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Comparative analysis of perpetual pavement structures based on pavement performance and life cycle cost

Journal of Southeast University(English Edition) 2014年第1期30卷 84-87页

作者：朱玉琴倪富健顾兴宇东南大学交通学院南京210096

pavement performance and economic efficiency are researched on the perpetual test pavement of Yijiang-Suzhou Express Highway in Jiangsu province, China. Test sections were continuously monitored. The conditions and developing laws of deflection, rutting and cracking are compared among the perpetual pavement with the rich binder layer （RBL）, the perpetual pavement without the RBL, and the conventional semi-rigid asphalt pavement in the past eight years after opening for traffic. Economical evaluation is conducted via life cycle cost analysis （LCCA）. Based on the performance comparison and LCCA analysis, sections with the RBL have good crack resistance, but they are not very satisfactory in the aspect of permanent deformation; the conventional semi-rigid asphalt pavement is the least economic one due to requiring more frequent maintenance. Research results show that the perpetual pavement without RBL is a more appropriate structure for the test site.

关键词： perpetual pavement rich binder layer pavementperformance life cycle cost analysis

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Effect of Traffic Speed on Stresses and Strains in Asphalt perpetual pavement

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Journal of Civil Engineering and Architecture 2013年第8期7卷 956-963页

作者： Daba S. Gedafa Mustaque Hossain Stefan A. Romanoschi Department of Civil Engineering University of North Dakota Grand Forks ND 58202-8115 USA Department of Civil Engineering Kansas State University Manhattan KS 66506 USA Department of Civil Engineering University of Texas-Arlington Arlington TX 76019-0308 USA

Increasing traffic volumes and loads as well as public expectation for a long-lasting transportation infrastructure have necessitated designing perpetual pavements. The KDOT （Kansas Department of Transportation） conducted a field trial to investigate the suitability of perpetual pavement concept for Kansas highway pavements. The experiment involved construction of four thick pavement structures. To verify the approach of designing perpetual pavements on the basis of an endurance strain limit, the pavements were instrumented with gauges for measuring tensile strains at the bottom of asphalt base layers at various speeds. pavements were also instrumented with pressure cells to measure stress on the top of subgrade. pavement response measurements under known vehicle load were performed in August 2006. FWD （Falling-weight deflectometer） was also used to collect deflection data at 15 m intervals on the same date. FWD first-sensor （center） deflections were normalized and corrected to 20 ℃ temperature based on measured mid-depth pavement temperature. The result shows that strain and stress measurements show significant amount of variations. Measurements in the thickest section are the most consistent. The higher the traffic speed, the lower the strains and stresses. The difference between strains and stresses at 30 kmhar and 65 km/hr is higher than the difference between 65 km/hr and 95 kin/hr. This shows the effect of speed on stresses and strains decreases as the speed increases. Softer binder in the asphalt base layer results in lower strains, which confirms that softer binder results in higher fatigue life.

关键词： Traffic speed stress strain perpetual pavement deflection.

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