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Cements based on kaolinite waste

AutorGarcía, Rosario; Vigil, R.; Frías, Moisés; Martínez-Ramírez, S. ; Vegas, Íñigo; Fernández, Lucía
Fecha de publicación10-ago-2018
EditorEuropean Geosciences Union
CitaciónAdvances in Geosciences 45: 133-138 (2018)
ResumenThe cement industry involves high-energy consumption that generates high CO2 emissions into the atmosphere. Environmental concerns can be addressed by replacing parts of Portland cement clinkers with pozzolanic materials in mortars and concrete. Slag, fly ash and silica fume are materials considered for the planned replacement. Research studies on clay minerals, such as kaolinite, are being followed with special attention by the scientific community and the cement industry. It is well known that these minerals require an activation process to transform kaolinite (K) into metakaolinite (MK). MK is an amorphous material from the transformation of K with high pozzolanic activity, which is its capacity to react with the portlandite released during the hydration of Portland cement, generating compounds such as C¿S¿H gels and some aluminum-phase hydrates. One of the MK production methods is heat treatment controlled by kaolinite at temperatures in the range of 600¿900 C. Different residues have been used (coal mining, paper sludge and waste from a drinking water treatment plant) activated at 600 C for 2 h to elaborate blended cements. Due to their good behaviour as future eco-efficient additions, this research is a study by x-ray fluorescence (XRF), x-ray diffraction (XRD) and scanning electron microscopy (SEM) of their influence on the performances of blended cement mixtures (binary and ternary one), with substitutions of pozzolan ratio at 28 days of hydration. The porosity of pozzolanic cements decreases because of the formation of hydrated phases during pozzolanic reaction.
Descripción6 pags., 3 figs., 5 tabs. -- Open Access funded by Creative Commons Atribution Licence 4.0. -- Special issue statement. This article is part of the special issue “European Geosciences Union General Assembly 2018, EGU Division Energy, Resources & Environment (ERE)”. It is a result of the EGU General Assembly 2018, Vienna, Austria, 8–13 April 2018.
Versión del editorhttps://doi.org/10.5194/adgeo-1-1-2018
Identificadoresdoi: 10.5194/adgeo-45-133-2018
issn: 1680-7340
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