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A platform for research: civil engineering, architecture and urbanism
Carbonation induced phase evolution in alkali-activated slag/fly ash cements: The effect of silicate modulus of activators
https://orcid.org/0000-0001-7145-0883
Highlights The effects of silicate modulus (Ms) on carbonation of AACs are studied. The carbonation rate and the amount of CaCO3 decrease with the increase of Ms. The carbonation behaviors of high-Ca systems are different from the low-Ca systems.
Abstract In this study, the effects of silicate modulus of activators (Ms) on carbonation of alkali-activated slag/fly ash cements are studied and compared between natural (0.03–0.04% CO2) and accelerated (1% CO2) carbonation conditions, via XRD, FTIR and TG/DTG techniques. Carbonation results in the decalcification of the C-A-S-H gels and the formation of calcium carbonates and silica gels, while the N-A-S-H gels are essentially constant after carbonation. The main calcium carbonate phase after carbonation is calcite, and the increase of Ms leads to the generation of vaterite and aragonite. The carbonation behaviors of low-calcium system (20% slag) are different from the high-Ca systems (100% and 60% slag), while the carbonation rate and the amount of calcium carbonates generally decrease with the increase of Ms in all of the studied systems. This investigation provides an in-depth understanding of carbonation mechanisms of alkali-activated cements, and is essential for the establishment of carbonation models and prediction of long-term performances.
Carbonation induced phase evolution in alkali-activated slag/fly ash cements: The effect of silicate modulus of activators
https://orcid.org/0000-0001-7145-0883
Highlights The effects of silicate modulus (Ms) on carbonation of AACs are studied. The carbonation rate and the amount of CaCO3 decrease with the increase of Ms. The carbonation behaviors of high-Ca systems are different from the low-Ca systems.
Abstract In this study, the effects of silicate modulus of activators (Ms) on carbonation of alkali-activated slag/fly ash cements are studied and compared between natural (0.03–0.04% CO2) and accelerated (1% CO2) carbonation conditions, via XRD, FTIR and TG/DTG techniques. Carbonation results in the decalcification of the C-A-S-H gels and the formation of calcium carbonates and silica gels, while the N-A-S-H gels are essentially constant after carbonation. The main calcium carbonate phase after carbonation is calcite, and the increase of Ms leads to the generation of vaterite and aragonite. The carbonation behaviors of low-calcium system (20% slag) are different from the high-Ca systems (100% and 60% slag), while the carbonation rate and the amount of calcium carbonates generally decrease with the increase of Ms in all of the studied systems. This investigation provides an in-depth understanding of carbonation mechanisms of alkali-activated cements, and is essential for the establishment of carbonation models and prediction of long-term performances.
Carbonation induced phase evolution in alkali-activated slag/fly ash cements: The effect of silicate modulus of activators
https://orcid.org/0000-0001-7145-0883
Highlights The effects of silicate modulus (Ms) on carbonation of AACs are studied. The carbonation rate and the amount of CaCO3 decrease with the increase of Ms. The carbonation behaviors of high-Ca systems are different from the low-Ca systems.
Abstract In this study, the effects of silicate modulus of activators (Ms) on carbonation of alkali-activated slag/fly ash cements are studied and compared between natural (0.03–0.04% CO2) and accelerated (1% CO2) carbonation conditions, via XRD, FTIR and TG/DTG techniques. Carbonation results in the decalcification of the C-A-S-H gels and the formation of calcium carbonates and silica gels, while the N-A-S-H gels are essentially constant after carbonation. The main calcium carbonate phase after carbonation is calcite, and the increase of Ms leads to the generation of vaterite and aragonite. The carbonation behaviors of low-calcium system (20% slag) are different from the high-Ca systems (100% and 60% slag), while the carbonation rate and the amount of calcium carbonates generally decrease with the increase of Ms in all of the studied systems. This investigation provides an in-depth understanding of carbonation mechanisms of alkali-activated cements, and is essential for the establishment of carbonation models and prediction of long-term performances.
Carbonation induced phase evolution in alkali-activated slag/fly ash cements: The effect of silicate modulus of activators
Zhang, Jian (author) / Shi, Caijun (author) / Zhang, Zuhua (author)
Construction and Building Materials ; 223 ; 566-582
2019-07-04
17 pages
Article (Journal)
Electronic Resource
English
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