Investigation of blended cement hydration by isothermal calorimetry and thermal analysis

Hydration of portland cement pastes containing three types of mineral additive; fly ash, ground-granulated slag, and silica fume was investigated using differential thermal analysis, thermogravimetric analysis (DTA/TGA) and isothermal calorimetry. It was shown that the chemically bound water obtaine...

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Bibliographic Details
Published in:Cement and concrete research 2005-06, Vol.35 (6), p.1155-1164
Main Authors: Pane, Ivindra, Hansen, Will
Format: Article
Language:English
Subjects:
Applied sciences
Blended cements
Buildings. Public works
Cement concrete constituents
Cements
DTA
Exact sciences and technology
Hydration
Materials
Pozzolan
Properties of anhydrous and hydrated cement, test methods
TGA
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Summary:Hydration of portland cement pastes containing three types of mineral additive; fly ash, ground-granulated slag, and silica fume was investigated using differential thermal analysis, thermogravimetric analysis (DTA/TGA) and isothermal calorimetry. It was shown that the chemically bound water obtained using DTA/TGA was proportional to heat of hydration and could be used as a measure of hydration. The weight loss due to Ca(OH) 2 decomposition of hydration products by DTA/TGA could be used to quantify the pozzolan reaction. A new method based on the composition of a hydrating cement was proposed and used to determine the degree of hydration of blended cements and the degree of pozzolan reaction. The results obtained suggested that the reactions of blended cements were slower than portland cement, and that silica fume reacted earlier than fly ash and slag.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2004.10.027