University of Oulu

Rissanen, J., Ohenoja, K., Kinnunen, P., & Illikainen, M. (2020). Peat-wood fly ash as cold-region supplementary cementitious material: Air content and freeze–thaw resistance of air-entrained mortars. Journal of Materials in Civil Engineering, 32(6), 04020119.

Peat-wood fly ash as cold-region supplementary cementitious material : air content and freeze–thaw resistance of air-entrained mortars

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Author: Rissanen, Jouni1; Ohenoja, Katja1; Kinnunen, Päivö1;
Organizations: 1Fibre and Particle Engineering, Faculty of Technology, Univ. of Oulu, P.O. Box 4300, Oulu 90014, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.2 MB)
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Language: English
Published: American Society of Civil Engineers, 2020
Publish Date: 2022-02-16


Fluidized bed combustion fly ash (FBCFA) is a promising industrial side stream to be used as a partial cement replacement material. Untreated and milled FBCFAs from cocombustion of peat and wood were used to replace 20% of portland cement in air-entrained and non-air-entrained mortars. Additionally, equivalent mortars containing fly ash from pulverized coal combustion (CFA) were prepared to compare FBCFAs with more conventional standardized cement replacement material. The study found that both FBCFAs produced mortars with similar compressive strengths compared to a reference, indicating that milling did not affect reactivity of ashes. Air-entrained FBCFA-containing mortars had about the same amount of entrained air compared to the reference mortar. FBCFAs outperformed CFA as a cement replacement material, which produced lower compressive strengths and reduced the amount of entrained air. Non-air-entrained mortar containing CFA suffered severe damage during the freeze–thaw (FT) experiment, unlike non-air-entrained mortars containing untreated or milled FBCFA. The addition of an air-entrainment agent improved FT resistance of all mortars, except those that contained milled FBCFA, which nevertheless had good FT resistance. This first-of-its-kind investigation of the suitability of peat-wood FBCFAs as a supplementary cementitious material in air-entrained mortars suggests a potential use of FBCFAs in cold-region concreting.

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Series: Journal of materials in civil engineering
ISSN: 0899-1561
ISSN-E: 1943-5533
ISSN-L: 0899-1561
Volume: 32
Issue: 6
Article number: 04020119
DOI: 10.1061/(ASCE)MT.1943-5533.0003189
Type of Publication: A1 Journal article – refereed
Field of Science: 215 Chemical engineering
216 Materials engineering
Funding: This work was done under the auspices of the ARCTIC-ecocrete project, which is supported by Interreg Nord EU-program and the Regional Council of Lapland. Jouni Rissanen gratefully acknowledges the financial support from the Fortum Foundation and Tauno Tönning’s Foundation. Mr. Jarno Karvonen and Mr. Jani Österlund are acknowledged for their contributions to the laboratory work.
Copyright information: © 2020, American Society of Civil Engineers. This material may be downloaded for personal use only. Any other use requires prior permission of the American Society of Civil Engineers. This material may be found at