RT Journal Article
T1 Cements based on kaolinite waste
A1 García Giménez, Rosario
A1 Vigil de la Villa Mencía, Raquel
A1 Frías, Moises
A1 Martínez Ramírez, Sagrario
A1 Vegas Ramiro, Iñigo
A1 Fernández Carrasco, Lucía
AB The 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 2h 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.
SN 1680-7340
YR 2018
FD 2018-08-10
LA eng
NO García Giménez , R , Vigil de la Villa Mencía , R , Frías , M , Martínez Ramírez , S , Vegas Ramiro , I & Fernández Carrasco , L 2018 , ' Cements based on kaolinite waste ' , Advances in Geosciences , vol. 45 , pp. 133-138 . https://doi.org/10.5194/adgeo-45-133-2018
NO Publisher Copyright: © 2018 Copernicus GmbH. All rights reserved.
DS TECNALIA Publications
RD 29 sept 2024