Shrinkage of alkali-activated slag-fly ash concrete cured at ambient temperature

openaccess, Vol. 624 (8) 2024 / poniedziałek, 2 września, 2024

Skurcz betonu z aktywowanym alkalicznie spoiwem żużlowo-popiołowym pielęgnowanego w temperaturze otoczenia

(Open Access)

DOI: 10.15199/33.2024.08.01

citation/cytuj: Rodrigue A., Bissonnette B., Duchesne J., Fournier B. Shrinkage of alkali-activated slag-fly ash concrete cured at ambient temperature. Materiały Budowlane. 2024. Volume 624. Issue 8. Pages 1-4. DOI: 10.15199/33.2024.08.01

The paper summarizes the results of a study intended to characterize alkali-activated slag/fly ash concretes concerning their volume changes, freeze-thaw resistance, scaling resistance, and alkali-aggregate reactivity. The manifestation of early-age microcracking in the hardened alkali-activated paste phase of these concretes calls for attention. It is related to significant autogenous shrinkage, although it does not appear to agree with the other shrinkagemeasurements performed in the experimental program. Smaller pores and high sodiumion concentration result in higher internal pressure during the process of self-desiccation and could be the main causes for the very high autogenous shrinkage values recorded.

W artykule przedstawiono wyniki badań betonu z alkalicznym spoiwem żużlowo-popiołowym. Oznaczono zmianę objętości, odporność na cykle zamrażania-rozmrażania, w tym na złuszczanie, oraz reaktywność alkaliczno-krzemianową. Zwrócono uwagę na występowanie mikropęknięć w stwardniałym zaczynie we wczesnym wieku. Wysunięto hipotezę, że jest to związane ze znacznym skurczem autogenicznym, jakkolwiek inne pomiary skurczu, przeprowadzone w programie badawczym, nie potwierdzają tego mechanizmu. Małe pory i duże stężenie jonów sodu powodują wysokie ciśnienie wewnętrzne podczas wysychania i mogą być głównymi przyczynami dużych wartości skurczu autogenicznego zarejestrowanych w badaniach.
alkali-activated materials; fly ash; shrinkage; slag.

materiały aktywowane alkalicznie; popiół lotny; skurcz; żużel.
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dr Alexandre Rodrigue, Hydro-Québec, Baie-Comeau (QC), Canada
ORCID: 0000-0003-4911-4159
prof. Benoit Bissonnette, Laval University, Department of Civil Engineering and Water Engineering, Quebec City (QC), Canada
ORCID: 0000-0001-6555-3966
prof. Josée Duchesne, Laval University, Department of Geology and Geological Department, Quebec City (QC), Canada
ORCID: 0000-0002-6327-4864
prof. Benoit Fournier, Laval University, Department of Geology and Geological Department, Quebec City (QC), Canada
ORCID: 0000-0003-1469-4755

prof. Benoit Bissonnette, Laval University, Department of Civil Engineering and Water Engineering, Quebec City (QC), Canada
ORCID: 0000-0001-6555-3966

Corespondence address: benoit.bissonnette@gci.ulaval.ca

Full paper:

DOI: 10.15199/33.2024.08.01

Article in PDF file

Received: 20.05.2024
Revised: 28.06.2024
Published: 21.08.2024