Papers by Author: Jing Ma

Abstract: In this paper, we present the fatigue equation through the bending fatigue test which is loaded at the three dividing point on the beam specimen and by using the two-parameter we calculate distraughtly the probability distribution of the fatigue life of cold recycling materials. we analysis the mechanism of fatigue damage by analyzing the microscopic composition of the cold recycled materials. The results show that anti-fatigue performance and fatigue life to the stress sensitive degree of cold recycled materials, while in condition of high stress ratio, the content of gravel has limited impact on fatigue performance of cold recycled materials.

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.