Hydration of Ordinary Portland Cements Made from Raw Mix Containing Transition Element Oxides

• Published in: Cement and concrete research Vol. 28; no. 3; pp. 335 - 340
• Main Authors: Kakali, G., Tsivilis, S., Tsialtas, A.
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Ltd 1998; Elsevier Science
• Subjects: Applied sciences; Buildings. Public works; Cement concrete constituents; Cements; Exact sciences and technology; Hydration; Materials; Properties of anhydrous and hydrated cement, test methods; Differential scanning calorimetry; Transition metals; Material composition; Hydration; Thermogravimetric analysis; Cement paste; Oxides; Experimental study; Portland cement; X ray diffraction; Cement raw mix
• ISSN: 0008-8846; 1873-3948
• DOI: 10.1016/S0008-8846(97)00250-0

The subject of this paper is the study of the hydration process in cements made from raw mixes containing transition element oxides. The oxides used are ZrO 2, V 2O 5, Ni 2O 3, CuO, Co 2O 3, MnO, Cr 2O 3, TiO 2, MoO 3, and ZnO, and their percentage in the raw mixes is 2% w/w. The cement pastes are cured in water for 24 h, 48 h, 7 days and 28 days. Hydration rate and products are studied by means of X-ray diffraction, differential scanning calorimetry, and thermogravimetric analysis. As it is concluded, the added oxides provoke, in general, a retardation of the hydration reactions. The effect is stronger during the first 2 days and becomes negligible at 28 days. The addition of CuO strongly delays the hydration even after 28 days. Its action is related to the formation of Cu(OH) 2 during the first days of hydration.