Temperature Field Study of LSAM-50 Flexible Base Asphalt Pavement

Yufeng Bi ¹ Minghao Mu ¹ Mengyu Guo ² Wanyu Wu ² Tingting Ding ³ Chengduo Qian ¹ Deshui Yu ³ Yingjun Jiang ^2* Hongjian Su ²

• ¹ Shandong Hi-speed Group Co., Ltd., Jinan, Shandong Province, China
• ² Chang’an University, Xi'an, Shaanxi, China
• ³ Key Laboratory for Road Structure and Material of Shandong Province, Shandong Academy of Transportation Sciences, Jinan, Shandong Province, China

The research results in recent years show that increasing the aggregate particle size and forming a compact skeleton dense type can effectively control the problem of reflective cracking and improve the rutting resistance of the road, which is one of the ways to extend the life of the pavement.To this end, the group developed a super-large particle size LSAM-50 mix (maximum nominal particle size ≥ 50mm), which has the characteristics of low engineering cost, good rutting resistance, etc., and is expected to realize the goal of long life of asphalt pavement.LSAM-50 pavement temperature field is the basis of the evaluation of the temperature sensitivity of the material, the precise analysis of the mechanical response of the pavement and the rational design of the structure.Asphalt pavement in the light, rainfall, wind and other natural environments under the combined effect, the internal temperature of the continuous cyclic changes, and part of the heat in the direction of the depth of the conduction process is absorbed by the pavement material, so that the pavement structure there is a temperature gradient. Therefore, the result of the coupling of the natural environment, pavement materials and other factors is centrally reflected in the spatial and 2 temporal distribution characteristics of the pavement temperature field. Although there are many studies on pavement temperature distribution law and prediction model at home and abroad, there are significant differences in the temperature distribution of pavements with different structures and materials, and in different regions and terrains.