市政技术2025，Vol.43Issue(7)：238-249,12.DOI:10.19922/j.1009-7767.2025.07.238
RAP变异性控制对高掺量再生沥青混合料性能影响研究
Influence of RAP Variability Control on the Performance of High Dosage Recycled Asphalt Mixtures
摘要
Abstract
In order to reduce the compositional variability of recycled asphalt pavement(RAP)materials and improve its utilization efficiency in high content recycled asphalt mixtures,a triple variability control technology path of ho-mogenization pretreatment-fine grading-gradation optimization was constructed.The coefficient of variation of the oil to stone ratio for RAP with the coarse particle size of 7.00～15.00 mm was reduced from 6.37％to 2.29％(de-creased by about 64％)by a four level fine grading system;At the same time,the coefficient of variation of the key sieve size with 4.75 mm was reduced from 6.52％to 2.25％(decreased by about 65％),and the coefficient of vari-ation of the 0.075 mm sieve size was reduced from 8.91％to 5.03％(decreased by about 44％).Under the condition of 60％RAP content,the mean dynamic stability of recycled asphalt mixture was improved by 5.0％,the maximum flexural tensile strain was increased by 5.6％,the freeze-thaw splitting strength ratio was increased by 6.4％,and the fracture energy was increased by 9.6％through fine grading and gradation optimization(the pass rate of particles be-low 4.75 mm was controlled between the middle and upper limits of AC-13 gradation).The results of macro and mi-cro experiments show that the combination of fine grading and gradation optimization can significantly improve the high-temperature stability,low-temperature crack resistance,and water stability of recycled asphalt mixtures,and improve the adhesion quality of asphalt aggregate at the micro level.This research result can provide quantitative ba-sis and technical reference for the variability control and mix proportion optimization of high content RAP recycled asphalt mixtures.关键词
道路工程/再生沥青混合料/RAP变异性/分档控制/级配优化Key words
road engineering/recycled asphalt mixture/reclaimed asphalt pavement(RAP)variability/graded control/gradation optimization分类
交通工程引用本文复制引用
陆慧峰,秦可畏,刘海宁,汪向红,申赞,徐光霁..RAP变异性控制对高掺量再生沥青混合料性能影响研究[J].市政技术,2025,43(7):238-249,12.基金项目
国家自然科学基金项目(51808116) （51808116）
江苏省自然科学基金(省市联合)项目(BK20232036) （省市联合）
