摘要
通过室内模拟试验揭示恒定环境条件下乳化沥青冷再生强度的发展状况,并研究了水泥和乳化沥青在不同时期对其强度的影响及贡献,借助环境扫描电镜等微观检测手段分析了水泥乳化沥青胶浆中的水化反应、乳化沥青破乳过程.结果表明:乳化沥青冷再生强度呈先快后慢且长期增长的趋势;水泥掺量越大,乳化沥青冷再生早期和后期强度越高;水泥可促进早期强度快速提升,破乳后的沥青提供主要的强度来源;乳化沥青用量存在最佳值,在该值早期和后期强度最大;乳化沥青虽然延缓了水泥的早期水化,但水泥可促进乳化沥青团聚破乳,其水化产物与破乳后的沥青形成加筋结构,从而使强度进一步提高.
The strength development of cold regeneration with asphalt emulsion（CRAE） under the constant envi- ronment condition was revealed by indoor simulation test, and then the strength contribution in different periods under the conditions of different content of cement and asphalt emulsion was studied. The cement hydration process in cement emulsified asphalt mortar, and asphalt emulsion demulsification process were analyzed by micro analysis method such as ESEM et al. The results indicate that the development of strength of CRAE shows the long-term mode that not only the rapid growth in the early stage and the slow growth in the late stage, but also the early and late strength can be promoted significantly by cement. It has also shown that the larger the content, the higher the amplitude; cement contributes to the rapid improvement of early strength, Demulsification asphalt pro- vides the main source of strength. At the best asphalt emulsion content maximum early or late strength can be a- chieved. The early cement hydration reaction can be inhibited by asphalt emulsion and the effect of cement on as- phalt emulsion demulsification is mainly reflected by the attraction of cement particles and the particles agglomera- tion due to the hydration product. The reinforced structure formed by cement hydration products and asphalt can promote the strength further.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2017年第2期310-315,共6页
Journal of Building Materials
基金
国家自然科学基金资助项目(51278231)
江苏省自然科学基金资助项目(BK20151013)
关键词
乳化沥青
水泥
强度
作用机理
emulsified asphalt
cement
strength
action mechanism
