改性氢氧化镁与钠基膨润土复合抑烟沥青相容性研究  

Study on the compatibility of modified magnesium hydroxide and sodium-based bentonite composite smoke-suppressing asphalt

作　　者：孙吉书 路遥 穆欣悦 陈永亮 SUN Jishu;LU Yao;MU Xinyue;CHEN Yongliang(School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China;Tianjin Traffic Engineering Green Materials Technology Engineering Center,Tianjin 300399,China;Xingtai Highway Engineering Management Center,Xingtai 054001)

机构地区：[1]河北工业大学土木与交通学院,天津300401 [2]天津市交通工程绿色材料技术工程中心,天津300399 [3]邢台市公路工程管理中心,河北邢台054001

出　　处：《广西大学学报（自然科学版）》2024年第2期291-301,共11页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金项目(52008154);邢台市重点研发计划项目(2022ZC134)。

摘　　要：为了解决抑烟沥青中氢氧化镁相容性较差的问题,用铝酸酯偶联剂对氢氧化镁进行湿法表面改性,并复配钠基膨润土增强其抑烟性能。通过沥青烟气测定装置和三大指标实验确定抑烟沥青的最佳掺配比例;通过扫描电子显微镜实验和傅里叶红外光谱实验对复合抑烟沥青的微观机制进行分析;最后通过粒径分析、荧光显微镜实验、分散性比较和离析实验对氢氧化镁的改性效果进行评价。结果表明:改性氢氧化镁与钠基膨润土有协同抑烟效果,复合抑烟沥青的相容性更好,相较氢氧化镁/钠基膨润土抑烟沥青,抑烟率提高了2.9%,延度增大了2.5 cm,储存48 h后的软化点差减小了0.4℃。改性氢氧化镁与钠基膨润土复合抑烟沥青的相容性和各项路用性能相较各自单掺均得到较大提升。To solve the poor compatibility of magnesium hydroxide in smoke-suppressing asphalt,magnesium hydroxide was surface modified by wet method using aluminate coupling agent,and sodium-based bentonite was added to enhance its smoke suppression performance.The optimal blending ratio of smoke-suppressing asphalt was determined through asphalt smoke testing device and three major index experiments.The microscopic mechanism of the composite smoke-suppressing asphalt was analyzed through scanning electron microscope experiments and Fourier transform infrared spectroscopy experiments.Finally,the modification effect of magnesium hydroxide was evaluated through particle size analysis,fluorescence microscope experiments,dispersion,and separation experiments.The results show that:the modified magnesium hydroxide and sodium-based bentonite have synergistic smoke suppression effects.The compatibility of the composite smoke-suppressing asphalt is better.Compared with magnesium hydroxide/sodium-based bentonite smoke-suppressing asphalt,the smoke suppression rate increased by 2.9%,the ductility increased by 2.5,and the softening point difference after 48 hours of storage decreased by 0.4℃.The compatibility and road performance of the modified magnesium hydroxide and sodium-based bentonite composite smoke-suppressing asphalt have been greatly improved compared with their respective single doping.

关 键 词：道路工程 复合抑烟沥青 相容性 氢氧化镁 铝酸酯偶联剂 钠基膨润土 

分 类 号：U414[交通运输工程—道路与铁道工程]