Experimentation On The Flexural Fatigue Behavior Of Layer Steel Fiber Reinforced Concrete Pavement

Layer steel fiber reinforced concrete(LSFRC) of pavement is a new composite pavement material which both cherishes the reinforcement of steel fibers to the concrete and cuts the costs. Much less steel fibers are evenly distributed on the surface and at the bottom of the pavement slabs, the middle body of which is composed of plain concrete. In this way, the fragile parts are fortified. It proves effective and economical by experiment and field application.As the study was performed successfully in the previous stage concerning the fold strength, the flexural fatigue behavior was to be examined for this concrete. Fatigue tests were carried out for 70 small-scale beams (55 LSFRC beams and 15 plain concrete beams). The evolvement of fatigue strain and damage with cycles was discussed and the influence of steel fibers and the stress level on the fatigue strain and damage was analyzed. In this paper, two-parameter Weibull distribution was used to analyze the fatigue lives for various stress levels and the relationship between stress level S and the cycles N was secured for different non-survivorship probabilities, namely P-S-N figures. Both single-logarithmic and double-logarithmic fatigue functions were regressed for various non-survivorship probabilities. In the end, the fatigue wastage coefficient was derived and the reference values of the calculation parameters were given to determine the fatigue wastage coefficient for different non-survivorship probabilities.