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Investigation on the freeze-thaw damage to the jointed plain concrete pavement under different climate conditions

Frontiers of Structural and Civil Engineering 2018年第2期12卷 227-238页

作者： Shuaicheng GUO Qingli DAI jacob hiller Department of Civil and Environmental Engineering Michigan Technological University 1400 Townsend Drive Houghton MI49931-1295 USA

Freeze-thaw damage is one of the main threats to the long time performance of the concrete pavement in the cold regions. This project aims to evaluate the influence of the freeze-thaw damages on pavement distresses under different climate conditions. Based on the Long-Term Pavement Performance （LTPP） data base, the freeze-thaw damage generated by four different kinds of climate conditions are considered in this project： wet-freeze, wet-non freeze, dry- freeze and dry-non freeze. The amount of the transverse crack and the joint spalling, along with the International Roughness Index （IR/） are compared among the test sections located in these four different climate conditions. The back calculation with the Falling Weight Deflectometer （FWD） test results based on the ERES and the Estimation of Concrete Pavement Parameters （ECOPP） methods are conducted to obtain concrete slab elastic modulus and the subgrade k-value. These two parameters both decrease with service time under freeze condition. Finally, MEPDG simulation is conducted to simulate the IR/development with service year. These results showed the reasonable freeze-thaw damage development with pavement service life and under different climate conditions.

关键词： LTPP elastic modulus k-value IRI MEPDG

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Use ASTM C1260 mortar bar testing to assess the ASR expansion of recycled concrete aggregate

Use ASTM C1260 mortar bar testing to assess the ASR expansio...

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第三届全国再生混凝土学术交流会

作者： Yinghong Qin jacob E.hiller Faculty of Engineering China University of Geosciences Department of Civil and Environmental Engineering Michigan Technological University

＜正＞There has been a reluctance to use RCA in highway infrastructure construction due to RCA’s varying composition and the impact that variation can have on the durability andperformance of the finished *** study examines the ASR（alkali-silica reaction） potential of using recycled concrete aggregate to partially substitute the origin al *** deeply discusses the divergence between the ASTM C1260 test and the laboratory results and analyzes the implication of the divergence on the use of RCA application at transportation infrastructure.

关键词： recycled concrete aggregate(ASR) alkali-silica reaction transportation ASTM C1260

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