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Comparing study on hydration properties of various cementitious systems

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Abstract

The hydration properties of slag sulfate cement (SSC), slag Portland cement (PSC), and ordinary Portland cement (POC) were compared in this study by determining the compressive strength of pastes, the hydration heat of binders within 72 h, the pore structure, the hydration products, and the hydration degree. The results indicated that main hydration products of PSC paste and POC paste are calcium hydroxide and C–S–H gel, while those of SSC paste are ettringite and C–S–H gel from the analyses of XRD, TG–DTA, and SEM. At the early curing age, the compressive strength depends on the clinker content in the cementitious system, while at the late curing age, which is related to the potential reactivity of slag. From hydration heat analysis, the cumulative hydration heat of PSC is lower than that of POC, but higher than that of SSC. Slag can limit chemical reaction and the delayed coagulation of gypsum, which also plays a role in the early hydration. So SSC shows the lowest heat release and slag can’t be simulated without a suitable alkaline solution. Based on MIP analysis, the porosity of POC paste is the smallest while the average pore size is the biggest. At the age of 90 days, the compressive strength of SSC can get higher development because of its relative smaller pore size than that of PSC and POC paste.

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Acknowledgements

This Project is funded by the National Natural Science Foundation of China (51208391) and the Opening Funds of State Key Laboratory of Silicate Building Materials (SYSJJ2012-11).

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Correspondence to Shuhua Liu.

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Liu, S., Wang, L., Gao, Y. et al. Comparing study on hydration properties of various cementitious systems. J Therm Anal Calorim 118, 1483–1492 (2014). https://doi.org/10.1007/s10973-014-4052-4

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  • DOI: https://doi.org/10.1007/s10973-014-4052-4

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