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The Influential Factors of semi-flexible pavement Cracking Performance

Journal of Wuhan University of Technology(Materials Science) 2022年第5期37卷 953-962页

作者： XIONG Zijia GONG Minghui HONG Jinxiang DENG Cheng Jiangsu Sobute New Materials.Co.Ltd Nanjing210000China State Key Laboratory of High Performance Civil Engineering Materials Nanjing210000China

The cracking performance of semi-flexible pavement(SFP) was investigated by using the semi-circular bending(SCB) test in this paper. Thirteen grouting slurries were prepared. The compressive strength of these materials ranges from 3 to 100 MPa. The relationship between the compressive strength of the grouting slurry and the cracking property of SFP was obtained at different loading rates and different temperatures. The peak load, fracture energy(E), flexible index(FI), and cracking resistance index(CRI) were calculated to determine the material performance. The results show that the compressive strength of the grout influences the cracking behavior. With a higher comprehensive strength grouting slurry, the FI value of SFP decreased initially and then increased slightly at 25 ℃ in 50 mm/min. The CRI value decreased at the same time. E values changed just according to the test temperature and loading rate. The damage paths of SFP are different. The damage path of the SFP sample appears as diffuse damage at 1 mm/min at 60 ℃ or clean damage at 50 mm/min at 25 ℃. These findings indicate that there is a correlation between the compressive strength of grouting slurry and SFP cracking behavior. The cracking form is influenced by loading rate and temperature.

关键词： semi-flexible pavement cracking performance SCB grouting slurry compressive strength

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Mechanical Behavior and Failure Mechanism of Recycled semi-flexible pavement Material

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Journal of Wuhan University of Technology(Materials Science) 2015年第5期30卷 981-988页

作者：丁庆军 ZHAO Mingyu SHEN Fan ZHANG Xiaoqiang State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology School of Materials Science and Engineering Wuhan Institute of Technology School of Transportation Wuhan University of Technology

The mechanical behavior and failure mechanism of recycled semi-flexible pavement material were investigated by different scales method. The macroscopic mechanical behavior of samples was studied by static and dynamic splitting tensile tests on mechanics testing system(MTS). The mechanical analysis in micro scale was carried out by material image analysis method and finite element analysis system. The strains of recycled semi-flexible pavement material on samples surface and in each phase materials were obtained. The test results reveal that the performance of recovered asphalt binder was the major determinant on the structural stability of recycled semi-flexible pavement material. The asphalt binder with high viscoelasticity could delay the initial cracking time and reduce the residual strain under cyclic loading conditions. The failure possibility order of each phase in recycled semi-flexible pavement material was asphalt binder, reclaimed aggregate, cement paste and virgin aggregate.

关键词： semi-flexible pavement RAP recycling technology failure mechanism mechanical behavior

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Study on Air-Purifying Performance of semi-flexible Asphalt Samples Coated with Titanium Dioxide Using Different Methods

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Journal of Renewable Materials 2022年第5期10卷 1321-1335页

作者： Shoujing Yan Yangyang Wang Fengxia Chi Xue Luo Tianjie Zhang Chenchen Xi Institute of Road Engineering Zhejiang Scientific Research Institute of TransportHangzhou310023China Department of Architecture and Civil Engineering Zhejiang UniversityHangzhou310027China Department of Computer Science Boise State UniversityBoise83725-1145USA

Titanium dioxide(TiO_(2))was recently employed to apply onto road surfaces to degrade the harmful compounds from vehicle ***,it remains a challenging task to find a highly compatible pavement type for TiO_(2)application to achieve durable and efficient air-purifying *** study proposed to coat TiO_(2)particles onto semi-flexible pavement surface and tried to investigate an optimum coating *** coating methods,including direct mixing TiO_(2)(MT)with asphalt mixture,spraying dry TiO_(2)(ST)coating and watersolution-based TiO_(2)(WT)coating on semi-flexible pavement *** achieve this objective,semi-flexible samples were prepared to evaluate and compare the performances of three coating methods by employing resistance to wearing,NO removal efficiency tests and residual texture depth *** was found that the ST method not only provided better NO degrading efficiency but also improved the resistance to wearing than the other two methods.

关键词： Titanium dioxide air-purifying performance semi-flexible pavement coating methods

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Development of high stability hot mix asphalt concrete with hybrid binder

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Journal of Traffic and Transportation Engineering(English Edition) 2014年第6期1卷 424-431页

作者： Toshiaki Hirato Masato Murayama Hirotaka Sasaki Toa Road Corporation TsukubaIbarakiJapan Kao Corporation SumidaTokyoJapan

Cost reduction of public works projects has been desired due to severe financial circumstances. Therefore, asphalt pavement has been requested to extend its life. semi-flexible pavement or epoxy asphalt pavement, which has high rutting resistance and oil resistance, may be applied to the place where these performances are demanded. However, special technique is required in manufacturing and construction. In addition, these materials have also raised a problem that they cannot be recycled. Meanwhile, conventional asphalt pavement has several drawbacks. It is vulnerable to rutting caused by traffic load and damage caused by petroleum oils such as gasoline or motor oil. The materials used in asphalt mixtures were studied for improving the durability of asphalt mixture. A high stability asphalt concrete was developed which has equal or superior performance to semi-flexible pavement and epoxy asphalt pavement. In this paper, the process of selecting the substance and the characteristics evaluation of the developed mixtures are described. Furthermore, an inspection result as well as follow- up survey of the performance of the developed mixtures obtained from trial and actual construction is shown.

关键词： hot mix asphalt rutting resistance oil resistance semi-flexible pavement epoxy asphaltpavement

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