水泥稳定碎石基层混合料的膨胀性分析  

Swelling Analysis of Cement Stabilized Macadam Mixture

作　　者：姚爱玲[1] 韩方元 许敏 王军伟 于少勇 YAO Ai-ling;HAN Fang-yuan;XU Min;WANG Jun-wei;YU Shao-yong(Key Laboratory of Highway Engineering in Special Region of Ministry of Education, Chang'an University, Xi'an 710064, China;Inner Mongolia Alxa League Traffic Investment Co. , Ltd. , Alashan Zuoqi 750306, China;Xi'an Branch, Shanghai General Institute of Political Design and Research (Group) Co. , Ltd. , Xi'an 710064, China)

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,西安710064 [2]内蒙古阿拉善盟交通投资有限公司,阿拉善左旗750306 [3]上海市政设计研究总院(集团)有限公司西安分公司,西安710064

出　　处：《科学技术与工程》2020年第12期4902-4908,共7页Science Technology and Engineering

基　　金：国家自然科学基金(51408043)。

摘　　要：内蒙古阿拉善盟沙漠戈壁地区,年温差、日温差很大,不同等级的道路均出现了因水稳碎石基层膨胀引起的沥青路面横向隆起现象,严重影响道路的使用性能与行车安全。为分析影响水稳碎石基层膨胀的因素,基于该地区的气候和水文地质条件,设计了一系列的水稳碎石混合料涨缩试验。结果表明:影响膨胀性的主要因素为级配类型、水泥剂量和养生龄期,而硫酸盐含量对膨胀性基本没有影响;水稳碎石混合料是温度敏感性材料,当温度由10℃开始,升至40~50℃时,混合料的膨胀系数达到最大;当温度由上升变为下降时,产生的收缩总变形比膨胀总变形要大,因此在沙漠戈壁地区的水稳碎石基层沥青路面,不仅在升温过程中易产生路面隆起,在冬季也容易产生低温开裂。In the desert Gobi area of Alxa League,Inner Mongolia,both the annual temperature difference and the daily temperature difference are very large.The transverse uplift swelling of asphalt pavement caused by the expansion of cement stabilized macadam base appears on different grades of roads,which seriously affects the road performance and driving safety.In order to analyze the factors affecting the expansion of cement stabilized macadam base,a series of experiments of expansion and shrinkage of cement stabilized macadam mixture were designed based on the climate and hydrogeological conditions in this area.The study shows that the main factors affecting expansibility are gradation type,cement dosage and curing age,while sulfate content has no effect on expansibility.The cement stabilized macadam mixture is a temperature sensitive material.The expansion coefficient of the mixture reaches the maximum when the temperature rises from 10℃to 40~50℃.When the temperature changes from rising to falling,the total shrinkage deformation is larger than the total expansion deformation.Therefore,in the Gobi Desert area,the cement stabilized macadam base asphalt pavement is prone to low temperature cracking in winter and pavement uplift in the process of heating.

关 键 词：水稳碎石混合料基层 沥青路面 横向隆起开裂 拱胀 膨胀系数 

分 类 号：U416.217[交通运输工程—道路与铁道工程]