Thermally activated dolomite as pozzolanic addition to Portland cement

Guillaume Jauffret*, Fredrik P. Glasser

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Dolomite (CaMg(CO3)(2)) is widespread in nature and can be thermally activated to form a product composed of an intimate mixture of periclase (MgO) and calcite (CaCO3). This mixture, referred to as 'half-burnt dolomite', can be obtained under specific experimental conditions of temperature and atmosphere composition. The decomposition product consists of nanometric platelets of periclase enclosed within a porous calcite matrix. The reactivity of half-burnt dolomite as a supplementary cementitious material depends on the size and accessibility to water of the periclase crystallites; both parameters are influenced by the conditions prevailing during partial decomposition, especially the extent of sintering, and by the initial properties of the dolomite. Under the experimental conditions used, the substitution of up to 20-25 mass% of cement by half-burnt dolomite was found to preserve the 28 d compressive strength of cement pastes, with maximum values being obtained for a substitution level around 10-15 mass% half-burnt dolomite.

Original languageEnglish
Pages (from-to)378-388
Number of pages11
JournalAdvances in Cement Research
Volume28
Issue number6
Early online date13 Apr 2016
DOIs
Publication statusPublished - Jun 2016

Keywords

  • blended cements
  • environmental aspects
  • hydration reactions
  • HALF-CALCINED DOLOMITE
  • VARIABLE ATMOSPHERES
  • FERROAN DOLOMITE
  • ANKERITE SERIES
  • DECOMPOSITION
  • HYDRATION
  • MGO
  • CONCRETE
  • KINETICS
  • CO2

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