RAP掺量对再生沥青混合料最佳沥青用量影响分析  

Analysis of the Influence of RAP Dosage on the Optimal Asphalt Content of Recycled Asphalt Mixture

作　　者：孙欣 SUN Xin(Jiangxi Ganyue Expressway Engineering Co.,Ltd.,Nanchang Jiangxi 330013,China)

机构地区：[1]江西赣粤高速公路工程有限责任公司,江西南昌330013

出　　处：《交通节能与环保》2024年第1期156-159,共4页Transport Energy Conservation & Environmental Protection

摘　　要：为研究沥青混合料回收料(Reclaimed Asphalt Pavement,RAP)掺量对再生沥青混合料最佳沥青用量的影响,设计了4种掺量的AC-20再生沥青混合料,分别测试了5种沥青含量下再生沥青混合料马歇尔指标变化规律,分析了再生混合料沥青含量满足马歇尔指标要求的分布范围,比较了相同空隙率条件下再生沥青混合料沥青含量的变化趋势,提出了再生沥青混合料空隙率设计的建议范围。结果表明:RAP掺量的变化显著影响再生沥青混合料沥青含量分布,RAP掺量越高,满足设计马歇尔指标上下限要求的沥青含量越高。相同空隙率下,再生沥青混合料沥青含量随RAP掺量的增加而增加。AC-20再生沥青混合料在设计过程中,建议将空隙率范围控制在4.0%±0.5%,从而使设计的再生沥青混合料马歇尔指标均满足设计要求。To study the effect of reclaimed asphalt pavement dosage on the optimal asphalt content of recycled asphalt mixture,four types of AC-20 recycled asphalt mixture were designed.The Marshall indicators of recycled asphalt mixtures were tested at five different asphalt contents,and the distribution range of asphalt content meeting the Marshall criteria for recycled mixtures was analyzed.The trend of asphalt content in recycled asphalt mixtures under the same void ratio conditions was compared,and recommendations for the void ratio design of recycled asphalt mixtures were proposed.The results indicate that changes in RAP dosage significantly affect the distribution range of asphalt content in recycled asphalt mixtures.The higher the RAP content,the higher the asphalt content that meets the upper and lower limits of the design Marshall index requirements.Under the same void ratio,the asphalt content in recycled asphalt mixtures increases with an increase of RAP content.In the design process of AC-20 recycled asphalt mixtures,it is recommended to control the void ratio within the range of 4.0±0.5%,thereby ensuring that the Marshall index of the designed recycled asphalt mixture meets the design requirements.

关 键 词：沥青混合料回收料 再生沥青混合料 沥青用量 马歇尔指标 

分 类 号：U416.2[交通运输工程—道路与铁道工程]