AC-20 Gradation Optimization Based on Uniaxial Penetration Test

GAO Zhen-xin, LI Qiang, JIANG Ying-jun, LIU Gen-chang

China Journal of Highway and Transport ›› 2017, Vol. 30 ›› Issue (4) : 24-31.

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China Journal of Highway and Transport ›› 2017, Vol. 30 ›› Issue (4) : 24-31.

AC-20 Gradation Optimization Based on Uniaxial Penetration Test

  • GAO Zhen-xin1, LI Qiang2, JIANG Ying-jun2, LIU Gen-chang3
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Abstract

In order to improve the road performance of asphalt mixture, a numerical uniaxial penetration test method of asphalt mixture was established by the particle flow software PFC2D. The simulation method of the asphalt mixture numerical uniaxial penetration test conditions and the parameters of the model were described. The reliability of this method was verified by AC-20 indoor uniaxial penetration test in the practical engineering. Three different model parameters were selected by different raw materials. Influence law of model parameters, coarse aggregate gradation, fine aggregate gradation and coarse aggregate ratio on shear strength of asphalt mixture were investigated on the basis of numerical uniaxial penetration test. Finally, the optimum pass rate range of the key sieve was determined by the indoor uniaxial penetration test. The AC-20 aggregate gradation with the maximum shear strength was proposed, and its road performance was verified. The results show that the simulation curves of uniaxial penetration strength are basically consistent with the measured curves of indoor test. The model parameters of the numerical uniaxial penetration have no effect on the proportion of aggregate in the maximum shear strength. The ratio of coarse aggregates of 19-26.5 mm, 16-19 mm, 3.2-16 mm, 9.5-13.2 mm and 4.75-9.5 mm is 3:12:5:10:10. When the I value of fine aggregate gradation is 0.75, the proportion of coarse aggregate and fine aggregate is 60:40 with maximum shear strength of asphalt mixture. It is suggested that the pass ratios of AC-20 asphalt mixture gradation of 9.5 mm, 4.75 mm, 2.36 mm and 0.075 mm are 50%-60%, 34%-44%, 31%-37% and 3%-7% respectively. Compared with the standard grade, the shear strength and the dynamic stability of the AC-20 mixture with gradation optimization increase by 25% and 27% respectively.

Key words

road engineering / gradation optimization / numerical test / asphalt mixture / particle flow

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GAO Zhen-xin, LI Qiang, JIANG Ying-jun, LIU Gen-chang. AC-20 Gradation Optimization Based on Uniaxial Penetration Test[J]. China Journal of Highway and Transport, 2017, 30(4): 24-31

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