PPA复合改性对沥青-集料黏附及其水稳定性影响研究
Effect of PPA Composite Modification on Asphalt-aggregate Adhesion and Water Stability
周育名 1张凯 2郭云龙 3岳浩 4王迪 5彭竹仪 2刘朝晖 2魏建国2
作者信息
- 1. 长沙理工大学道路结构与材料交通行业重点实验室,湖南长沙 410114;长沙理工大学交通运输工程学院,湖南长沙 410114
- 2. 长沙理工大学交通运输工程学院,湖南长沙 410114
- 3. 江苏东交智控科技集团股份有限公司,江苏南京 210046
- 4. 山东高速交通建设集团有限公司,山东济南 250014
- 5. 渥太华大学土木工程学院,渥太华 KIN 6N5
- 折叠
摘要
为探究多聚磷酸(PPA)对沥青-集料之间黏附及其水稳定性的影响,提出了以基质沥青、PPA改性沥青、SBS/PPA和SBR/PPA复合改性沥青与石灰岩、玄武岩和花岗岩集料组合的沥青混合料设计方案.采用分子动力学模拟方法,构建沥青-集料界面模型,并通过原子力显微镜(AFM)、接触角试验、动态剪切流变试验(DSR)以及浸水马歇尔试验和冻融劈裂试验探究了 PPA掺加后对沥青-集料黏附及其水稳定性的影响.结果表明:随着PPA改性剂的添加,沥青表面自由能显著增大,沥青与集料间黏附功提高,交互能力增强,沥青混合料的水稳定性更优;通过3种集料的试验结果对比,发现碱性集料对改性沥青-集料的黏附与水稳定性改善效果更好;PPA加入后,使SBS、SBR聚合物改性沥青与集料间的黏附功略有下降,但综合水稳定性得到明显改善;因此,推荐采用SBS/PPA复合改性沥青及石灰岩集料进行混合料组合设计,此组合可以得到最佳的黏附性及水稳定性.
Abstract
To explore the influence of polyphosphoric acid(PPA)on the adhesion and water stability of asphalt-aggregate interface systems,in this study,a design scheme was proposed for asphalt mixtures with matrix asphalt,PPA-modified asphalt,SBS/PPA,SBR/PPA composite-modified asphalt and limestone,basalt,and granite aggregates.A molecular dynamics simulation method was used to construct the asphalt-aggregate interface model,and the effects of PPA addition on asphalt-aggregate adhesion and water stability were investigated via atomic force microscopy(AFM),contact angle test,dynamic shear rheological test(DSR),immersion Marshall test,and freeze-thaw splitting test.The results show that with the addition of the PPA modifier,the surface free energy of the asphalt increases significantly,adhesion between the asphalt and aggregate increases,the interaction ability increases,and the water stability of the asphalt mixture improves.By comparing the test results of the three types of aggregates,it is determined that the alkaline aggregate has a better effect on the adhesion and water stability of the asphalt-aggregate.The composite modification of SBS,SBR polymer,and PPA slightly decreases the adhesion between asphalt and aggregate.However,the improvement in comprehensive water stability is more evident.Hence,SBS/PPA composite-modified asphalt and limestone aggregate are recommended for the mixture combination design.This can lead to the best adhesion and water stability.
关键词
路面工程/多聚磷酸改性沥青/试验分析/黏附性能/水稳定性/沥青-集料界面Key words
pavement engineering/polyphosphoric acid modified asphalt/experimental analysis/adhesion performance/water stability/asphalt-aggregate interface引用本文复制引用
基金项目
国家自然科学基金青年科学基金项目(52108396)
长沙理工大学道路结构与材料交通行业重点实验室开放基金项目(kfj210301)
国家自然科学基金项目(52278437)
出版年
2024
NETL
NSTL
万方数据