Abstract

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Title:: Analysis of temperature field of asphalt pavement by site measurement in full-depth

Author(s):: YAN Xi-li; ZHANG Shi-ping; LI Yan; HU Xiao-yuan; 1. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Sichuan Guang-Ba Motorway Company, Chengdu 610041, Sichuan, China

Keywords:: road engineering; asphalt pavement; temperature field; full-depth; all weather; site measurement

Abstract:: To study the temperature field of asphalt pavement, lots of temperature sensors were buried between each construction structure layer from the top of roadbed during the pavement Construction of a motorway. A great databank about pavement temperature was founded after two consecutive years measurement by a data-acquisition central, which permitted an analysis on the periodic variation of asphalt pavement temperatures. The surface temperature of pavement was determined by numerical simulation, and so a whole temperature field in full-depth of pavement structure was drawn, which permitted an analysis on the variation tendency of asphalt pavement temperature field in high, low and normal temperatures. The results show that the temperature of asphalt pavement varies periodically, and the day-periodic variation is the most remarkable. The temperature variation occurs principally in asphalt layers but no great variation below the top of pavement base. The surface maximal temperature of this pavement may take at 62 ℃ in summer, and be superior of 22 ℃-24 ℃ to the air temperature. The temperature of asphalt pavement increases linearly with the depth of pavement at low temperatures, and decreases exponentially or poly-linearly at high temperatures, and varies alternately at normal temperatures period.