Abstract: Based on Weibull distribution, the function of coldrecycled base material fatigue life reliability is deduced. The basic parameter of reliability function is determined according to colrecycled material fatigue test results. The coldrecycled base material fatigue life reliability under the function of standard axial load is acquired with relevant calculation formula of asphalt pavement design specifications, and the fatigue life reliability of test road is estimated. The results show that the pure coldrecycled material is suitable for pavement structure of light traffic only, and the equation of fatigue life reliability is applicable and feasible.

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Research on the Relationship between Allowable Tensile Stress and Fatigue Life of Cold-Recycled Material for Pavement Base Layer

Authors: Hai Zhang, Jing Ma, Li Jiao

Abstract: In order to study the changing law of the cold-recycled material between allowable tensile stress and loading number, the relationship between them has been established based on the fatigue equation obtained by fatigue test. The studies indicate that the allowable tensile stress of cold-recycled materials usually decline with the loading number. As for pure cold-recycled material, the decrease of allowable tensile stress is greater than that of added gravel; the cold-recycled material with more gravel content, the decrease of allowable tensile stress is lower than that with less gravel content; the difference of initial allowable tensile stress and initial damage of the material are the main reason for the difference of the change law.

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