Pozzolanicity of finely ground lightweight aggregates |
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| Affiliation: | 1. Civil, Architectural, and Environmental Engineering, University of Miami, Coral Gables, FL 33146, USA;2. College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou, 350108, China;3. Civil and Construction Engineering, Oregon State University, Corvallis, OR 97331, USA;1. Department of Materials Engineering and Civil Construction, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG 31270-901, Brazil;2. Department of Metallurgical and Materials Engineering, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG 31270-901, Brazil;1. Vogel School of Engineering, Bryan College, 721 Bryan Drive, Dayton, TN 37321, United States of America;2. Post-doctoral Researcher, Civil and Construction Engineering, Oregon State University, 1491 SW Campus Way, Corvallis, OR 97331, United States of America;3. Civil and Architectural Engineering Department, University of Miami, 1251 Memorial Drive, Coral Gables, FL 33146, United States of America;4. Department of Civil Engineering, University of Arkansas, 4190 Bell Engineering Center, Fayetteville, AR 72701, United States of America;1. School of Civil and Construction Engineering, Oregon State University, Corvallis 97331, USA;2. Department of Civil, Architectural and Environmental Engineering, University of Miami, Coral Gables 33146, USA |
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| Abstract: | ![]()
This paper examines the pozzolanic behavior of finely ground lightweight aggregates with a mean particle size between 4 and 26 μm. Cement pastes are made with a 20% mass replacement of cement with finely ground lightweight aggregates, fly ash, quartz, and limestone in addition to a control paste with no cement replacement. Isothermal calorimetry, thermogravimetric analysis, and compressive strength testing as well as thermodynamic calculations are performed on these pastes. Isothermal calorimetry and compressive strength testing are shown to not be able to clearly distinguish and quantify the pozzolanic response of the finely ground lightweight aggregates, fly ash, quartz, and limestone when they are used in cement pastes. However, thermogravimetric analysis and thermodynamic calculations clearly show that the finely ground lightweight aggregates are pozzolanic through the consumption of calcium hydroxide. A pozzolanic reactivity test based on isothermal calorimetry also confirms that the finely ground lightweight aggregates are pozzolanic. These results indicate that finely ground lightweight aggregates are pozzolanic and could be used in concreting applications. |
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| Keywords: | Lightweight aggregates Pozzolan Supplementary cementitious materials Isothermal calorimetry Thermogravimetric analysis Thermodynamic modeling |
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