界面作用下温拌再生混合料设计方法及其水稳性研究

发布时间：2018-12-10 20:27

【摘要】：介绍了温拌再生混合料AC13的设计步骤和设计方法,以Evotherm温拌剂和自制的界面分散剂为添加剂,采用水煮法和冻融劈裂试验方法系统研究了界面分散剂用量对温拌再生混合料水稳性和黏附性的影响,分析了界面作用下RAP中旧沥青膜与旧集料的形态变化,并确定了其合理用量。结果表明,随着界面分散剂用量增大,温拌再生混合料冻融前后的劈裂强度和TSR值发生了较显著变化;当界面分散剂用量为RAP的0.2%时,温拌再生混合料的TSR值和冻融前后的劈裂强度均较高,表明此时温拌再生沥青混合料具有优异的水稳性,过量的界面分散剂对温拌再生混合料的水稳性有一定负面影响;旧集料通过界面作用,实现了与旧沥青膜的剥离并与新沥青胶结料的二次裹覆。
[Abstract]:This paper introduces the design steps and design methods of warm mix recycled mixture AC13. The Evotherm warm mix agent and the self-made interfacial dispersant are used as additives. The effects of the amount of interfacial dispersant on the water stability and adhesion of warm mix recycled mixture were studied systematically by means of boiling method and freeze-thaw splitting test method. The morphological changes of old asphalt film and old aggregate in RAP under interfacial action were analyzed. The reasonable dosage was determined. The results show that the splitting strength and TSR value of warm mixed recycled mixture change significantly before and after freeze-thaw with the increase of the amount of interfacial dispersant. When the content of interfacial dispersant is 0.2 of RAP, the TSR value and splitting strength before and after freezing and thawing of warm mixed recycled asphalt mixture are both higher, which indicates that the warm mixed recycled asphalt mixture has excellent water stability at this time. Excessive interfacial dispersant has a certain negative effect on the water stability of warm mix recycled mixture. The old aggregate can be peeled off from the old asphalt film and coated with the new asphalt binder through interfacial action.
【作者单位】：重庆交通大学;
【基金】：重庆市博士后特别资助项目;渝xm201102010
【分类号】：U414

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