University of Oulu

Ahmad Alzaza, Katja Ohenoja, Mirja Illikainen, One-part alkali-activated blast furnace slag for sustainable construction at subzero temperatures, Construction and Building Materials, Volume 276, 2021, 122026, ISSN 0950-0618,

One-part alkali-activated blast furnace slag for sustainable construction at subzero temperatures

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Author: Alzaza, Ahmad1; Ohenoja, Katja1; Illikainen, Mirja1
Organizations: 1Fiber and Particle Engineering Research Unit, Faculty of Technology, University of Oulu, P.O. Box 4300, 90014 Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.8 MB)
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Language: English
Published: Elsevier, 2021
Publish Date: 2021-01-26


The construction season is limited in northern countries due to the severe cold weather conditions and their detrimental impacts on concrete quality. Thus, there are excessive expenses required annually for insulation and energy-intensive heating systems for cold-weather concreting. This experimental study aimed to investigate the potential of using high-strength one-part alkali-activated blast furnace slag (AAS) in cold weather without the need for supplementary heating systems. Therefore, the impacts of different subzero curing temperatures on the hardened properties of one-part AAS mortar in comparison with cement mortar were assessed. After casting, mortars were immediately cured at a temperature of 23, −5, −10, and −20 °C, up to 56d. The results showed that the lower the curing temperature, the lower the UPV and compressive strength of cement and one-part AAS mortar; however when the curing period was fixed, one-part AAS mortar registered higher UPV and compressive strength than cement mortar at all curing temperatures. Owing to additional room temperature curing, the hardened properties of AAS mortar were significantly improved. The findings were further supported by microstructural and thermogravimetric analyses.

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Series: Construction & building materials
ISSN: 0950-0618
ISSN-E: 1879-0526
ISSN-L: 0950-0618
Volume: 276
Article number: 122026
DOI: 10.1016/j.conbuildmat.2020.122026
Type of Publication: A1 Journal article – refereed
Field of Science: 218 Environmental engineering
Funding: This work was done under the auspices of the ARCTIC-ecocrete project, which is supported by the Interreg Nord EU-program and the Regional Council of Lapland.
Copyright information: © 2020 Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 license