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Journal of Materials Science

, Volume 44, Issue 8, pp 2038–2045 | Cite as

Analysis of cubic and orthorhombic C3A hydration in presence of gypsum and lime

  • A. P. KirchheimEmail author
  • V. Fernàndez-Altable
  • P. J. M. Monteiro
  • D. C. C. Dal Molin
  • I. Casanova
Article

Abstract

Field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) have been used to study the microstructural changes and phase development that take place during the hydration of cubic (pure) and orthorhombic (Na-doped) tricalcium aluminate (C3A) and gypsum in the absence and presence of lime. The results demonstrate that important differences occur in the hydration of each C3A polymorph and gypsum when no lime is added; orthorhombic C3A reacts faster with gypsum than the cubic phase, forming longer ettringite needles; however, the presence of lime slows down the formation of ettringite in the orthorhombic sample. Additional rheometric tests showed the possible effects on the setting time in these cementitious mixes.

Keywords

Lime Gypsum Field Emission Scanning Electron Microscopy Ettringite Cement Hydration 

Notes

Acknowledgements

The authors acknowledge the financial support of CAPES (Fundação Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Ministério da Educação—Brasil) and CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico—Ministério da Ciência e Técnologia—Brasil). Also we are grateful to the staff of Electron Microscope Laboratory at University of California, Berkeley for helping in the acquisition of the images, and Oscar Reyes, from Technical University of Catalonia (UPC) on the rheological measurements. The research was supported by the National Science Foundation (grant CMS-981275) and KAUST.

Open Access

This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2009

Open AccessThis is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://doi.org/creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

Authors and Affiliations

  • A. P. Kirchheim
    • 1
    • 2
    Email author
  • V. Fernàndez-Altable
    • 3
  • P. J. M. Monteiro
    • 2
  • D. C. C. Dal Molin
    • 1
  • I. Casanova
    • 4
  1. 1.Department of Civil EngineeringFederal University of Rio Grande do SulPorto AlegreBrazil
  2. 2.Department of Civil and Environmental EngineeringUniversity of CaliforniaBerkeleyUSA
  3. 3.Laboratory of Construction MaterialsÉcole Polytechnique Fédérale de LausanneLausanneSwitzerland
  4. 4.Center for Research in Nanoengineering and School of Civil EngineeringTechnical University of Catalonia (UPC)Barcelona, CataloniaSpain

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