This paper presents the results of an experimental and analytical investigation to determine the flexural fatigue strength and endurance of non-metallic (polyolefin) fiber reinforced concrete. Six different polyolefin FRC mixes with varying compressive strengths were investigated. The FRC beams were subjected to flexural fatigue with third point loading at a frequency of 25 load cycles per second. It was found that polyolefin fiber reinforced concrete reaches an endurance limit at about two million cycles. The fatigue life model (S-N curve) was more accurate when presented on a log-log scale than on a log-normal scale. Statistical and probabilistic concepts are introduced to predict the flexural fatigue model and the fatigue life expectancy of the composite. A multiple regression model has been formulated to generalize the fatigue life model to encompass all compressive strength ranges. The non-linear multiple regression equation can be used to predict the fatigue life of polyolefin FRC with any compressive strength, at a given stress level.
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