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Quantitative analysis of accelerated carbonation products of the synthetic calcium silicate hydrate(C–S–H) by QXRD and TG/MS

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Abstract

In this study, calcium silicate hydrate(C–S–H) with CaO/SiO2 ratio of 1.5 target mixture is synthesized and C1.27SH0.76 with 93.4 % purity is obtained. The dried C–S–H was compacted at 8 MPa to 20 mm × 20 mm × 20 mm for accelerated carbonation. The carbonation products and carbonation degree of synthetic calcium silicate hydrate are characterized and quantitatively evaluated by QXRD (Rietveld refinement), mass gain method, and TG/MS analysis. After accelerated carbonation at 0.2 MPa CO2 pressure for 2 h, the carbonation degree from mass gain method is 71.5 %, and from TG/MS analysis is 78.0 %. Calcite, aragonite, vaterite, and amorphous phase exist simultaneously in the accelerated carbonated samples, accounting for 33.98, 17.13, 18.74, and 30.15 %, respectively. Two mass-loss stages were observed for calcium carbonate decomposition. The first mass-loss stage (300–660 °C range) was mainly caused by the decomposition of aragonite and vaterite, and calcite formed in the accelerated carbonation process has a relatively high decomposition temperature which is mainly centered in the 660–800 °C range.

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Acknowledgements

This work was financed by National Natural Science Foundation of China (51172096), the Ministry of education program for New Century Excellent Talents and the Fundamental Research Funds for the Central Universities.

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  1. School of Civil Engineering, Dalian University of Technology, Dalian, 116024, Liaoning, China

    Jun Chang & Yanfeng Fang

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  1. Jun Chang
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  2. Yanfeng Fang
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Correspondence to Jun Chang.

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Chang, J., Fang, Y. Quantitative analysis of accelerated carbonation products of the synthetic calcium silicate hydrate(C–S–H) by QXRD and TG/MS. J Therm Anal Calorim 119, 57–62 (2015). https://doi.org/10.1007/s10973-014-4093-8

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  • DOI: https://doi.org/10.1007/s10973-014-4093-8

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