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Thermogravimetry on calcined mass basis — hydrated cement phases and pozzolanic activity quantitative analysis

  • J. DweckEmail author
  • A. L. Cherem da Cunha
  • Carolina Afonso Pinto
  • J. Pereira Gonçalves
  • P. M. Büchler
Article

Abstract

When cement hydrated compositions are analyzed by usual initial mass basis TG curves to calculate mass losses, the higher is the amount of additive added or is the combined water content, the higher is the cement ‘dilution’ in the initial mass of the sample. In such cases, smaller mass changes in the different mass loss steps are obtained, due to the actual smaller content of cement in the initial mass compositions. To have a same mass basis of comparison, and to avoid erroneous results of initial components content there from, thermal analysis data and curves have to be transformed on cement calcined basis, i.e. on the basis of cement oxides mass present in the calcined samples or on the sample cement initial mass basis.

The paper shows and discusses the fundamentals of these bases of calculation, with examples on free and combined water analysis, on calcium sulfate hydration during false cement set and on quantitative evaluation and comparison of pozzolanic materials activity.

Keywords

calcined mass basis cement false set pozzolanic activity TG/DTG 

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2009

Authors and Affiliations

  • J. Dweck
    • 1
    Email author
  • A. L. Cherem da Cunha
    • 1
  • Carolina Afonso Pinto
    • 1
  • J. Pereira Gonçalves
    • 2
  • P. M. Büchler
    • 3
  1. 1.Rio de Janeiro Federal University, School of Chemistry, BlocoE do CT Sala E206Cidade UniversitáriaRio de JaneiroBrazil
  2. 2.Institute of Environmental Sciences and Sustainable DevelopmentBahia Federal UniversityBarreiras — SalvadorBrasil
  3. 3.Chemical Engineering DepartmentSão Paulo State UniversitySão PauloBrazil

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