Investigation of Blended Cement Hydration by Isothermal Calorimetry and Thermal Analysis

Blended cements are widely used in pavement and bridge deck constructions. This article reports on a study that investigated the hydration of portland cement pastes containing three types of mineral additives: fly ash, ground-granulated slag, and silica fume. The study used differential thermal analysis, thermogravimetric analysis (DTA/TGA) and isothermal calorimetry. The authors found 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. The authors propose a new method based on the composition of a hydrating cement. This method can be used to determine the degree of hydration of blended cements and the degree of pozzolan reaction. Overall hydration is retarded by the presence of pozzolans, particularly in the paste containing ground-granulated slag. They conclude that the reactions of blended cements were slower than Portland cement, and that silica fume reacted earlier than fly ash and slag.

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  • Authors:
    • Pane, Ivindra
    • Hansen, Will
  • Publication Date: 2005-6


  • English

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  • Accession Number: 01003020
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 3 2005 10:56AM