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• W3205814814 abstract "This paper presents a new method for assessing the compositional changes of carbonated cement pastes subjected to high temperatures. In this new method, in-situ Raman mapping combined with X-ray photoelectron spectroscopy (XPS) was used to monitor the phase transformation in carbonated cement pastes subjected to various high temperatures from 30 to 950 °C. Two kinds of carbonated areas, i.e., vaterite dominated and calcite dominated, were found in the in-situ Raman measurements. With the elevation in temperature, most of the vaterite was converted to calcite at 500 °C and completely decomposed at 600 °C, while the decomposition of calcite started at 600 °C and finished at 720 °C. Meanwhile, the depolymerization of the calcium modified silica gel to the silicate phases with a lower degree of polymerization was initiated at 500 °C, which led to the crystallization of β-C 2 S at 600 °C. The generation of β-C 2 S was found to increase with the elevation in temperature and became the dominant phase at 950 °C. In conclusion, the high temperature could affect the stability of carbonated cement pastes at 500 °C and above. The in-situ Raman mapping measurement has provided an extraordinary view of the spatial distribution of interesting phases subjected to high temperatures in a non-destructive way, which should be more consistent with the true condition in the material. • With the elevation in temperature, the vaterite polymorph was first converted to calcite at 500 °C and then completely decomposed at 600 °C, while the decomposition of calcite polymorph started at 600 °C and finished at 720 °C. • The calcium modified silica gel was unchanged below 400 °C but depolymerized to silicate phases with a lower degree of polymerization at 500 °C followed by a crystallization to β-C 2 S at 600 °C. The crystallization of β-C 2 S was found to be more obvious with higher temperatures. • The in-situ Raman mapping measurement employed in this study has provided an advanced, non-destructive, and time-saving method to detect the compositional changes subjected to high temperatures and has the potential to be applied to other materials." @default.
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• W3205814814 date "2022-01-01" @default.
• W3205814814 modified "2023-09-27" @default.
• W3205814814 title "Assessment of compositional changes of carbonated cement pastes subjected to high temperatures using in-situ Raman mapping and XPS" @default.
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• W3205814814 doi "https://doi.org/10.1016/j.jobe.2021.103454" @default.
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