水泥乳化沥青混合料施工和易性评价方法及影响因素  

Evaluation method and influencing factors for construction workability of cement-emulsified asphalt mixture

作　　者：张翠红[1] 焦生杰[1] 曹学鹏[1] 闫玉奎 陈小雪 齐彦秋[1] ZHANG Cui-hong;JIAO Sheng-jie;CAO Xue-peng;YAN Yu-kui;CHEN Xiao-xue;QI Yan-qiu(Highway Maintenance Equipment National Engineering Laboratory, Chang＇an University, Xi＇an 710064, Shaanxi, China;Henan Gaoyuan Maintenance Technology of Highway Co. Ltd. , Xinxiang 453003, Henan, China)

机构地区：[1]长安大学公路养护装备国家工程实验室,陕西西安710064 [2]河南高远公路养护技术有限公司,河南新乡453003

出　　处：《长安大学学报（自然科学版）》2018年第1期41-48,共8页Journal of Chang’an University(Natural Science Edition)

基　　金："十二五"国家科技支撑计划项目(2015BAF07B08);陕西省自然科学基础研究计划项目(2017JQ5034)

摘　　要：为了研究水泥乳化沥青混合料的施工和易性及其对压实性能的影响,基于沥青表面自由能理论,采用拌和扭矩表征该混合料的施工和易性。通过拌和和易性测试设备和旋转压实仪分别测定混合料的拌和扭矩和压实性能。通过抗压强度极差分析法确定常温下混合料的最优配合比方案,提出该混合料的拌和和易性评价方法及影响因素;根据拌和状态和拌和扭矩值确定10℃、25℃、40℃时混合料的最佳含水率与拌和时间的推荐值,并分析3种温度下不同摊铺模拟初压次数时的摊铺和易性对压实性能的影响。研究结果表明:含水率对混合料的拌和和易性有显著影响,10℃、25℃、40℃时的最佳含水率(质量分数)分别为5.25%、6%、6.5%,3种温度下混合料的推荐拌和时间均为12s;整体上随着温度的增加,试件空隙率随扭矩的增加逐渐下降,抗压强度随扭矩的增加而逐渐增大,最佳施工温度为40℃;10℃、25℃时的最佳初压次数为20,相应的试件密实度分别为84.3%和85%;40℃时最佳初压次数为30,相应的试件密实度为85.7%。采用给出的水泥乳化沥青混合料拌和和易性评价方法可为路面拌和施工工艺提供参考,最佳初压次数对应的密实度可对摊铺机振捣梁和熨平板频率参数的选择与优化组合提供参考。In order to study the construction workability of cement-emulsified asphalt mixture and its effect on the compaction properties, the mixing torque value of cement-emulsified asphalt mixture was employed to represent construction workability on the basis of the surface free energy theory of asphalt. By employing the test equipment of mixing workability and superpave gyratory compactor （SGC）, mixing torque value and compaction performance of the mixture were respectively measured. The optimal mix ratio scheme of the mixture at normal temperature was determined by the range analysis of compressive strength, and evaluation method and influencing /actors for mixing workability of the mixture were proposed. According to the mixing states and mixing torque values, the optimum moisture content and recommended value of mixing time were determined for the mixture at 10 ℃ ,25 ℃ and 40 ℃. Analysis was did about the effect of paving workability on compaction performance for the mixtures at different initial compaction times under the three temperatures. The results show that moisture content has a significant effect on mixing workability of the mixture. The optimum moisture contents of the mixture are 5.25 %, 60% and 6. 5% at 10 ℃, 25 ℃ and 40℃, respectively. The recommended mixing time of the mixture at three temperatures is 12 s. As a whole, with the increase of temperature, the void fraction of specimen decreases and the compressive strength increases with the increase of torque value. The best construction temperature is 40 ℃. The optimal initial compaction times are 20 at 10 ℃ and 25 ℃, and the corresponding specimen compactness are 84.3% and 85%, respectively. The optimal initial compaction times are 30 at 40 ℃, and the corresponding specimen compactness is 85. 7%. The evaluation method for mfxing workability of the cement-emulsified asphalt mixture is able to offer reference for the mixing technology of pavement construction. The compactness value corresponding to the optimal init

关 键 词：道路工程 水泥乳化沥青混合料 扭矩值 拌和和易性 摊铺和易性 压实性能 

分 类 号：U415.6[交通运输工程—道路与铁道工程]