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Activation energy of calcium sulfoaluminate cement-based materials
https://orcid.org/http://orcid.org/0000-0002-2386-5627
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.
Activation energy of calcium sulfoaluminate cement-based materials
https://orcid.org/http://orcid.org/0000-0002-2386-5627
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.
Activation energy of calcium sulfoaluminate cement-based materials
https://orcid.org/http://orcid.org/0000-0002-2386-5627
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.
Activation energy of calcium sulfoaluminate cement-based materials
Mater Struct
Liao, Yishun (author) / Gui, Yu (author) / Wang, Kejin (author) / Al Qunaynah, Siraj (author) / Bawa, Samaila Muazu (author) / Tang, Shengwen (author)
2021-08-01
Article (Journal)
Electronic Resource
English
Activation energy of calcium sulfoaluminate cement-based materials
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