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Thermal analysis of blended cements
Fernández Carrasco, Lucía; Torrens Martín, David; Blanco Varela, Maria Teresa
Universitat Politècnica de Catalunya. Departament de Construccions Arquitectòniques I; Universitat Politècnica de Catalunya. LiTA - Laboratori d'Innovació i Tecnologia en l'Arquitectura
Hydration of blended cements from mixtures of Portland cement (PC), calcium aluminate cement (CAC) and calcium sulfate (CS) has been analyzed by thermal analysis in order to study the mechanism reactions at early ages. Several systems were studied, PC and PC/CAC ratios of 85/15 and 75/25, both with 0, 3 and 5 % of CS. The samples were cured during 6 h at 20 C and 98 % of relative humidity ambient; after that, a serial of samples were maintained at the same ambient but another serial were cured under distilled water during 7 days more. Joint to the thermal analysis, the supporting characterization techniques used were X-ray diffraction and infrared spectroscopy. The results have shown that these systems form an extra amount of ettringite when the amount of CS is higher. The presence of AFm depends on the initial amount of CAC and CS. The presence of higher amount of calcium aluminate provides the formation of AFm phases that is delayed when grows the CS presence.
Peer Reviewed
Àrees temàtiques de la UPC::Edificació::Materials de construcció::Ciment
Portland cement
Blended cements
Portland cement
Calcium aluminate cement
Calcium sulfate
Thermal analysis
Ciment pòrtland

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