ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Calorimetric determination of the effect of additives on cement hydration process

Pavel Šiler, Josef Krátký, Iva Kolářová, Jaromír Havlica, and Jiří Brandštetr

Centrum for Materials Research, Project ERDF CZ.1.05/2.1.00/01.0012, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, 621 00, Brno, Czech Republic

E-mail: siler@fch.vutbr.cz

Abstract: 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.

Keywords: calorimetry – cement – admixtures – additives – hydration

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-012-0256-x

Chemical Papers 67 (2) 213–220 (2013)