纳米SiO_(2)在乳化沥青中的不同形态及对乳液存储稳定性的影响  

Different Forms of Nano‑SiO_(2)in Emulsified Asphalt and Their Effects on Emulsion Storage Stability

作　　者：冀超 曹元浩 李志刚[3] JI Chao;CAO Yuanhao;LI Zhigang(Sixth Engineering Branch of CCCC Fourth Highway Engineering Co.,Ltd.,Tianjin 301700,China;Jiangsu Daozhi Highway Research Institute Co.,Ltd.,Nanjing,Jiangsu 210031,China;School of Transportation,Southeast University,Nanjing,Jiangsu 211189,China)

机构地区：[1]中交四公局第六工程有限公司,天津市301700 [2]江苏道智公路科学研究院有限公司,江苏南京210031 [3]东南大学交通学院,江苏南京211189

出　　处：《中外公路》2024年第1期76-81,共6页Journal of China & Foreign Highway

基　　金：国家自然科学基金资助项目(编号:51778621)。

摘　　要：乳化沥青存储性能不足一直是影响其应用的较大问题,中国已有将纳米SiO_(2)粒子作为添加剂来改善乳化沥青稳定性的研究,但其效果不明显。该文基于Pickering乳液原理将表面改性后的纳米SiO_(2)作为乳化剂直接乳化基质沥青,探究是否比纳米SiO_(2)作为改性添加剂对乳化沥青的稳定性改善效果更佳。首先分别制备了普通改性乳化沥青A、纳米SiO_(2)做改性添加剂的乳化沥青B和基于新型纳米SiO_(2)Pickering乳液乳化的乳化沥青C共3种乳化沥青,然后通过光学显微镜与SEM,探究纳米SiO_(2)粒子分别作为乳化剂和改性剂时乳化沥青表面结构的微观形貌差异,分析3种乳化沥青中乳液颗粒的不同形态;最后通过室内乳化沥青试验和乳液颗粒粒径分析,进一步论证纳米SiO_(2)分别作为乳化剂与改性剂对于乳化沥青存储稳定性的差异及差异机理。微观与宏观试验均表明纳米SiO_(2)作为乳化剂比作改性剂能使乳化沥青具备更好的稳定性。该文的研究说明纳米SiO_(2)用作乳化剂能更好地解决乳化沥青稳定性不足的问题,具有很好的应用前景。The insufficient storage performance of emulsified asphalt has always been a problem affecting its application,and there have been studies in China on nano-SiO_(2)particles as additives to improve the stability of emulsified asphalt,but the effect is not obvious.Based on the principle of Pickering emulsion,nano-SiO_(2)with surface modification was used as an emulsifier to directly emulsify matrix asphalt,and whether its stability improvement effect on emulsified asphalt is better than nano-SiO_(2)as a modified additive was explored.Firstly,three emulsified asphalt were prepared,namely ordinary modified emulsified asphalt A,emulsified asphalt B with nano-SiO_(2)as a modified additive,and emulsified asphalt C based on the new nano-SiO_(2)Pickering emulsion emulsification.Then,through optical microscopy and SEM,the microscopic morphological differences of the surface structure of the emulsified asphalt with nano-SiO_(2)particles as emulsifiers and modified additives were explored,and the different morphologies of emulsion particles in three emulsified asphalt were analyzed.Finally,the indoor emulsified asphalt test and particle size analysis of emulsion particles demonstrated the difference between nano-SiO_(2)as an emulsifier and a modified additive for the storage stability of emulsified asphalt and the mechanism of difference.Both microscopic and macroscopic experiments have shown that nano-SiO_(2)as an emulsifier can make emulsified asphalt have better stability compared with nano-SiO_(2)as a modified additive.The research indicates that nano-SiO_(2)as an emulsifier can better solve the problem of insufficient stability of emulsified asphalt and has good application prospects.

关 键 词：道路工程 乳化沥青 纳米SiO_(2)改性 纳米SiO_(2)乳化 Pickering乳液 改性效果 储存稳定性 

分 类 号：U414[交通运输工程—道路与铁道工程]