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Yin X.-M.,Jiangxi Provincial Expressway Investment Group Co. | Luo S.,Nanjing Southeast University
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2015

According to the long span hybrid girder cable-stayed box girder of Jiujiang Yangtze River Highway Bridge Structure characteristics, the finite element models (FEM) for pavements on steel box girders and steel-concrete combined sections were established using Abaqus software, respectively. The mechanical distributions of pavements under 0.7 MPa and 1.0 MPa tire pressure were calculated. The calculation results for pavement on steel box girder show that the maximal value of transverse tensile stress is more than the one of longitudinal tensile stress, and the maximal value of shear stress happens on the pavement upon the U ribs near the transverse diaphragm. As for the pavement on steel-concrete combined sections, the maximal values of transverse tensile stress, longitudinal tensile stress and vertical displacement appear on the joint surface between the steel-concrete combined section and steel box girder. The values of mechanical control indexes for pavement on steel box girders are significantly greater than those for pavement on steel-concrete combined sections. Research findings provide mechanical calculation basis for the design of pavements on steel box girder and steel-concrete combined sections. © 2015, Beijing Institute of Clothing Technology. All right reserved. Source


Yu W.,Changsha University | Yu W.,Jiangxi Provincial Expressway Investment Group Co. | Zhang X.,Nanjing Southeast University | Zhong K.,Chinese Research Institute of Highway
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2015

To solve the safty problem of driving on the pavement during the winter, the de-icing pavement technology composed of elastic recovery using elastic asphalt binder and lower freezing point using storage salt was proposed, and asphalt mixture with snowmelt agent and high-elastic binder was prepared. The de-icing performance of sample asphalt mixture was evaluated by the designed sponge adsorption experiment and wheel icebreaking test. The finite element models for de-icing of pavement with different thickness of ice layers were established. Testing and simulation results show that the asphalt mixture has best de-icing performance, and can remove ice layer less than 12 mm thick. The findings show that the mixture has good pavement performance and de-icing performance, which can provide a safe pavement technology for driving during the winter. ©, 2015, China University of Mining and Technology. All right reserved. Source


Mei Y.-J.,Chongqing Jiaotong University | Wei H.-G.,China Communications Construction Company Ltd. | Xu J.-P.,Jiangxi Provincial Expressway Investment Group Co. | Fan W.-S.,Jiangxi Provincial Expressway Investment Group Co.
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology | Year: 2013

The load-deformation curves and crack mouth open displacements (CMOD) of mortar were acquired by means of three-point bend test on notched mortar samples. Those mortars are named SBR latex modified cement (with the content of 0~18% SBR, by weight of cement), steel fiber reinforced mortar (with the content of 0~0.9 % steel fiber, by volume of mortar), steel fiber reinforced SBR latex modified cement mortar. Fracture parameters such as efficient crack length (aeff), critical stress intensity factor (KIC s) and crack tip open displacement (CTOD) were obtained from theoretical calculation. The results show that the addition of steel fiber and SBR latex help improve fracture properties of mortar respectively, and the effect may increase the content of the SBR latex and steel fiber. Effect of steel fiber on fracture properties of mortar is superior to SBR latex, while compound addition of SBR latex and steel fiber is superior to employ respectively. Compared with blank mortar, critical load of steel fiber reinforced SBR latex modified cement mortar increased by 32.3%~64.4%, while corresponding deformation increased by 115.8%~209.2%. The descent segment of load-deformation curves for steel fiber reinforced polymer mortar falls gently, and there even appeared a secondary peak load. The adoption of CTOD in appraising the effect of SBR latex and steel fiber on the fracture performances of mortar is more efficient than fracture energy, aeff, KIC s and CMOD. Source


Zhou Z.-G.,Changsha University | Li S.-S.,Changsha University | Liu X.-G.,Changsha University | Yu W.-S.,Changsha University | And 3 more authors.
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | Year: 2016

In order to investigate the influence of dynamic water erosion on the performance of asphalt mixtures, the tests of dynamic water erosion on SMA-13 mixture samples with different porosities by using a self-developed dynamic water erosion test device were taken, and the changes of parameters such as permeability coefficients, compressive strength, indirect tension strength and mass were compared before and after dynamic water erosion. By reference to the standard of water stability evaluation on asphalt mixtures in the Technical Specifications for Construction of Highway Asphalt Pavement, the evaluation indexes and their standard values of anti-erosion performance of asphalt mixtures were suggested based on the ratio of compressive strength and indirect tension strength before and after dynamic water erosion. The results show that the dynamic water erosion shows negative effect on the performance of asphalt mixtures, and the effect varies with different porosities, the compressive strength and indirect tension strength decrease with the increase of porosity. For the SMA-13 mixtures with around 8% porosity, the influence of dynamic water erosion on its degree of attenuation is the greatest. The mixture's permeability coefficients increase slightly after it is eroded by dynamic water. Moreover, with the increase of porosity, the mass loss increases with a gradually slower growth rate. © 2016, Editorial Department of China Journal of Highway and Transport. All right reserved. Source

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