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Shi J.-C.,South China University of Technology | Shi J.-C.,Henan Gaoyuan Maintenance Technology of Highway Co. | Hou S.-G.,Henan Gaoyuan Maintenance Technology of Highway Co. | Li Z.-Y.,Henan Gaoyuan Maintenance Technology of Highway Co. | And 2 more authors.
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | Year: 2014

In order to rapidly detect the permeability coefficient of dense-graded asphalt mixture, a new evaluation approach for pavement permeability coefficient was proposed based on road surface temperature difference. The relationship of asphalt mixture void ratio and permeability coefficient was analyzed. Under the same irradiation conditions the quantities of water lost, water loss rates and surface temperature differences of asphalt mixture specimens with different permeability coefficients were studied by indoor tests. The saturated road surface temperature variation with solar radiation was calculated through numerical simulation. The impact of the season on surface temperature different was analyzed. Also, the numerical results and the indoor test results were compared. The results show that after a period of time under the indoor simulated solar radiation, the surface temperature difference of saturated road gradually increases with the increase of permeability, and the maximum surface temperature difference is 5.7℃. The solar radiation intensity is directly related with the road surface temperature difference. The best evaluation period is between 9:00 AM and 2:00 PM. In summer the road surface temperature difference is the biggest and the summer is the best season to evaluate the permeability coefficient. ©, 2014, Xi'an Highway University. All right reserved.

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