| 路用多孔页岩陶粒表面修饰优化 |
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| 引用本文： | 王朝辉,刘鲁清,韩晓霞,李天宇,韩继国.路用多孔页岩陶粒表面修饰优化[J].中国公路学报,2019,32(4):196-206. |
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| 作者姓名： | 王朝辉 刘鲁清 韩晓霞 李天宇 韩继国 |
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| 作者单位： | 1. 长安大学 公路学院, 陕西 西安 710064;
2. 天津市市政工程设计研究院, 天津 300051;
3. 交通运输部科学研究院, 北京 100029 |
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| 基金项目： | 交通运输部建设科技项目（201331849A270）；陕西省自然科学基础研究计划项目（2014JM2-5045）；天津市城乡建设委员会科学技术发展计划项目（2014-15）；中央高校基本科研业务费专项资金项目（300102218210，300102219314） |
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| 摘 要： | 为提高路用多孔页岩陶粒的路用性能并提升其阻热性能，优选3种有机处理剂，借助吸水率、筒压强度、控制筛孔通过率及磨耗值试验，确定了不同处理剂最佳修饰工艺；基于吸油率、表面孔隙封堵率与SEM试验，系统研究了修饰前后页岩陶粒表面孔隙封堵情况，对比评价了不同处理剂对页岩陶粒路用性能的影响规律，确定了页岩陶粒最佳处理剂；并在此基础上，全面评价了表面修饰对页岩陶粒混合料路用性能的影响。结果表明：苯基硅树脂的适宜浓度为25%，固化温度为160℃，硅丙乳液的适宜浓度为35%，成膜温度为30℃，助剂含量为3%，建筑防水剂修饰页岩陶粒的适宜浓度为35%，固化温度为85℃；其中苯基硅树脂对页岩陶粒表面封装效果最好，24 h吸油率最低，表面孔隙封堵率高达78%，且SEM图像也表明经表面修饰的页岩陶粒表面开口孔隙数量明显减少；3种处理剂均能不同程度地提高路用多孔页岩陶粒的路用性能，24 h吸水率的降幅在80.48%~94.5%之间，压碎值降幅在4.62%~17.52%之间，磨耗值降幅在5.33%~30.92%之间，黏附性等级提高0.5~2级；苯基硅树脂对页岩陶粒吸水率与黏附性等级改善效果最佳，硅丙乳液对压碎值与磨耗值改善效果最为明显，综合考虑所有评价指标，确定了页岩陶粒最佳处理剂为苯基硅树脂；且经苯基硅树脂表面修饰后的页岩陶粒混合料各项路用性能均有不同程度提高。
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| 关 键 词： | 道路工程 页岩陶粒 表面修饰 多孔岩陶粒 优化 性能 |
| 收稿时间： | 2018-08-08 |
Optimization of Surface Modification of Porous Expanded Shale |
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| WANG Chao-hui,LIU Lu-qing,HAN Xiao-xia,LI Tian-yu,HAN Ji-guo.Optimization of Surface Modification of Porous Expanded Shale[J].China Journal of Highway and Transport,2019,32(4):196-206. |
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| Authors: | WANG Chao-hui LIU Lu-qing HAN Xiao-xia LI Tian-yu HAN Ji-guo |
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| Affiliation: | 1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China;
2. Tianjin Municipal Engineering Design and Research Institute, Tianjin 300051, China;
3. China Academy of Transportation Sciences, Beijing 100029, China |
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| Abstract: | In order to improve the road performance and promote the heat resistance of porous expanded shale, and optimization of three organic treatment agents, the best modification process of different treatment agents was determined through water absorption, cylindrical compress strength, control mesh pass rate, and abrasion value. Based on the oil absorption, surface pore blocking rate, and scanning electron microscopy (SEM) test, the pore blocking conditions on the surface of expanded shale before and after modification were systematically studied; the effects of different treatment agents on road performance of expanded shale were compared and evaluated; and the best treatment agent for expanded shale was determined. On this basis, the road performance of expanded shale mixture before and after modification was evaluated in detail. The results showed that, the suitable concentration of phenyl silicone resin for expanded shale is 25%, with curing temperature of 160℃, the suitable concentration of silicone-acrylate emulsion is 35%, with curing temperature of 30℃, the content of auxiliaries is 3%, and the suitable concentration of building waterproofing agent is 35% with curing temperature of 85℃. Phenyl silicone resin has the best encapsulation effect on the surface of expanded shale, along with the lowest oil absorption rate in 24 h and surface pore blocking rate as high as 78%. The SEM images show that the number of open pores on the surface of treated expanded shale was significantly reduced. The three treatment agents can improve the road performance of expanded shale in different degrees. The decreased water absorption rate in 24 h ranged between 80.48% and 94.5%. The decrease in crushing value ranged between 4.62% and 17.52%. The decrease in abrasion value ranged between 5.33% and 30.92%, and adhesional degree increased by 0.5-2. Phenyl silicone resin has the best effect on improving the water absorption rate and adhesional degree of expanded shale particles. Silicone-acrylate emulsion has the most obvious effect on improving the crushing value and abrasion value. The best treatment agent was determined to be phenyl silicone resin. The road performance of expanded shale mixtures modified by phenyl silicone resin has been improved in different extents. |
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| Keywords: | road engineering expanded shale surface modification porous expended shale optimization performance |
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