| dc.description.abstract | In Taiwan, highway pavement repair usually carry out at night in order not to influence the heavy traffic at daytime, and engineers should make the traffic open to public use before 6:00 am. Owing to work at night time, the pavement temperature changes rapidly, thus influence the development of structural strength. Furthermore, the curing time is not sufficient because of open up traffic earlier. These will cause unfavorable influences on pavement such as crack, rutting and shear failure. Therefore, research the best occasion to open traffic on overlay engineering, inclusive of on-site measurement and laboratory test are quite necessary.
The on-site measurement data inclusive of temperature changing curve and material stiffness. The data is from provincial highway No.21, 60k, Nantau(DGAC); national highway No.1, 333k, Tainan(DGAC); national highway No.3, northern 94k, Xinzhu(SMA), and northern 132k(PA). Laboratory samples are taken from the construction site. Experiments are temperature changing curve measurement and material mechanic analysis, it should be notice that the temperature is simulate as the construction site. Combine data both from on-site and laboratory, by using multi-layer theory and analyzing data from rutting experiment, we can obtain the best curing time and pavement temperature while open traffic.
Result shows that, the best occasion of SMA: pavement temperature lower then 70℃,curing time should more then 100 min.; best occasion of PA: pavement temperature lower then 70℃, curing time more then 60 min.; best occasion of DGAC: pavement temperature lower then 60℃, curing time more then 150 min. We can notice that using of polymer modified asphalt can sufficiently resolve the problem caused by shutting traffic. | en_US |