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DAI Xue-zhen, JIANG Ying-jun, REN Jiao-long, DONG Guo-jun, SUN Ting-xuan, LIU Gen-chang. CBR particle flow simulation of aggregate and design of coarse aggregate skeleton gradation with strong interlocked force[J]. Journal of Traffic and Transportation Engineering, 2011, 11(3): 10-15. doi: 10.19818/j.cnki.1671-1637.2011.03.003
Citation: DAI Xue-zhen, JIANG Ying-jun, REN Jiao-long, DONG Guo-jun, SUN Ting-xuan, LIU Gen-chang. CBR particle flow simulation of aggregate and design of coarse aggregate skeleton gradation with strong interlocked force[J]. Journal of Traffic and Transportation Engineering, 2011, 11(3): 10-15. doi: 10.19818/j.cnki.1671-1637.2011.03.003
shu

CBR particle flow simulation of aggregate and design of coarse aggregate skeleton gradation with strong interlocked force

doi: 10.19818/j.cnki.1671-1637.2011.03.003
  • 1.

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

  • 2.

    Highway Administration Bureau of Puyang, Puyang 457000, Henan, China

  • 3.

    Highway Administration Bureau of Xuchang, Xuchang 461000, Henan, China

More Information
  • Author Bio:

    DAI Xue-zhen(1974-), male, lecturer, PhD, +86-29-82336048, dxz@chd.edu.cn

  • Received Date: 2011-01-21
  • Publish Date: 2011-06-25
    Abstract
  • California bearing ratio (CBR) test was simulated by using PFC2D, CBR changing laws of single coarse aggregate, synthetic coarse aggregate and coarse-fine combined aggregate were analyzed, a coarse aggregate skeleton gradation with high interlocked force was put forward, and its performances were verified through laboratory test. Test result shows that the main skeleton structure composed of the aggregate with diameter 19-31.5 mm has high interlocked force, and the optimal mass fraction is 50%-70%. The aggregates with diameter 9. 5-19 mm and 4.75-9.5 mm have the effects of filling the void of main skeleton structure and interfering its composing, and the optimal mass fraction of the aggregate with diameter 4.75-9.5 mm is 10%. When the optimum proportion of coarse aggregate to fine aggregate is 65∶35, the CBR value of coarse-fine combined aggregate reaches the highest point, and is more than 540%. The CBR value and compressive strength of the mixture composed of the coarse gradation are over 1.19 times and 1.10 times than that of standard gradation respectively, so the coarse gradation has better mechanical properties.

     

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