摘要
由于沥青混合料为多相体,其热物理特性参数的测试较为困难.随着对抗车辙等沥青混合料高温特性研究的深入,发现针对沥青混合料导热系数等热物理参数测试方法相关研究很少.基于瞬态热线法,采用TC3000导热系数仪,针对四种典型沥青混合料进行导热系数测试.试验结果分析发现就内部组成因素而言,沥青混合料导热系数随着空隙率增大而减小,随4.75 mm以下细集料通过率增大而减小,随沥青用量增大而减小,但其减小不显著.另一方面,在外部环境变化时,混合料导热系数随温度增加有先减小后增大的趋势,浸水时较干燥时导热系数也提高,压力水平变化对导热系数测试结果影响不大.
It’s difficult to test the asphalt thermal physical parameters because asphalt mixture is a heterogeneous material. Little research work has been done in this area. With the development in asphalt mixture anti-rutting property study, it’s necessary to look for a proper asphalt mixture thermal conductivity coefficient testing method. In this paper, thermal conductivity coefficients of four typical asphalt mixtures are obtained using transient hot line thermal conductivity coefficient testing system, TC3000. These four mixtures have different grade, different asphalt content and different air void ratio. Result analysis shows that thermal conductivity coefficient drops as void ratio increases and thermal conductivity coefficient decreases as fine aggregate passing ratio increases. Thermal conductivity coefficient decreases slightly with increase of asphalt content and it first reduces and then increases when the temperature increases. The coefficient enhances when the mixture is treated with water. Pressure level doesn’t influence the coeffi-cient apparently. Research results can be helpful in the study on pavement temperature field calculation and control.
出处
《西安建筑科技大学学报（自然科学版）》
CSCD
北大核心
2014年第2期199-203,共5页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
河北省交通科技项目(Y-2010090)
陕西省外专局2012择优资助项目
陕西省教育厅专项科研计划项目(12JK0795)
国家自然科学基金项目(51108374)
关键词
道路工程
沥青混合料
导热系数
瞬态热线法
road engineering
asphalt mixture
thermal conductivity
transient hot-wire method
