Experimental characteristics of heat conduction of semi-rigid base asphalt pavement(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2016年05期
- Page:
- 1-7
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Experimental characteristics of heat conduction of semi-rigid base asphalt pavement
- Author(s):
- YAN Xi-li; AI Tao; YOU Qing-long; ZHANG Yi-ru; WANG Li-juan
- 1. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 2. School of Materials Science and Engineering, Chang’an University, Xi’an 710061, Shaanxi, China
- Keywords:
- road engineering; semi-rigid base asphalt pavement; heat conduction; thermal conductivity; experimental characteristic
- PACS:
- U416.217
- DOI:
- -
- Abstract:
- In order to deepen the understanding of the temperature field of semi-rigid base asphalt pavement and its thermo-mechanic characteristics, by using an experimental device in type of double plane samples for heat conduction developed in laboratory applying the Fourier’s law, and by considering the structural characteristics of an accumulational material in great volume, 6 kinds of cement treated aggregates mixture and 4 kinds of bituminous mixtures were studied to measure the thermal conductivity in different temperatures, and to analyze the heat conductive behavior of asphalt pavement. The results show that the thermal conductivity of cement treated aggregates mixture and bituminous mixtures increases linearly with the augment of temperature; the thermal conductivity of dense-graded asphalt layers is 1.03~2.10 W/(m·K), while the thermal conductivity of dense-graded cement treated aggregates layers is 1.03~1.60 W/(m·K), thus bituminous mixture has a better thermal conductive property than cement treated aggregates. Dense-graded mixture is better about 0.33~1.84 W/(m·K) than open-graded under the same temperature condition, which indicates that void ratio of materials is a key impact factor; the thermal conductivity of coarse-grained is larger than that of small-grained in the same base type, demonstrating that the aggregates contribute a lot to heat conduction; the material type is crucial for the thermal conductivity of semi-rigid base asphalt pavement, and the first factor influencing the conductivity for the same material is the void ratio and the second is the grain size, and that the pavement heat conduction is usually in transient state but not in steady state.
Last Update: 2016-10-04