Calorimetric determination of the effect of additives on cement hydration process
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Possibilities of a multicell isoperibolic-semiadiabatic calorimeter application for the measurement of hydration heat and maximum temperature reached in mixtures of various compositions during their setting and early stages of hardening are presented. Measurements were aimed to determine the impact of selected components’ content on the course of ordinary Portland cement (OPC) hydration. The following components were selected for the determination of the hydration behaviour in mixtures: very finely ground granulated blast furnace slag (GBFS), silica fume (microsilica, SF), finely ground quartz sand (FGQ), and calcined bauxite (CB). A commercial polycarboxylate type superplasticizer was also added to the selected mixtures. All maximum temperatures measured for selected mineral components were lower than that reached for cement. The maximum temperature increased with the decreasing amount of components in the mixture for all components except for silica fume. For all components, except for CB, the values of total released heat were higher than those for pure Portland cement samples.
Keywordscalorimetry cement admixtures additives hydration
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- European Committee for Standardization (2003). European standard: Methods of testing cement — Part 8: Heat of hydration — Solution method. EN 196-8:2003 E. Brussels, Belgium.Google Scholar
- European Committee for Standardization (2010). European standard: Methods of testing cement — Part 9: Heat of hydration — Semi-adiabatic method. EN 196-9:2010 E. Brussels, Belgium.Google Scholar
- Gruyaert, E., Robeyst, N., & De Belie, N. (2008). Modelling the hydration heat of Portland cement blended with blastfurnace slag. In Non-traditional cement and concrete III, June 10–12, 2008 (pp. 302–311). Brno, Czech Republic: Brno University of Technology.Google Scholar
- Guan, B., Ye, Q., Zhang, J., Lou, W., & Wu, Z. (2010). Interaction between α-calcium sulfate hemihydrate and superplasticizer from the point of adsorption characteristics, hydration and hardening process. Cement and Concrete Research, 40, 253–259. DOI:10.1016/j.cemconres.2009.08.027.CrossRefGoogle Scholar
- Krátký, J. (2004). Vliv přísad na vlastnosti anorganicko organických kompozitů. Unpublished PhD. thesis, Brno University of Technology, Brno, Czech Republic.Google Scholar
- Vessalas, K., Thomas, P. S., Ray, A. S., Guerbois, J. P., Joyce, P., & Haggman, J. (2009). Pozzolanic reactivity of the supplementary cementitious material pitchstone fines by thermogravimetric analysis. Journal of Thermal Analysis and Calorimetry, 97, 71–76. DOI: 10.1007/s10973-008-9708-5.CrossRefGoogle Scholar
- Zingg, A., Holzer, L., Kaech, A., Winnefeld, F., Pakusch, J., Becker, S., & Gauckler, L. (2008). The microstructure of dispersed and non-dispersed fresh cement pastes — new insight by cryo-microscopy. Cement and Concrete Research, 38, 522–529. DOI:10.1016/j.cemconres.2007.11.007.CrossRefGoogle Scholar