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Comparison of reaction degrees of slag and fly ash obtained by thermogravimetry and selective dissolution

Author(s): Yury Villagrán Zaccardi, Elke Gruyaert, Nele De Belie
Paper category: Proceedings
Book title: Proceedings of the International RILEM Conference
Materials, Systems and Structures in Civil Engineering 2016
Segment on Concrete with Supplementary Cementitious Materials
Editor(s): Ole M. Jensen, Konstantin Kovler and Nele De Belie
e-ISBN: 978-2-35158-179-7
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 64-73
Total Pages: 10
Language : English

Abstract: The evolution of the reaction degree of supplementary cementitious materials (SCM) with time is an important aspect regarding the design and use of blended cements. However, this quantification is complex due to the multiple actions of SCM in the cementitious system, such as the filler effect, the consumption of CH and the formation of secondary calcium silicate hydrates. In this sense, different methods for the estimation of the reaction degree may be recommended for each type of SCM. Some of them are indirect methods that quantify hydration products and compute a reaction degree on that basis, e.g. thermogravimetric analysis, and others are direct methods that measure the amount of unreacted SCM, e.g. selective dissolution. In this paper, thermogravimetric analysis and selective dissolution are applied to estimate the reaction degree of cement pastes admixed with 40% slag or 30% fly ash. Curing periods ranged from 1 till 90 days. Results from both methods are compared and some comments on practicalities for their application are made. Although not enough evidence could be collected for any of the applied methods to be considered as a reference method, the simultaneous application of these two techniques offers increased reliability than when only one method is applied.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00

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