| As a major distress for cement concrete pavement, joint faulting is a main event for pavement maintenance. It can accelerate the pavement's structural damage, increase the road's application costs, then significantly reduce the pavement roughness and ride quality. So it is necessary to research the causes of slab faulting, detecting methods of joint faulting, evaluation criterion for faulting treatment measures, and the correlation between the joint faulting and pavement roughness. These researches can help the traffic departments to choose the time and method for certain faulting treatment measures. Such goals as enhancing the ride comfort, extending the pavement's longevity and reducing the operation costs will be achieved at last.After surveying the Xia-Fen expressway in Shanxi province and several expressways in Guangxi province, the truth that joint faulting is a major distress for cement concrete pavement has been found out. When collecting analyzing the relevant data of the expressways mentioned above was finished, the correlation model between the length of joint faulting per kilometer and the pavement's longevity was established reasonably.Based on the analyzing on the reasons which caused the early distress, the factors causing the faulting can be summarized as follows: design and construction, environment, axle-bearing and traffic volume.Two typical pavement sections were chosen, the faulting values and Local Roughness Index of the represent cement concrete pavement were detected, then the relationship model between the faulting values and local roughness Index were established. With achievements mentioned above, the grading standard of faulting values based on the ride quality can be obtained, and a new method for detecting faulting values is offered in this paper.Besides, the treatment measures for each level of the joint faulting can be found in this paper, and void distress of two pavement sections chosen in Chongqing City is cured by mud jacking. |
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