Analysis of Fatigue Performance and Enhancement Mechanism of Emulsified Asphalt Cold Recycled Mixture
The anti-fatigue cracking performance of emulsified asphalt cold recycled mixture will affect the overall service life of the structural layer.The objective of this study is to evaluate the fatigue performance of emulsified asphalt cold recycled mixture under different reinforcement methods.The four-point bending fatigue test of the beam was carried out on three kinds of cold recycled mixtures,including ordinary emulsified asphalt,basalt fiber and styrene-butadiene rubber(SBR)modified emulsified asphalt.The fatigue equations of three kinds of emulsified asphalt cold recycled asphalt mixtures were established,and the evolution law of dynamic flexural modulus and cumulative dissipation energy during fatigue process was revealed.Scanning electron microscope(SEM)test was used to analyze the micro morphology of fatigue failure interface of emulsion asphalt cold recycled mixture.The test results show that fracture may occur when the dynamic bending tensile modulus decreases to 70％to 80％of the initial modulus.The smaller the dynamic modulus ratio κ,the greater the cumulative dissipated energy,the better the fatigue performance.SBR modified emulsified asphalt and basalt fiber can improve the anti-fatigue performance of emulsified asphalt cold recycled mixture.The mechanism of anti-fatigue performance enhancement of emulsified asphalt cold recycled mixture under fiber reinforcement is revealed by the SEM test.The research results can provide reference for the improvement of fatigue resistance and durability design of emulsified asphalt cold recycled mixture.
万方数据
维普
