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Quantitative thermal analysis of α-C2SH as a precursor for low-energy cements

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Abstract

In this work, a combined method of using DSC, TG and XRD analysis in order to determine an amount of decomposed α-C2SH in its tribochemically activated mixture with quartz is presented. Furthermore, the influence of the grinding on the phase transition and heat flow during the hydration of this mixture is determined. The results showed that the product in which α-C2SH prevails is obtained after 12 h of the hydrothermal synthesis at 200 °C in stirred (50 rpm) suspensions. The purification of mentioned product using distilled water (water/solid = 500) for 5 min is enough to eliminate remaining Ca(OH)2. The stability of α-C2SH during the purification was confirmed using DSC and XRD analysis. A strong correlation between heat absorption values of the α-C2SH decomposition at 470 °C and its quantity in the mixture with quartz was noticed (R 2 = 0.9929). According to the plotted calibration curve, the amount of decomposed α-C2SH during the tribochemical activation was determined: within the first minute, it reaches 32.28 % and gradually increases to 48.73 % after 20 min. During the decomposition of α-C2SH, the semi-crystalline calcium silicate hydrates form, which recrystallize to wollastonite at 850 °C; meanwhile, the remaining α-C2SH transforms to larnite. The complex tribochemical and thermal activation of α-C2SH–quartz mixture leads to a vivid increment of its hydraulic activity: the heat flow of the main hydration reaction and the total heat values reached 3.1 mW g−1 and 104.48 J g−1, respectively.

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Acknowledgements

This research was funded by a Grant (No. MIP – 077/2012) from the Research Council of Lithuania.

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  1. Department of Silicate Technology, Kaunas University of Technology, Radvilenu pl. 19, 50254, Kaunas, Lithuania

    R. Gendvilas, R. Siauciunas & K. Baltakys

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  1. R. Gendvilas
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  2. R. Siauciunas
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  3. K. Baltakys
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Correspondence to R. Gendvilas.

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Gendvilas, R., Siauciunas, R. & Baltakys, K. Quantitative thermal analysis of α-C2SH as a precursor for low-energy cements. J Therm Anal Calorim 121, 155–162 (2015). https://doi.org/10.1007/s10973-015-4570-8

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