{"title":"Influence of rock asphalt on self-healing behavior of asphalt mastics","authors":"Shixing Zhang , Jinchao Yue , Jiahui Wu , Ruixia Li","doi":"10.1016/j.conbuildmat.2021.124851","DOIUrl":null,"url":null,"abstract":"<div><p>In order to evaluate the influence of rock asphalt on the self-healing behavior of asphalt mastics, this study carried out the frequency sweep test, fatigue-healing test and complete process monitoring test of self-healing behavior for four different asphalt mastics. In addition, this study examined a proposed mechanism of self-healing from literatures. The results show that the optimum self-healing temperature of control asphalt mastic is identified as its near-Newtonian fluid transition temperature (slightly higher than softening point), while the optimum self-healing temperature of rock asphalt mastic is lower than its near-Newtonian fluid transition temperature and softening point, which indicates that rock asphalt mastic maximizes its self-healing potential before the near-Newtonian fluid state. This study models the self-healing behavior of the asphalt mastic considering the effect of healing temperature and time to verify the applicability of the capillary diffusion theory that explains the self-healing in asphalt mastics. The proposed model determined the rest times for full healing of asphalt mastics, and results indicate that the self-healing rate of asphalt mastic can be significantly increased by rock asphalt. The results of the self-healing behavior monitoring test and the parameters obtained from the proposed model both indicate that rock asphalt has some adverse effects on the self-healing behavior in the initial stage, but will promote the development of self-healing after a period of time. Overall, the addition of rock asphalt can improve the self-healing properties of asphalt mastic. Based on the aforementioned macroscopic results and the capillary diffusion theory, it can be concluded that the addition of rock asphalt negatively affects the wetting mechanism of self-healing, but positively influences the strength and efficiency of diffusive cohesive healing, thus effectively enhancing the self-healing behavior of asphalt mastic.</p></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"310 ","pages":"Article 124851"},"PeriodicalIF":7.4000,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"8","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Construction and Building Materials","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0950061821026027","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
引用次数: 8
Abstract
In order to evaluate the influence of rock asphalt on the self-healing behavior of asphalt mastics, this study carried out the frequency sweep test, fatigue-healing test and complete process monitoring test of self-healing behavior for four different asphalt mastics. In addition, this study examined a proposed mechanism of self-healing from literatures. The results show that the optimum self-healing temperature of control asphalt mastic is identified as its near-Newtonian fluid transition temperature (slightly higher than softening point), while the optimum self-healing temperature of rock asphalt mastic is lower than its near-Newtonian fluid transition temperature and softening point, which indicates that rock asphalt mastic maximizes its self-healing potential before the near-Newtonian fluid state. This study models the self-healing behavior of the asphalt mastic considering the effect of healing temperature and time to verify the applicability of the capillary diffusion theory that explains the self-healing in asphalt mastics. The proposed model determined the rest times for full healing of asphalt mastics, and results indicate that the self-healing rate of asphalt mastic can be significantly increased by rock asphalt. The results of the self-healing behavior monitoring test and the parameters obtained from the proposed model both indicate that rock asphalt has some adverse effects on the self-healing behavior in the initial stage, but will promote the development of self-healing after a period of time. Overall, the addition of rock asphalt can improve the self-healing properties of asphalt mastic. Based on the aforementioned macroscopic results and the capillary diffusion theory, it can be concluded that the addition of rock asphalt negatively affects the wetting mechanism of self-healing, but positively influences the strength and efficiency of diffusive cohesive healing, thus effectively enhancing the self-healing behavior of asphalt mastic.
期刊介绍：
Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged.
Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.
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