PET塑料衍生添加剂对再生骨料沥青黏结性的影响  

Influence of PET Plastic Derived Additives on Bonding Between Recycled Concrete Aggregate and Asphalt

作　　者：陈国夫 李林 李柱凯 马静月 徐雄 CHEN Guo-fu;LI Lin;LI Zhu-kai;MA Jing-yue;XU Xiong(Architectural Engineering Institute,Guang’an Vocational&Technical College,Guang’an,Sichuan 638500,China;Guang’an Development and Construction Group Co.,Ltd.,Guang’an,Sichuan 638500,China;School of Civil Engineering and Architecture,Wuhan Institute of Technology,Wuhan,Hubei 430073,China;Hubei Provincial Engineering Research Center for Green Civil Engineering Materials and Structures,Wuhan,Hubei 430073,China)

机构地区：[1]广安职业技术学院建筑工程学院,四川广安638500 [2]广安发展建设集团有限公司,四川广安638500 [3]武汉工程大学土木工程与建筑学院,湖北武汉430073 [4]绿色土木工程材料与结构湖北省工程研究中心,湖北武汉430073

出　　处：《公路交通科技》2024年第11期41-49,共9页Journal of Highway and Transportation Research and Development

基　　金：交通运输部科技计划项目(2020J6);湖北省自然科学基金项目(2023AFB245);湖北省住房和城乡建设厅项目(2023177);河南省科技厅项目(202202220201502);广安市2023年“揭榜挂帅制”科技项目(2023JBGS01);广安职业技术学院2024年度校级科研项目(GAZYKY-2024A08)。

摘　　要：再生骨料表面附着砂浆,存在压碎值高和吸水性强等劣势,导致制备的再生骨料沥青混合料路用性能表现较差。针对再生骨料沥青体系中黏结力薄弱等缺陷,采用废弃PET塑料的衍生添加剂,作为再生骨料沥青混凝土的性能增强剂。通过研究不同掺量PET添加剂对沥青与再生骨料黏附性能的影响,进行了接触角试验、水煮试验和拉拔试验,评估了PET添加剂在浸水马歇尔试验和冻融劈裂试验中对再生骨料沥青混凝土水稳定性的影响。结果表明:PET添加剂的掺入能显著提升沥青与再生骨料的黏附力,有效增强沥青混凝土的抗剥落性能,不仅有助于降低水分对再生骨料-沥青界面黏结力的负面影响,还能保护再生骨料表面的砂浆层;当PET添加剂掺量为1%时,再生骨料沥青混凝土的浸水残留稳定度和冻融劈裂强度比分别提升了15.9%和16.2%;随着PET添加剂掺量的增加,未观察到再生骨料沥青混凝土水敏感性持续降低的趋势,这表明适度添加PET添加剂对改善混凝土水稳定性具有显著而可控的效果。The recycled aggregate surface is adhered with mortar,presenting disadvantages such as high crushing value and strong water absorption.That results in poor road performance of the recycled aggregate asphalt mixture.Aiming at the deficiencies(i.e.,weak bonding force)in the recycled aggregate asphalt system,the waste PET plastic derived additive was adopted as the performance enhancer for recycled aggregate asphalt concrete.Through conducting contact angle test,boiling test and pull-out test,the influence of different PET additive dosages on bonding between asphalt and recycled aggregate was studied.The influence of PET additive on water stability of recycled aggregate asphalt concrete in the immersion Marshall test and freeze-thaw split test was evaluated.The result indicates that the incorporation of PET additive can significantly enhance the bonding force between asphalt and recycled aggregate.It effectively improves the anti-stripping performance of asphalt concrete.It not only helps to mitigate the negative influence of water on bonding force at the interface between recycled aggregate and asphalt,but also protects the mortar layer on recycled aggregate surface.When the PET additive dosage is 1%,the immersion residual stability and freeze-thaw split strength ratio of recycled aggregate asphalt concrete increase by 15.9%and 16.2%respectively.No continuous decrease in the water sensitivity of recycled aggregate asphalt concrete is observed with the increase of PET additive dosage.It shows that the moderate addition of PET additive has the significant and controllable effects on improving the concrete water stability.

关 键 词：道路工程 PET塑料 试验分析 再生骨料 沥青混凝土 水稳定性 

分 类 号：U414[交通运输工程—道路与铁道工程]