FATIGUE STRENGTH OF REACTIVE POWDER CONCRETE IN COMPRESSION

摘要

Reactive Powder Concrete (RPC) is a new generation concrete with ultra-high performance. To investigate the fatigue strength of RPC, an experimental program has been carried out to obtain the fatigue-lives of RPC at various stress levels and stress ratios. Twenty four RPC specimens of size 70 mmx70 mmx210 mm are tested under compres-sive fatigue loading. Four static compressive tests are also conducted to determine the static compressive strength of RPC prior to fatigue testing. Concept of equivalent fatigue-life, reported for plain concrete in literature, is applied to RPC to incorporate the effects of stress level S, stress ratio R and survival probability p into the fatigue equation. The results indicate that the statistical distribution of equivalent fatigue-life of RPC is in a-greement with the two-parameter Weibull distribution. The coefficients of the fatigue e-quation have been determined corresponding to different survival probabilities so as to predict the compressive fatigue life of RPC for the desired level of survival probability.