水泥与乳化沥青对冷再生强度的影响及作用机理

发布时间：2019-05-18 07:04

【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.
[Abstract]:The development of cold recycling strength of emulsified asphalt under constant environmental conditions was revealed by laboratory simulation test, and the influence and contribution of cement and emulsified asphalt on their strength in different periods were studied. The hydration reaction in cement emulsified asphalt slurry and the demulsification process of emulsified asphalt were analyzed by means of environmental scanning electron microscope and other microscopic detection methods. The results show that the cold regeneration strength of emulsified asphalt tends to be fast at first, then slow and increases for a long time, and the higher the cement content is, the higher the strength of emulsified asphalt is in the early and later stages of cold regeneration. Cement can promote the rapid improvement of early strength, and the asphalt after demulsification provides the main source of strength, and the content of emulsified asphalt has the best value, and the strength is the highest in the early and later stages of the value. Although emulsified asphalt delays the early hydration of cement, cement can promote the agglomeration and demulsification of emulsified asphalt, and the hydration products form reinforced structure with the asphalt after demulsification, thus further improving the strength.
【作者单位】：江苏苏博特新材料股份有限公司;高性能土木工程材料国家重点实验室;江苏省建筑科学研究院有限公司;
【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)
【分类号】：U414

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