Marshall test design methods are used to design TLA modified asphalt mixture and base asphalt mixture respectively, and their pavement performance is tested. The results showed that there is a transforming coefficient of 1.15 between OAC of TLA modified asphalt mixture and that of base asphalt mixture, and ultimate gradation of the TLA modified asphalt mixture is finer than previous gradation. TLA modified asphalt mixture has excellent high temperature stability, capacity of moisture-resistance damage and impermeability. So it can be applied to asphalt pavements engineering of expressway in China.
A study is presented to reveal the rule of temperature descent of large stone asphalt mixtures with different design thickness at different ambient temperature through the laboratory simulation test of large stone asphalt mixtures. The results show that the surface temperature dropped rapidly when the surface of large stone asphalt mixtures was in contact with air, then the cooling rate gradually decreased and the temperature difference between the surface and the middle of large stone asphalt mixtures maintained between 15°C and 40°C until the surface temperature dropped to the rolling end temperature. Ambient temperature and design thickness of large stone asphalt mixtures have great influences on its cooling rate.
Marshall test design methods are used to design TLA modified asphalt mixture and base asphalt mixture respectively, and their pavement performance is tested. The results showed that there is a transforming coefficient of 1.10 between optimum asphalt content (OAC) of 25% TLA modified asphalt mixture and that of base asphalt mixture, and TLA modified asphalt mixture has excellent high temperature stability, capacity of moisture-resistance damage and impermeability. Construction technology of TLA modified asphalt mixture is similar to that of ordinary asphalt mixture, but the key for it is to control construction temperature, uniformity and compactness of TLA modified mixture.
Through a large number of laboratory tests,authors study the preparation technology of exposed-aggregate cement concrete pavement, such as the spraying time, spraying dose of exposed-aggregate agent and the flush time. According to the tests results, the spraying time of exposed-aggregate cement concrete declines constantly with the increase of temperature and the appropriate spraying dose of exposed-aggregate agent is determined. The higher the temperature the earlier the flush time. There is a bigger time interval, more than 10h for normal temperature between the earliest and latest flush time.
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