A Thermogravimetric Method for Studying the Reaction between Fly-Ash and the Calcium Hydroxide Liberated on Hydration of Portland Cement
The method of analysis involves the conversion of calcium hydroxide into calcium carbonate using gaseous carbon dioxide, followed by the decomposition of the calcium carbonate formed. The amount of the latter is proportional to the amount of calcium hydroxide in the samples provided they are heated to 200°C before exposure to the carbon dioxide. In this way the carbonation of hydrated calcium silicates and aluminates in the samples is prevented. The method has been used to monitor the amount of calcium hydroxide in set Portland cement pastes and to study the amount of reaction between the calcium hydroxide liberated from Portland cement with fly ash in mortars.
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