{"title":"混凝土坍落度试验-流变仪的定义?","authors":"Callum White, Janet M. Lees","doi":"10.1016/j.conbuildmat.2024.139839","DOIUrl":null,"url":null,"abstract":"<div><div>While the slump test is often used to evaluate fresh state concrete performance, it is not considered a rheometer because it relies on slump height as a characterisation parameter. This study presents phenomenological slump observations obtained through 24 experimental tests. The relationships between the dimensionless groups are investigated, and three flow regimes are identified: slumping (dimensionless slump below 0.55), intermediate (dimensionless slump between 0.55 and 0.65) and spreading (dimensionless slump exceeding 0.65). A relationship between viscosity, yield stress and slump cessation time is presented, and a novel digital approach to obtain cessation time using an accelerometer is proposed. The slump measured viscosity is compared to the viscosity obtained via a torque vane rheometer, and an average error of 10% is observed. This work demonstrates that by incorporating digital tools such as 3D reconstruction and accelerometers, the slump test can provide accurate measurements of yield stress and viscosity in practical settings.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"462 ","pages":"Article 139839"},"PeriodicalIF":8.0000,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"The concrete slump test—A rheometer by definition?\",\"authors\":\"Callum White, Janet M. Lees\",\"doi\":\"10.1016/j.conbuildmat.2024.139839\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>While the slump test is often used to evaluate fresh state concrete performance, it is not considered a rheometer because it relies on slump height as a characterisation parameter. This study presents phenomenological slump observations obtained through 24 experimental tests. The relationships between the dimensionless groups are investigated, and three flow regimes are identified: slumping (dimensionless slump below 0.55), intermediate (dimensionless slump between 0.55 and 0.65) and spreading (dimensionless slump exceeding 0.65). A relationship between viscosity, yield stress and slump cessation time is presented, and a novel digital approach to obtain cessation time using an accelerometer is proposed. The slump measured viscosity is compared to the viscosity obtained via a torque vane rheometer, and an average error of 10% is observed. This work demonstrates that by incorporating digital tools such as 3D reconstruction and accelerometers, the slump test can provide accurate measurements of yield stress and viscosity in practical settings.</div></div>\",\"PeriodicalId\":288,\"journal\":{\"name\":\"Construction and Building Materials\",\"volume\":\"462 \",\"pages\":\"Article 139839\"},\"PeriodicalIF\":8.0000,\"publicationDate\":\"2025-02-07\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Construction and Building Materials\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S095006182404981X\",\"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}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Construction and Building Materials","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S095006182404981X","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}
The concrete slump test—A rheometer by definition?
While the slump test is often used to evaluate fresh state concrete performance, it is not considered a rheometer because it relies on slump height as a characterisation parameter. This study presents phenomenological slump observations obtained through 24 experimental tests. The relationships between the dimensionless groups are investigated, and three flow regimes are identified: slumping (dimensionless slump below 0.55), intermediate (dimensionless slump between 0.55 and 0.65) and spreading (dimensionless slump exceeding 0.65). A relationship between viscosity, yield stress and slump cessation time is presented, and a novel digital approach to obtain cessation time using an accelerometer is proposed. The slump measured viscosity is compared to the viscosity obtained via a torque vane rheometer, and an average error of 10% is observed. This work demonstrates that by incorporating digital tools such as 3D reconstruction and accelerometers, the slump test can provide accurate measurements of yield stress and viscosity in practical settings.
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.