| In recent years, with the increasing of the road traffic and carrying capacity, damages or distress of cement concrete highway appear in different degree. Many pavement structures deteriorated, and the ride quality declines at the same time. Therefore, due attentions should be paid for repair of existing concrete pavement in order to ensure the comfort and the the safety of the driving. In this condition, studying on technology of the existing concrete pavement rehabilitation and the asphalt overlay appears to have an important practical engineering value.The asphalt overlay method will be able to improve the serviceability of cement concrete roads effectively, lengthen their service life, reduce the construction cost and it has a comparatively light impact on the traffic and environment.In the first part, taken a provincial highways as case, the existing cement concrete pavement conditions were evaluated, which includs traffic surveys, pavement distress survey, pavement joint load transfer capability and carrying capacity, investigate road base and sub-base status, then proposed cement concrete pavement rehabilitation alternatives. Second, based on the rehabilitation project of Licheng to Zhongxin ofGuangzhou-Shantou highway (K925+450~K944+700), the application of asphalt overlay and structure of asphalt overlay were proposed. At the same time, the selection of material and the mixture design of the GAC were studied, according to material uses in the similarly projects, which fit Cantonese environment.Finally, the quality control of construction process of asphalt overlay, list the monitoring points of the whole construction process, and make recommendations to correct the inadequacies in order to maintain the quality of construction.In a word, this paper proposed a system method for the evaluation and paving asphalt overlay and quality control. It showed that the mentioned method is effective though the practice. It would supply references to the similar projects. |
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