Activation energy of calcium sulfoaluminate cement-based materials

Date
2021-07-31
Authors
Wang, Kejin
Gui, Yu
Wang, Kejin
Al Qunaynah, Siraj
Muazu Bawa, Samaila
Tang, Shengwen
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Springer Nature
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Wang, Kejin
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Civil, Construction and Environmental Engineering
Abstract
In this study, calcium sulfoaluminate (CSA) cement pastes were tested for heat of hydration and chemical shrinkage at temperatures of 20 °C, 30 °C and 40 °C. Apparent activation energy (Ea) values were then calculated using both exponential and hyperbolic methods. The average Ea of the CSA cements ranged from 42.24 to 80.22 kJ/mol, much higher than that of Type I Portland cement (38–45 kJ/mol). Ea increased slightly with the replacement of silica fume for cement. However, average Ea decreased by 18.4% when 20% Class C fly ash was used, but increased by 21.3% when 40% Class C fly ash was used. Ea calculated from heat of hydration using the exponential method is 17% lower than that obtained using the hyperbolic method. When the exponential method was used, Ea values determined using heat of hydration were 30% higher than those obtained using chemical shrinkage.
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This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at DOI: 10.1617/s11527-021-01753-3. Copyright 2021 RILEM. Posted with permission.
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Calcium sulfoaluminate cement, Apparent activation energy, Heat of hydration, Chemical shrinkage
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