不同RAP掺量下热再生沥青混合料性能衰变规律
Performance Decay Law of Hot Recycled Asphalt Mixture with Different RAP Content
朱云升 1章汉卿 1王开凤 1李华聪 1陈美祝2
作者信息
- 1. 武汉理工大学交通与物流工程学院 武汉 430063;湖北省公路工程研究中心 武汉 430063
- 2. 武汉理工大学材料科学与工程学院 武汉 430070
- 折叠
摘要
本文采用自主研发的全寿命分析仪对沥青混合料分别进行0、4、8、12个月的模拟老化,采用冻融劈裂试验、动态蠕变试验和半圆弯曲试验,研究不同RAP掺量下热再生沥青混合料长期老化后各项性能的衰变规律.结果表明:在12个月模拟老化后,RAP掺量为30％时沥青混合料的流变次数达到最大,RAP掺量的提高使得TSR衰减幅度变大且断裂能下降.50％RAP掺量时再生料TSR衰减幅度比新拌料大7.9％,流变次数和断裂能较新拌料分别减少38.6％和61.7％.长期老化作用下RAP掺量对沥青混合料疲劳寿命衰减的影响不明显,但会降低其应力敏感性.
Abstract
The asphalt mixture was simulated aging for 0,4,8 and 12 months by a self-developed life analyzer.Freeze-thaw splitting test,dynamic creep test and semi-circular bending test were used to study the decay law of various properties of hot recycled asphalt mixture with different RAP content after long-term aging.The results show that after 12 months of simulated aging,the rheological times of asphalt mixture reach the maximum when the RAP content is 30％.With the increase of RAP con-tent,TSR attenuation amplitude increases and fracture energy decreases.With 50％RAP content,the TSR attenuation of recycled aggregate is 7.9％larger than that of new aggregate,and the rheological times and fracture energy are reduced by 38.6％and 61.7％respectively.Under long-term aging,the effect of RAP content on fatigue life attenuation of asphalt mixture is not obvious,but it will reduce its stress sensitivity.
关键词
热再生沥青混合料/RAP掺量/全寿命分析仪/路用性能/性能衰变Key words
hot-mix recycled asphalt mixture/RAP content/life cycle analysis system/road perform-ance/performance decay引用本文复制引用
出版年
2024
NETL
NSTL
万方数据