为实现路面预防性养护材料的降温及净化尾气等环境功效，以技术成熟的微表处为载体，通过掺加功能性材料制备了环保型降温微表处，采用自制的室内、外降温测试装置和净化尾气测试装置，全面评价了不同类型环保型降温微表处降温和净化尾气功效，系统研究了环保型降温微表处路用性能，并揭示了其微观结构及功效作用机理。结果表明：复配型（WHT+WHTA）微表处降温和净化尾气功效最优，其次为WHTA微表处和WHT微表处；环保型降温微表处降温效果随路面温度的升高逐渐增强，室外降温幅度可达5.9℃，室内降温幅度可达6.5℃；环保型降温微表处对COx,NOx及SO2气体污染物的净化效果可达43%，对PM2.5和PM10颗粒污染物的净化效果可达59%；温度变化对单一类型环保型降温微表处WHT和WHTA的净化效率影响显著，对复配型（WHT+WHTA）微表处净化效率影响相对较小；不同类型环保型降温微表处路用性能良好；功能性材料稳定、均匀地分散于乳化沥青中，并引起了材料内部化学官能团组成的变化；环保型微表处降温及净化尾气功效主要源于由基础材料自身晶体结构特征引发的功能性材料自身极化效应。
Abstract
To achieve the environmental effect of cooling and exhaust purification for pavement preventive maintenance materials, the environment-friendly cooling micro-surfacing was prepared by adding functional materials, based on sophisticated micro-surfacing technology. The cooling and purifying testing devices were made independently for indoor and outdoor tests. The cooling and purifying effect of different types of environment-friendly cooling micro-surfacing was evaluated comprehensively. The road performances of the environment-friendly micro-surfacing were investigated systemically. The micro structure and the mechanism of cooling and purifying were revealed. The results show that the cooling and exhaust purifying effects of the compound (WHT+WHTA) micro-surfacing are the best, followed by WHTA micro-surfacing and WHT micro-surfacing. The cooling effect of environment-friendly cooling micro-surfacing increases gradually with the increase of pavement temperature. The outdoor cooling amplitude reaches 5.9 ℃ and the indoor cooling amplitude reaches 6.5 ℃. The purifying effect of COx, NOx and SO2 reaches 43%, and the purifying effect of particles with PM2.5 and PM10 reaches 59%. The change of temperature has a significant influence on the purifying effect of WHT and WHTA micro-surfacing, but the influence on the compound (WHT+WHTA) micro-surfacing is relatively small. Different types of environment-friendly micro-surfacing performs well. Functional materials disperse in emulsified asphalt stably and uniformly, which leads to the change of chemical functional groups. The cooling and purifying effect of the environment-friendly micro-surfacing is mainly derived from the self-polarization effect of functional materials caused by the crystal structure characteristics of the base materials.
关键词
道路工程 /
微表处 /
降温 /
净化尾气 /
机理
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Key words
road engineering /
micro-surfacing /
cooling /
exhaust purifying /
mechanism
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中图分类号：
U414.1
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参考文献
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基金
交通运输部建设科技项目（2013 318 49A270）；中央高校基本科研业务费专项资金项目（310821162013）； 陕西省自然科学基础研究计划项目（2014JM2-5045）；天津市建设科技发展计划项目（2014-15）
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