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• W4226150213 endingPage "127358" @default.
• W4226150213 startingPage "127358" @default.
• W4226150213 abstract "This study investigates the effect of heat treatment on the kinetics of precipitation of the delayed ettringite in concrete structures and a chemical model for concrete expansion due to delayed ettringite formation (DEF). The expansion of concrete structures due to DEF majorly depends on the amount of sulfate, aluminate, and alkali content present in the cement. Apart from these parameters, environmental conditions like saturation, temperature, and duration of heat treatment also play a major role in the kinetics of the formation of delayed ettringite. The thermal energy, which is a function of concrete’s high temperature and its duration, can change the concrete’s microstructures affecting the kinetics of release of sulfate from the C-S-H gel. Such high temperature curing can also affect the leaching of alkali by modifying the pore structure. A comprehensive chemo-thermo-hygral model for DEF is discussed in this study based on study conducted by previous research. The previous model defines the kinetics of three major phenomenon related to DEF: dissolution of ettringite and monosulfate at high temperature; fixation of aluminate into hydrogarnet during the high-temperature curing; precipitation of delayed ettringite. In the current work, the model is integrated with a multi-component hydration heat model and a new thermal energy factor governing the precipitation kinetics which not only correlates well the final expansion with experimental values, but also closely simulates the kinetics of expansion. A multi-ionic transport model is considered for alkali equilibrium. Finally, the kinetics of DEF along with the chemical expansion is validated with the experimental results from literature." @default.
• W4226150213 created "2022-05-05" @default.
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• W4226150213 date "2022-05-01" @default.
• W4226150213 modified "2023-10-17" @default.
• W4226150213 title "The effect of heat treatment on the kinetics of the delayed ettringite formation – An improved chemo-thermal-hygral model" @default.
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• W4226150213 doi "https://doi.org/10.1016/j.conbuildmat.2022.127358" @default.
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