Can we consider the percentage of mass loss between 420 ⁰C to 500 ⁰C as the percentage of calcium hydroxide? or any other method are there to calculate the percentage of calcium hydroxide from TG curve?
This is about the temperature range in which calcium hydroxyde dehydroxylates. So the mass loss is not the amount of Ca(OH)2 but the water loss according to:
Ca(OH)2=> H2O + CaO, from the amount of water lost you can recalculate the amount of Ca(OH)2.
However, depending on your matrix there could be other minerals contributing to mass loss in this range, for example Brucite or Hydrotalcite. Also the temperature range can vary a bit with sample mass and heating speed depending on the device used. I would suggest "A Practical Guide to Microstructural Analysis of
Cementitious Materials" for a more through introduction.
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