| 引用本文: | 吕泉,黄卫东,孙立军,周璐,刘力源.沥青粘附性自愈合性能评价与机理分析[J].哈尔滨工业大学学报,2021,53(3):33.DOI:10.11918/202005033 |
| Lü Quan,HUANG Weidong,SUN Lijun,ZHOU Lu,LIU Liyuan.Evaluation and mechanism analysis of adhesive self-healing property of asphalt[J].Journal of Harbin Institute of Technology,2021,53(3):33.DOI:10.11918/202005033 |
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| 沥青粘附性自愈合性能评价与机理分析 |
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吕泉1,2,3,黄卫东2,3,孙立军1,2,3,周璐2,3,刘力源2,4
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(1.上海市轨道交通结构耐久与系统安全重点实验室(同济大学),上海 201804; 2.道路与交通工程教育部重点实验室(同济大学),上海 201804;3.同济大学 交通运输工程学院, 上海 201804; 4.黄土地区公路建设与养护技术国家交通行业重点实验室(山西交通科学研究院集团有限公司),太原 030006)
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| 摘要: |
| 为了评价与对比不同沥青的粘附性自愈合性能,并从微观层面解释沥青自愈合的机理,采用BBS（binder bond strength）实验测量了7种基质沥青与4类不同掺量的改性沥青（SBS类、溶解性胶粉类、岩沥青类以及高密度聚乙烯类）的粘附性自愈合性能. 并选取其中部分沥青进行红外光谱测试,通过分子链结构指数（MMHC）对沥青的自愈合机理进行分析. 最后,将沥青粘度这一常规指标与自愈合性能进行相关性分析. 结果表明:不同基质沥青之间,多次破坏-愈合循环后的粘附性自愈合性能有明显差异. 低掺量的高密度聚乙烯与岩沥青能提高沥青的粘附性自愈合能力,线型、星型SBS及胶粉均不利于沥青的粘附性自愈合性能. 基质沥青的MMHC指数与其粘附性愈合率呈明显负线性相关关系,但MMHC指数不可用于预测改性沥青的粘附性自愈合性能. 基质沥青与改性沥青的135 ℃布氏粘度指标均与其愈合率呈良好的线性相关性,相较于MMHC指数,135 ℃布氏旋转粘度更适合作为预测沥青粘附性自愈合能力的常规评价指标. |
| 关键词: 粘附性自愈合性能 分子链结构指数 BBS实验 红外光谱实验 |
| DOI：10.11918/202005033 |
| 分类号:U414 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(8,1,51908426) |
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| Evaluation and mechanism analysis of adhesive self-healing property of asphalt |
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Lü Quan1,2,3,HUANG Weidong2,3,SUN Lijun1,2,3,ZHOU Lu2,3,LIU Liyuan2,4
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(1. Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety (Tongji University), Shanghai 201804, China; 2. Key Laboratory of Road and Traffic Engineering of Ministry of Education (Tongji University), Shanghai 201804, China; 3. College of Transportation Engineering, Tongji University, Shanghai 201804, China; 4. Key Laboratory of Highway Construction and Maintenance Technology of Ministry of Transport in Loess Region (Shanxi Transportation Research Institute Group Co., Ltd.), Taiyuan 030006, China)
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| Abstract: |
| To compare and evaluate the adhesive self-healing properties of different asphalt and explain the mechanism of asphalt self-healing from micro-level, the binder bond strength (BBS) test was conducted on seven base asphalt binders and four types of modified asphalt with different dosages (SBS, terminal blend rubber, gilsonite, and high-density polyethylene). Fourier transform infrared (FTIR) test was carried out on selected asphalt, and the mechanism of self-healing was analyzed by asphalt molecular chain structure index (methylene plus methyl hydrogen to carbon, MMHC). The correlation between viscosity of asphalt and self-healing performance was obtained. Results show that the adhesive self-healing properties of different base asphalt binders after multiple failure-healing cycles were significantly different. High-density polyethylene and gilsonite at low dosages could improve the self-healing property of asphat, whereas linear, radial SBS, and rubber powder had negative effect on the adhesive self-healing property of asphalt. There was a significant negative linear correlation between MMHC index and healing ratio of base asphalt. However, the MMHC index could not be used to predict the adhesive self-healing property of modified asphalt. The Brookfield rotary viscosity of base asphalt and modified asphalt at 135 ℃ both showed good linear correlation with their healing ratio. Compared with MMHC index, Brookfield rotary viscosity at 135 ℃ is a more suitable evaluation indicator for predicting the adhesive self-healing property of asphalt. |
| Key words: adhesive self-healing property MMHC index BBS test FTIR test |
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