RPC. According to different proportion of fibre in RPC, we imposed fatigue load on specimens by the Instron testing machine, and then got their fatigue lives. Based on the experiments, fatigue life distribution of RPC is studied using fatigue life statistics theory, the fatigue life equation is established.The study results in the paper can be conclude that the bending strength and fatigue life of RPC with steel fibre are much higher than those of plain RPC. The bending fatigue life of RPC can be described by two parameter Weibull distribution. I gained the relation between livability and fatigue life, and then drew the P-N curve. Compare the P-N curve of two parameter Weibull distribution with that of three parameter Weibull distribution, some differences between them are found. So we should choose the appropriate method to obtain the fatigue life of structure or component.