Peat-wood fly ash as cold-region supplementary cementitious material:air content and freeze–thaw resistance of air-entrained mortars
| Autor: | Paivo Kinnunen, Mirja Illikainen, Katja Ohenoja, Jouni Rissanen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Cement
Peat Sustainable concrete Grinding Frost damage 0211 other engineering and technologies Air content 020101 civil engineering 02 engineering and technology Building and Construction Pulp and paper industry Combustion 0201 civil engineering Mechanics of Materials Fly ash 021105 building & construction Environmental science Freeze thaw resistance General Materials Science Cementitious Air entrainment Mortar Civil and Structural Engineering Biomass ash Frost resistance |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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