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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。
In order to realize the environmental effect of cooling and purifying tailings of pavement preventive maintenance materials and the like, the mature micro-surfacing site is used as a carrier, an environment-friendly cooling micro-surfacing site is prepared by incorporating functional materials, a home-made indoor and outdoor cooling test device And purifying tail gas test device, the effects of different types of environment-friendly cooling micro-surfacing on cooling and purifying tail gas were comprehensively evaluated. The performance of environment-friendly cooling micro-surfacing system was systematically studied and the microstructure and mechanism of action were revealed. The results showed that WHT + WHTA was the best for cooling and purifying tail gas, followed by WHTA and WHT. The cooling effect of environment-friendly cooling micro-surfacing gradually increased with the increase of temperature , The outdoor cooling rate of up to 5.9 ℃, indoor cooling rate of up to 6.5 ℃; environmental protection cooling table for COx, NOx and SO2 gas pollutants purification up to 43% of the PM2.5 and PM10 particulate pollutants The purification effect can reach 59%; the temperature change has a significant effect on the purification efficiency of WHT and WHTA at a single type of environment-friendly cooling micro-surficial table, and has a relatively small effect on the purification efficiency of the micro-table at WHT + WHTA. Different types of environment- The performance of cooling micro-surfacing is good. The functional materials are stably and evenly dispersed in the emulsified asphalt and cause the change of chemical functional groups in the material. The environmental protection micro-surfacing cooling and purifying tail gas mainly comes from the basic material itself The polarization of functional materials induced by the crystal structural features.