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JIANG Xiao-xia, TAN Run-pu, GAO Wen-yang, SHA Ai-min, CHANG Ming-feng. Gradation fractal characteristic and mechanical indexes of super large stone asphalt mixture[J]. Journal of Traffic and Transportation Engineering, 2013, 13(1): 7-14. doi: 10.19818/j.cnki.1671-1637.2013.01.002
Citation: JIANG Xiao-xia, TAN Run-pu, GAO Wen-yang, SHA Ai-min, CHANG Ming-feng. Gradation fractal characteristic and mechanical indexes of super large stone asphalt mixture[J]. Journal of Traffic and Transportation Engineering, 2013, 13(1): 7-14. doi: 10.19818/j.cnki.1671-1637.2013.01.002
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Gradation fractal characteristic and mechanical indexes of super large stone asphalt mixture

doi: 10.19818/j.cnki.1671-1637.2013.01.002
  • 1.

    Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China

  • 2.

    Hong Kong-Zhuhai-Macao Bridge Authority, Zhuhai 519015, Guangdong, China

  • 3.

    Guangxi Key Laboratory Cultivation Base of Road Structure and Materials, Guangxi Transportation Research Institute, Nanning 530007, Guangxi, China

  • 4.

    The Third Railway Survey and Design Institute Group Corporation, Tianjin 300251, China

More Information
  • Author Bio:

    JIANG Xiao-xia(1976-), female, senior engineer, doctoral student, +86-29-62630058, jxx@hzmbo.com

    SHA Ai-min(1964-), male, professor, PhD, +86-29-62630058, aiminsha@263.net

  • Received Date: 2012-10-18
  • Publish Date: 2013-02-25
    Abstract
  • In order to quantificationally evaluate the gradation characteristic of super large stone asphalt mixture(SLSM), a method was put forward to calculate the aggregate mass fractal distribution function of SLSM based on fractal theory. The values of mass fractal dimension were obtained for SLSM-40 with different gradations, and a relational model between aggregate mass distribution and fractal dimension was established. The relationship between fractal dimension and the volume indexes of SLSM-40 was analyzed, and the mechanical indexes of SLSM-40 were studied by using strength test and simple performance test. Analysis result shows that all the volume indexes of SLSM-40 satisfy technical requirements when fractal dimension is about 2.60. SLSM-40 has good gradation homogeneity when fractal dimension is 2.55-2.60. Cohesion increases with the increase of particle size, and the contribution rate of SLSM-40 cohesion to overall strength is about 50%, which increases by 1-2 times compared with ordinary asphalt mixture, and internal friction angles reduce by 5°-10°. The compression rebound modulus of SLSM-40 increases by 1 869 MPa at 20 ℃, which is 2.6 times compared with AC-25. The dynamic modulus of SLSM-40 increases with the increase of loading frequency at different temperatures, and the change law of phase angle has larger difference compared with that of dynamic modulus at different temperatures and loading frequencies. Dynamic modulus index decreases with the increase of temperature, and the resistance to permanent deformation ability of SLSM-40 declines.

     

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