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Gu X.,Nanjing Southeast University | Xu T.,Jiangsu Zhongshe Engineering Consultancy Group Co | Ni F.,Nanjing Southeast University
Journal Wuhan University of Technology, Materials Science Edition | Year: 2014

The characters of basalt fiber are analyzed and compared with commonly used fibers. The rheological behaviors of the basalt fiber reinforced asphalt mastic are investigated by the dynamic shear rheological tests and the repeated creep tests. The results show that basalt fiber has excellent reinforced performances, such as high asphalt absorption ratio, low water absorption ratio, high tensile strength, high elastic modulus and high temperature stability. The rutting factor of the fiber reinforced asphalt mastic is higher than the plain asphalt mastic and the reinforced effects are more remarkable under high temperature. The rheological performances of the asphalt mastic demonstrate a good linear relationship between different temperature and loading frequency. The creep stiffness modulus of the asphalt mastic at different loading time can be expressed by power function. Improved Burgers model is used to represent the rheological behaviors of the asphalt mastic with basalt fiber and the model parameters are estimated. © 2014, Wuhan University of Technology and Springer-Verlag Berlin Heidelberg. Source


Sun X.-Y.,Zhejiang University | Dong W.-W.,Zhejiang University | Dong W.-W.,Jiangsu Zhongshe Engineering Consultancy Group Co | Wang H.-L.,Zhejiang University | Wang J.,Stanford University
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | Year: 2012

In order to control and reduce the environmental impact of infrastructure construction, so as to promote the low-carbon maintenance and management of bridge engineering, a carbon emission calculation model was proposed on basis of the multiplex maintenance strategy for existing bridge. The carbon emission was converted into current cost so as to establish a synthesized bridge life cycle cost system with consideration of economic and environmental impacts then the bridge maintenance strategy was decided through optimization analyses. A case study for an existing bridge which has been in an active service for 25 years was carried out, and the analytical result shows that the method developed in this paper combines the carbon emission quantitative analysis with maintenance decision-making optimization, which agrees well with the bridge maintenance process. It has certain reference value for bridge maintenance management. Source


Ling T.-Q.,Chongqing Jiaotong University | Wang Y.-Y.,Chongqing Jiaotong University | Liu Y.-Y.,Chongqing Jiaotong University | Zhu Y.,Jiangsu Zhongshe Engineering Consultancy Group Co | Liao F.-L.,Jiangsu Zhongshe Engineering Consultancy Group Co
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2012

Based on the functional principle, fiber sealing layer material mix design parameters were analyzed in this paper, aiming at the problem that the control of the fiber sealing layer material mix design mainly depends on empirical method. According to the calculation of adhesive work, strain energy, thermal energy loss, the best fiber was chosen from four. At the same time, the concept of rupture surface was put forward, getting the ratio between the amount of fiber and asphalt emulsion content, and the relationship between the fiber length and sealing layer performance was further discussed. The result shows that composite modified glass fiber D whose rupture radius is 0.83 mm is the best while the ratio between the theoretical fiber and asphalt emulsion content is 1:11.919 and fiber theory length is 72 mm. Source


Sun Y.-Y.,Jiangsu Zhongshe Engineering Consultancy Group Co | Ji D.-P.,Jiangsu Transportation Research Institute | Xiao Z.-B.,Yangzhou University
Jiaotong Yunshu Xitong Gongcheng Yu Xinxi/Journal of Transportation Systems Engineering and Information Technology | Year: 2013

Transport infrastructure is one of the important influences on urban size. In certain stage of urban involution, status of transport infrastructure always indicates the size of urban area. This paper will do research into the relationship between transport infrastructure and urban involution; quantify indicators such as layout and scale of transport infrastructure, node compatibility and accessibility. Then based on the consideration of economic development towards urban size, the model about relationship between transport infrastructure and urban size is structured, and part of parameters is evaluated. Finally, it takes Shuyang as an example, researches the reasonable urban size under the established scale of transport infrastructure, and compares with its current size. Source


Sun X.-Y.,Zhejiang University | Dong W.-W.,Jiangsu Zhongshe Engineering Consultancy Group Co | Wang H.-L.,Zhejiang University | He S.-Q.,North China University of Technology
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | Year: 2013

To investigate the long-term performance of existing bridge girders strengthened with fiber reinforced plastics (FRP) sheets and subjected to erosion environment, the bearing capacity and service performance experiments of 11 reinforced concrete (RC) girders, which were strengthened with carbon fiber reinforced plastics (CFRP) and basalt fiber reinforced polymer (BFRP) sheets after initial corrosion damage, were conducted. Different subsequent performance degradations for strengthened girders were simulated through electrochemical accelerated corrosion together with wet/dry cycles of salt solution. The effect of environmental erosion on capacity, stiffness and other parameters of CFRP/BFRP strengthened girders in different follow-up service time was tested. The durabilities and costs of the two strengthening materials were also investigated. The results show that the capacity evaluation of bridge girders strengthened with FRP sheets should consider the effect of rebar corrosion together with the environmental reduction of FRP strengthening; the CFRP strengthening improves the stiffness obviously but BFRP strengthening shows better ductility; when considering long-term performance, CFRP sheets strengthening provides better durability while BFRP strengthening displays better cost effectiveness. Source

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