Determination of carbonation profiles in non-hydraulic lime mortars using thermogravimetric analysis

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Abstract

The carbonation profile of material taken at various depths in a lime mortar specimen has been detd. at different times from manuf. using a novel, high-speed thermogravimetric anal. (TGA) method. While conventional phenolphthalein staining suggests a sharp boundary between carbonated and non-carbonated regions, the new TGA technique shows that up to 15% (wt./wt.) of portlandite remains uncarbonated at the exterior of the mortar and that the extent of carbonation declines linearly over up to 15 mm into the interior. The technique demonstrates the possibility of identifying the presence of Liesegang patterns by measuring variations in the concn. of Ca(OH)2 through the depth profile. [on SciFinder (R)]
Original languageEnglish
Pages (from-to)179-189
Number of pages11
JournalThermochimica Acta
Volume444
Issue number2
DOIs
Publication statusPublished - 2006

Keywords

  • USES (Uses) (detn. of carbonation profiles in non-hydraulic lime mortars using thermogravimetric anal.)
  • Mortar
  • lime mortar carbonation profile thermogravimetric analysis
  • unclassified)
  • PEP (Physical
  • Thermogravimetric analysis (detn. of carbonation profiles in non-hydraulic lime mortars using thermogravimetric anal.)
  • Carbonation
  • CPS (Chemical process)
  • Lime Role
  • PROC (Process)
  • engineering or chemical process)
  • NUU (Other use

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