水泥乳化沥青胶浆与RAP粘附性的量化评价

发布时间：2018-02-13 16:45

本文关键词： 道路工程回收沥青路面材料(RAP) 水泥乳化沥青胶浆界面粘附量化评价　出处：《长安大学学报(自然科学版)》2016年05期 　论文类型：期刊论文

【摘要】：冷再生乳化沥青混合料中存在水泥乳化沥青胶浆对回收沥青路面材料(RAP)粘附不均匀以及浸水易剥落等问题,直接影响了混合料的水稳定性等路用性能。国内外对水泥乳化沥青胶浆与RAP粘附程度多采用定性评价,缺乏便于操作且能够精确量化的测试方法。利用HCl溶液侵蚀水泥乳化沥青胶浆薄层模拟试验,运用数字图像技术对回收沥青路面材料(RAP)进行二维形状特征提取,提出了RAP表面积计算模型;同时设计了不同形状指数的RAP与水泥乳化沥青胶浆粘附性试验,并对粘附界面的胶浆用HCl溶液进行侵蚀试验,以20min内Ca2+和Mg2+的释放量表征RAP表面胶浆层的抗盐酸侵蚀性和粘附均匀性。研究结果表明:HCl对水泥乳化沥青胶浆有侵蚀特性,可腐蚀胶浆中水泥的水化产物相;集料形状指数对水泥乳化沥青胶浆平均膜厚度影响不大;RAP形状指数越大,离子释放量与粘附量的比也越大,胶浆粘附层抗盐酸侵蚀能力下降,粘附的均匀性和粘附等级变差;随着水泥与乳化沥青质量比C/EA的增加,离子的释放量先减小后增大,胶浆粘附性先增大后减小;当C/EA为30%时,离子释放量最小,粘附性最佳。
[Abstract]:In cold regenerated emulsified asphalt mixture, there are some problems such as uneven adhesion of cement emulsified asphalt slurry to recycled asphalt pavement material and easy spalling in water. It has a direct effect on the water stability of the mixture. The adhesive degree of cement emulsified asphalt paste to RAP is evaluated qualitatively at home and abroad. In this paper, we use HCl solution erosion cement emulsified asphalt slurry thin layer simulation test, using digital image technology to extract 2D shape feature of recovered asphalt pavement material. The surface area calculation model of RAP was put forward, and the adhesion test of RAP with different shape index to cement emulsified asphalt slurry was designed, and the corrosion test of HCl solution at adhesion interface was carried out. The amount of Ca2 and Mg2 released within 20 minutes was used to characterize the hydrochloric acid corrosion resistance and adhesion uniformity of RAP surface slurry. The results showed that w HCl had erosion characteristics on cement emulsified asphalt mortar and could corrode the hydration product phase of cement in cement slurry. The effect of aggregate shape index on the average film thickness of cement emulsified asphalt slurry is not significant. The larger the shape index of rap is, the greater the ratio of ion release to adhesion amount is, and the corrosion resistance of adhesive layer to hydrochloric acid decreases, and the uniformity and adhesion grade of adhesive layer become worse. With the increase of the mass ratio of cement to emulsified asphalt, the amount of ion release decreases first and then increases, and the adhesion of cement paste increases first and then decreases. When the mass ratio of C / EA is 30, the ion release is the smallest and the adhesion is the best.
【作者单位】：长安大学材料科学与工程学院;浙江省交通运输科学研究院;
【基金】：国家自然科学基金项目(50908021) 福建省科技计划重点项目(2014H0017) 中央高校基本科研业务费专项资金项目(310831153504,310831163113)
【分类号】：U414

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