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GUO Nai-sheng, YOU Zhan-ping, TAN Yi-qiu, ZHAO Ying-hua, WANG Cong. Determination method of optimum asphalt content in asphalt mixture under considering homogeneity[J]. Journal of Traffic and Transportation Engineering, 2017, 17(1): 1-10.
Citation: GUO Nai-sheng, YOU Zhan-ping, TAN Yi-qiu, ZHAO Ying-hua, WANG Cong. Determination method of optimum asphalt content in asphalt mixture under considering homogeneity[J]. Journal of Traffic and Transportation Engineering, 2017, 17(1): 1-10.
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Determination method of optimum asphalt content in asphalt mixture under considering homogeneity

  • 1.

    Institute of Road and Bridge Engineering, Dalian Maritime University, Dalian 116026, Liaoning, China

  • 2.

    Department of Civil and Environmental Engineering, Michigan Technological University, Houghton 49931, Michigan, USA

  • 3.

    School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China

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  • Author Bio:

    GUO Nai-sheng(1978-), male, associate professor, PhD, +86-411-84725602, naishengguo@126.com

  • Received Date: 2016-11-21
  • Publish Date: 2017-02-25
    Abstract
  • In order to determine the optimum asphalt content of asphalt mixture, the inner structure characteristics of components of asphalt mixture were identified by using CT technique.The densities and areas of coarse aggregate, asphalt mastics, and air voids were regarded as characteristic parameters, the homogeneity evaluation index of asphalt mixture was proposed, and the homogeneity evaluation method of asphalt mixture was built.The relationship between the characteristics of inner structure components and the volumetric design parameters in Marshall design method for asphalt mixture was analyzed, the homogeneity of inner structure of asphalt mixture was taken into account, a determination method of optimum asphalt content ofasphalt mixture was established, and three types of asphalt mixtures (AC-13, AC-16, and AC-20) were chosen to verify the method.Analysis result shows that there exists a favorable relationship between the homogeneity evaluation index and the volume of air voids for asphalt mixture, and the volume of air voids with respect to the minimum homogeneity evaluation index is corresponding to the optimal homogeneity of inner structure of asphalt mixture specimen.The difference average value between the volumes of air voids obtained by the homogeneity evaluation method and the values measured by the laboratory density test is 0.28%, the average differences between the voids in mineral aggregate and the voids filled with asphalt computed according to the volumes and the values obtained by Marshall design method are 0.27% and 1.33%respectively, therefore, the volumetric characteristic parameters of components of asphalt mixture considering the homogeneity of inner structure can represent the volumetric design parameters in Marshall design method.The differences of optimum asphalt contents of asphalt mixtures (AC-13, AC-16, and AC-20) determined by Marshall design method and the proposed method are 0.07%, 0.03%, and 0.05% respectively, which means that the proposed method is effective to determinate the optimum asphalt content of asphalt mixture.

     

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