多年冻土区低导热沥青混合料设计与试验研究  

Design and Experimental Research of Low Thermal Conductivity Asphalt Mixture in Permafrost Region

作　　者：钟勇强[1] 黄晓明[2] 马涛[2] 赵永利[2] 

机构地区：[1]淮阴工学院交通学院,江苏淮安223003 [2]东南大学交通学院,江苏南京210096

出　　处：《建筑材料学报》2013年第4期716-719,729,共5页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51008075)

摘　　要：为降低多年冻土区沥青路面吸热传导引起的冻土融沉病害,采用在沥青混合料中填加低导热材料的方法来改变集料导热系数从而降低沥青混合料导热系数.确定沥青混合料的最佳油石比后,在不改变AC-13沥青混合料矿料级配的条件下进行低导热沥青混合料配合比设计,用填加的生蛭石粉(ZS)将原矿料级配中2.36mm以下各档材料进行等质量替代,以保证基本力学性能.采用TCI热物性分析仪对ZS掺量(质量分数,下同)分别为0%,4%,6%,8%及10%的沥青混合料试件进行导热系数的测试.结果表明:沥青混合料试件导热系数随ZS掺量的增加,总体呈指数函数递减趋势;ZS掺量为10%的试件导热系数比未掺ZS试件降低了46.27%,降幅最大,且各项路用性能指标均满足规范要求.In order to reduce the permafrost thaw disease of asphalt pavement caused by heat absorbing and conduction in permafrost regions, the method of filling low thermal conductivity material into the asphalt -mixture was used to change the thermal eonductivity of aggregate and hence to reduce the thermal conductivity of the asphalt mixture. The optimal asphalt-aggregate ratio of the asphalt mixture was determined and then the material composition design for low thermal conductivity asphalt mixture was done without changing AC-13 aggregate gradation. In order to keep the mechanical performance of asphalt mixture, ZS material was used to substitute the aggregate at particle size below 2.36 mm by the same quality. TCI thermal properties analyzer was used for the test in which asphalt concrete specimens with 0 %, 4 %, 6 %, 8% and 10%（by mass）. ZS content（standing for primary mineral of vermiculite） were formed. Test results show that thermal conductivity appears to he exponential function decreasing with the ZS content increasing. Through the thermal conductivity test of asphalt concrete specimens, thermal conductivity drops up to 46.27% at ZS content to be 10%. Its road performance indicators meet specification requirements.

关 键 词：多年冻土区 低导热系数 沥青混合料 材料组成设计 

分 类 号：U414[交通运输工程—道路与铁道工程]