| This test belong to "specification of fiber concrete structure" . In order to overcome the scarcity of tensility , toughness and durability of Layer Steel Fiber Reinforced Concrete(LSFRC) , layer-hybrid-fibers-reinforced-concrete(LHFRC) is offered . Much less steel fibers are evenly distributed on the surface and the bottom about 10mm of the pavement slabs , the middle body of which is composed of polypropylene fiber concrete . This type of new composite material pavement well utilizes the different mechanical behavior of steel fibers and polypropylene fibers. LHFRC has outstanding comprehensive mechanical behavior and cuts the cost.The flexural fatigue behavior of LHFRC was to be examined in this text. After fatigue tests were carried out for 44 stand beams , the following consequences were achieved .1 , Contrasted with LSFRC , the strength of standing dead load of LHFRC are improved above 10.62%. Contrasted with plain concrete , the amount is 22. 6%c2, In this paper , Weibull distribution was used to analyze the fatigue lives for various stress levels and the relationship between stress level P and the cycles N was secured for different survivorship probabilities. Both single-logarithmic and double-logarithmic flexural fatigue equations were regressed .3 , The flexural fatigue equation was contrasted between LSFRC and LHFRC in the same quantity of steel fibers . The influence extent to flexural fatigue behavior of hybrid-fibers was studied .4, The flexural fatigue behavior of concrete is improved effectively though mixed steel fibers and polypropylene fibers .5 , Flexural fatigue mechanism was analyzed . The improving and damaging mechanism were studied .
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