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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Mitigation of Microcracking in Alkali-Activated Combined Slag and Fly Ash Concretes for Good Performance in Winter Conditions
Author(s): Alexandre Rodrigue, Josée Duchesne, Benoit Fournier and Benoit Bissonnette
Publication: Special Publication
Appears on pages(s):
Keywords: Alkali-activated concrete; autogenous shrinkage; cracking
Abstract:Concerns regarding the higher shrinkage and early cracking of alkali-activated binders can become a major issue for resistance to de-icing salts scaling, freeze-thaw cycles and/or chemical attacks. Using the Damage Rating Index (DRI)
method, cracking has been quantified in concrete samples using a slag/fly ash binder activated with a combined sodium
hydroxide and sodium silicate solution. The decrease of the added water dosage and the fly ash content results in an increase in the DRI values in the presence of slag/fly ash binder. Alkali-activated pastes with the same binding phase characteristics were tested using the ASTM C1698 for the evaluation of the autogenous volume changes to explain the observed cracking. With a constant activator-to-binder ratio of 0.35, different added water-to-binder ratios (0.12, 0.14 and 0.16) and fly ash contents (20, 30, and 40 %) were investigated. Autogenous shrinkage was found to decrease with increasing water dosage and fly ash content.
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