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Advances in Geosciences An open-access journal for refereed proceedings and special publications
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Volume 45 | Copyright
Adv. Geosci., 45, 133-138, 2018
https://doi.org/10.5194/adgeo-45-133-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

  10 Aug 2018

10 Aug 2018

Cements based on kaolinite waste

Rosario García Giménez1, Raquel Vigil de la Villa Mencía1, Moises Frías2, Sagrario Martínez Ramírez3, Iñigo Vegas Ramiro4, and Lucía Fernández Carrasco5 Rosario García Giménez et al.
  • 1Dpto. Geología y Geoquímica, Facultad de Ciencias, Geomateriales Associated Unit CSIC-UAM, Universidad Autónoma, 28049 Madrid, Spain
  • 2Eduardo Torroja Institute for Construction Sciences (IETcc-CSIC), 28033 Madrid, Spain
  • 3Institute for the Structure of Matter (IEM-CSIC), 28006 Madrid, Spain
  • 4Tecnalia, Construction Unit, 48160 Derio, Spain
  • 5Centre de Recerca en Nanoenginyeria (CRnE), Universitat Politècnica de Catalunya – Barcelona TECH, 08028 Barcelona, Spain

Abstract. 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.

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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.
The cement industry involves high-energy consumption that generates high CO2 emissions into the...
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