{"title":"评估含有脲醛/环氧微胶囊的活性粉末混凝土的自愈合能力","authors":"H. Khosravi, Effat Mehrazin, M. Lezgy-Nazargah","doi":"10.1680/jmacr.23.00302","DOIUrl":null,"url":null,"abstract":"The use of microcapsules as a preservative agent for healing materials has led to a great revolution in the repair of materials. Microcapsules have been used in medicine, agriculture, metallurgy, and mechanics. In civil engineering applications, microcapsules are usually used for the self-healing of concrete, asphalt and cementitious materials. Concrete and cement are widely used in civil engineering and they are distinguished as the predominant construction materials worldwide. The objective of this study is to design and produce urea-formaldehyde microcapsules for the recovery of reactive powder concrete (RPC). The obtained results demonstrated that the RPC specimens containing microcapsules exhibit different behaviors, compared to RPC specimens without microcapsules. For all RPC specimens containing microcapsule, measured values of strengths were lower than specimens without microcapsules. The minimum reduction in the compressive strength was observed in specimens with microcapsules content ranging from 4% to 6% by cement weight. The healing ratio of the compressive strength increased by increasing the weight percentage of microcapsules. Scanning electron microscope (SEM) imaging and energy dispersive spectroscopy (EDS) analysis were used to observe the process of crack healing. The SEM/EDS results showed that cracks are filled by healing products.","PeriodicalId":1,"journal":{"name":"Accounts of Chemical Research","volume":"11 24","pages":""},"PeriodicalIF":16.4000,"publicationDate":"2024-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Evaluation of self-healing in reactive powder concrete with urea-formaldehyde/epoxy microcapsules\",\"authors\":\"H. Khosravi, Effat Mehrazin, M. Lezgy-Nazargah\",\"doi\":\"10.1680/jmacr.23.00302\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The use of microcapsules as a preservative agent for healing materials has led to a great revolution in the repair of materials. Microcapsules have been used in medicine, agriculture, metallurgy, and mechanics. In civil engineering applications, microcapsules are usually used for the self-healing of concrete, asphalt and cementitious materials. Concrete and cement are widely used in civil engineering and they are distinguished as the predominant construction materials worldwide. The objective of this study is to design and produce urea-formaldehyde microcapsules for the recovery of reactive powder concrete (RPC). The obtained results demonstrated that the RPC specimens containing microcapsules exhibit different behaviors, compared to RPC specimens without microcapsules. For all RPC specimens containing microcapsule, measured values of strengths were lower than specimens without microcapsules. The minimum reduction in the compressive strength was observed in specimens with microcapsules content ranging from 4% to 6% by cement weight. The healing ratio of the compressive strength increased by increasing the weight percentage of microcapsules. Scanning electron microscope (SEM) imaging and energy dispersive spectroscopy (EDS) analysis were used to observe the process of crack healing. The SEM/EDS results showed that cracks are filled by healing products.\",\"PeriodicalId\":1,\"journal\":{\"name\":\"Accounts of Chemical Research\",\"volume\":\"11 24\",\"pages\":\"\"},\"PeriodicalIF\":16.4000,\"publicationDate\":\"2024-08-10\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Accounts of Chemical Research\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://doi.org/10.1680/jmacr.23.00302\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Accounts of Chemical Research","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1680/jmacr.23.00302","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
Evaluation of self-healing in reactive powder concrete with urea-formaldehyde/epoxy microcapsules
The use of microcapsules as a preservative agent for healing materials has led to a great revolution in the repair of materials. Microcapsules have been used in medicine, agriculture, metallurgy, and mechanics. In civil engineering applications, microcapsules are usually used for the self-healing of concrete, asphalt and cementitious materials. Concrete and cement are widely used in civil engineering and they are distinguished as the predominant construction materials worldwide. The objective of this study is to design and produce urea-formaldehyde microcapsules for the recovery of reactive powder concrete (RPC). The obtained results demonstrated that the RPC specimens containing microcapsules exhibit different behaviors, compared to RPC specimens without microcapsules. For all RPC specimens containing microcapsule, measured values of strengths were lower than specimens without microcapsules. The minimum reduction in the compressive strength was observed in specimens with microcapsules content ranging from 4% to 6% by cement weight. The healing ratio of the compressive strength increased by increasing the weight percentage of microcapsules. Scanning electron microscope (SEM) imaging and energy dispersive spectroscopy (EDS) analysis were used to observe the process of crack healing. The SEM/EDS results showed that cracks are filled by healing products.
期刊介绍:
Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance.
Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.