干旱荒漠区水泥稳定砂砾基层干缩、温缩特性分析  

Analysis of dry shrinkage and temperature shrinkage characteristics of cement stabilized gravel base in arid desert area

作　　者：杨三强[1,2] 刘涛 谭忆秋[2] 纪伦[2] 

机构地区：[1]干旱荒漠区公路工程技术交通行业重点实验室新疆交通科学研究院,新疆乌鲁木齐830000 [2]哈尔滨工业大学交通科学与工程学院,黑龙江哈尔滨150090

出　　处：《广西大学学报（自然科学版）》2013年第4期918-928,共11页Journal of Guangxi University（Natural Science Edition）

基　　金：西部交通建设科技项目资助(2011 318 365 600)

摘　　要：针对新疆干旱荒漠区年降水量少,日蒸发强烈,日温差与年温差变化大等特殊气象因素加剧诱发水泥稳定砂砾基层的干缩、温缩裂缝病害现状,以G3012阿克苏至喀什高速公路为依托工程,通过对该工程所用筑路材料进行EDTA滴定实验、电阻应变片测试干缩、温缩应变试验,研究最终提出了借助标准砂分析水泥稳定砂砾的水泥剂量测试方法。电阻应变片测试结果表明,水泥剂量越大,干缩应变就越大,随着失水率的增加,干缩应变逐渐增大,当失水率达到2.4%时,干缩应变增长变缓;温缩应变随水泥剂量和环境温度的降低,逐渐增大,呈线性关系。研究成果对揭示水泥稳定砂砾基层干缩、温缩裂缝诱发机理提供了重要的理论支撑。Aiming at the dry shrinkage and temperature shrinkage cracks of cement stabilized gravel base in Xinjiang arid desert area induced by less annual precipitation, more daily evaporation, seri- ous diurnal and annual temperature change and other special meteorological factors, taking the pro- ject of Aksu to Kashi highway as a research object, the EDTA titration experiments and dry shrink- age and temperature shrinkage strain tests were carried out on the construction materials used in the project. A test method for cement dose of cement stabilized gravel was derived with the standard sand. The strain gauge test results show that the greater the cement dose is, the greater the shrink- age strain is; shrinkage strain increases gradually with the increase of water loss, and the shrinkage strain growth slows down when the water loss rate reaches 2. 4% ; temperature shrinkage strain grad- ually increases with the decrease of cement dose and ambient temperature, and a linear relationship is observed. The experimatal results reveal the mechanism of cracks in cement stabilized gravel base induced by dry shrinkage and temperature shrinkage, providing an important theoretical support forroad engineering.

关 键 词：干旱荒漠区 大温差 水稳基层 干缩特性 温缩特性 

分 类 号：U419.91[交通运输工程—道路与铁道工程]