盛三湘 陈宇亮 王巍伟

摘要：为了提升就地热再生沥青混合料的路用性能，以数字图像处理技术进行集料识别为基础，采用均匀性评价确定再生混合料的集料分布不均匀系数D、新集料分布不均匀系数H、孔隙分布不均匀系数K和试件的孔隙率V，通过正交试验讨论了RAP加热温度、RAP拌和时间、新沥青混合料拌和温度及新旧料混合时间对就地热再生沥青混合料均匀性的影响，对结果进行了极差分析和方差分析。结果表明：1）RAP加热温度和新旧料混合时间对试件均匀性和孔隙率大小的影响都极为显著，宜控制在120～130 ℃;2）RAP拌和时间对试件均匀性影响较小，试件孔隙率随RAP拌和时间的增加逐渐降低，可控制在90 s左右;3）新沥青混合料温度对沥青混合料均匀性影响较小，而新旧料混合时间对沥青混合料均匀性影响较大，新旧料混合时间应不小于90 s。研究成果可为沥青路面就地热再生技术的优化提供参考。

关键词：特种建筑材料;沥青路面;就地热再生;均匀性;加热温度;拌合时间

中图分类号：U414文献标识码：ADOI： 10.7535/hbgykj.2021yx03011

Abstract：In order to improve the performance of hot in-place recycling asphalt mixtures， based on the aggregate recognition of digital image processing technology， the coefficient D of non-uniformity of aggregate distribution of recycled aggregate mixtures， the coefficient H of non-uniformity of new aggregate distribution， the coefficient K of non-uniformity of void distribution and the voidage V of specimen were determined by uniformity evaluation， and the influence of the RAP heating temperature， RAP mixing time， mixing temperature of new asphalt mixtures and mixing time of recycling mixtures on the uniformity of geothermal reclaimed asphalt mixtures were discussed by orthogonal experiment. The results are analyzed by range analysis and variance analysis. The results show that： 1） RAP heating temperature has significant effects on the uniformity and voidage of specimens as well as the mixing time of new and used mixtures， which should be controlled within 120～130 ℃; 2） the RAP mixing time has little effect on the uniformity of the specimens， and the voidage of the specimen decreases gradually with the increase of RAP mixing time which can be controlled at about 90 s ; 3） the temperature of new asphalt mixture has little influence on the uniformity of asphalt mixtures， while the mixing time of new and used materials has great influence on the uniformity of asphalt mixtures. The mixing time of new and used materials should not be less than 90 s. The research results provide a reference for the optimization of geothermal regeneration technology of asphalt pavement.

Keywords：special building materials; asphalt pavement; hot in-place recycling; uniformity; heating temperature; mixing time

作為高速路面的主要形式，沥青路面服役周期大约为10年，即每10年高速沥青路面就要经历一次大修[1]。常用的维修方法为铣刨重铺，铣刨产生的大量废弃沥青混合料基本上是堆放处理，不仅占用土地，而且污染环境[2]。沥青路面就地热再生技术作为一种路面材料再生技术应运而生[3-6]，然而在应用过程中再生沥青混合料的均匀性问题是较难解决的问题[7]。……