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Variation ratio of dissipated energy of fatigue failure for porous asphalt mixture(PDF)


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Variation ratio of dissipated energy of fatigue failure for porous asphalt mixture
LI Xiao LIANG Nai-xing BAI Hong-tao CHENG Zhi-hao ZHAO Xiao-jie
1. National Engineering Laboratory for Surface Transportation Weather Impacts Prevention, Broadvision Engineering Consultants, Kunming 650041, Yunnan, China; 2. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China; 3. Yunnan Research Institute of Highway Science and Technology, Kunming 650051, Yunnan, China
road engineering porous asphalt mixture strain control variation ratio of dissipated energy plateau value failure criterion
In order to provide the research basis for evaluation of long term performance of porous asphalt pavement, this paper studied the fatigue performance of porous asphalt mixtures with high viscosity modifier. Two kinds of aggregate types for porous asphalt mixture with high viscosity modifier were studied through four-point bending trabecula fatigue test under different strain levels, and the process of fatigue failure of mixture was analyzed based on the attenuation of stiffness modulus and dissipated energy method. The curve jump point of dissipated energy variation ratio at each cycle stage was employed to make the failure criterion for mixtures, and the fatigue life predication model was established, which including the parameters of the plateau value (PV) of variation ratio of dissipated energy and volume parameter of mixtures. The results show that the attenuation status of stiffness modulus of porous asphalt mixtures with high viscosity modifier still stays at stable stage when it failures under strain control mode, is inapplicable as the criterion for fatigue failure of this material. There is a good relativity between traditional accumulated dissipated energy and fatigue life shows a little dispersion, it can not demonstrate the energy variation in the damage process at low strain level. However, the variation curve of dissipated energy can clearly reflect the damage process of the three stages during repeated loading fatigue. The variation ratio of dissipated energy at stable stage reveals that the energy needed by the damage of material itself during energy transformation has a fixed ratio in the whole damage process. The plateau value of variation ratio PV demonstrates the capacity of materials against the fatigue failure, and has a good relation of power function with fatigue life. The established fatigue life prediction model can reflect the nature of fatigue failure of materials and its fitting result has a higher correlation coefficient.



Last Update: 2017-07-17