Long-Term Behavior of Concrete Containing Wood Biomass Fly Ash
Wood biomass is widely used in the European Union as a fuel for the production of heat and electrical energy, generating a considerable amount of ash. The disposal of ash, especially its finest fraction, requires proper engineering solutions, since these particles contain heavy metals and can<br&...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/24/12859 |
| _version_ | 1797461551909699584 |
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| author | Ivan Gabrijel Marijan Skazlić Nina Štirmer |
| author_facet | Ivan Gabrijel Marijan Skazlić Nina Štirmer |
| author_sort | Ivan Gabrijel |
| collection | DOAJ |
| description | Wood biomass is widely used in the European Union as a fuel for the production of heat and electrical energy, generating a considerable amount of ash. The disposal of ash, especially its finest fraction, requires proper engineering solutions, since these particles contain heavy metals and can<br>easily pollute soil, groundwater, or air. In this work, wood fly ash with a high amount of pozzolanic oxides and one with a high CaO content were used in concrete as a 15% and 30% cement replacement. Incorporation of wood ash in concrete reduced the 28-day compressive strength of concrete by up to 37%, which was attributed to the low stiffness of the wood ash particles, while the 2-year compressive strength indicated very low pozzolanic reactivity. The capillary absorption of concrete increased with the increase in the ash content, but almost no influence on the gas permeability was observed. Wood fly ash with high CaO content reduced the drying shrinkage of concrete by up to 65% after 1 year. In a mix with 30% of high CaO fly ash, swelling occurred in the first days of hydration, which was attributed to the volume expansion due to the formation of portlandite and brucite, but did not lead to cracking or a decrease in long-term compressive strength. |
| first_indexed | 2024-03-09T17:22:00Z |
| format | Article |
| id | doaj.art-542a731a550f4d7b9d94baa3f1e5dd6c |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T17:22:00Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-542a731a550f4d7b9d94baa3f1e5dd6c2023-11-24T13:05:57ZengMDPI AGApplied Sciences2076-34172022-12-0112241285910.3390/app122412859Long-Term Behavior of Concrete Containing Wood Biomass Fly AshIvan Gabrijel0Marijan Skazlić1Nina Štirmer2Faculty of Civil Engineering, University of Zagreb, Fra Andrije Kačića Miošića 26, 10000 Zagreb, CroatiaFaculty of Civil Engineering, University of Zagreb, Fra Andrije Kačića Miošića 26, 10000 Zagreb, CroatiaFaculty of Civil Engineering, University of Zagreb, Fra Andrije Kačića Miošića 26, 10000 Zagreb, CroatiaWood biomass is widely used in the European Union as a fuel for the production of heat and electrical energy, generating a considerable amount of ash. The disposal of ash, especially its finest fraction, requires proper engineering solutions, since these particles contain heavy metals and can<br>easily pollute soil, groundwater, or air. In this work, wood fly ash with a high amount of pozzolanic oxides and one with a high CaO content were used in concrete as a 15% and 30% cement replacement. Incorporation of wood ash in concrete reduced the 28-day compressive strength of concrete by up to 37%, which was attributed to the low stiffness of the wood ash particles, while the 2-year compressive strength indicated very low pozzolanic reactivity. The capillary absorption of concrete increased with the increase in the ash content, but almost no influence on the gas permeability was observed. Wood fly ash with high CaO content reduced the drying shrinkage of concrete by up to 65% after 1 year. In a mix with 30% of high CaO fly ash, swelling occurred in the first days of hydration, which was attributed to the volume expansion due to the formation of portlandite and brucite, but did not lead to cracking or a decrease in long-term compressive strength.https://www.mdpi.com/2076-3417/12/24/12859capillary absorptioncompressive strengthdrying shrinkagesupplementary cementitious materialswood biomass fly ash |
| spellingShingle | Ivan Gabrijel Marijan Skazlić Nina Štirmer Long-Term Behavior of Concrete Containing Wood Biomass Fly Ash Applied Sciences capillary absorption compressive strength drying shrinkage supplementary cementitious materials wood biomass fly ash |
| title | Long-Term Behavior of Concrete Containing Wood Biomass Fly Ash |
| title_full | Long-Term Behavior of Concrete Containing Wood Biomass Fly Ash |
| title_fullStr | Long-Term Behavior of Concrete Containing Wood Biomass Fly Ash |
| title_full_unstemmed | Long-Term Behavior of Concrete Containing Wood Biomass Fly Ash |
| title_short | Long-Term Behavior of Concrete Containing Wood Biomass Fly Ash |
| title_sort | long term behavior of concrete containing wood biomass fly ash |
| topic | capillary absorption compressive strength drying shrinkage supplementary cementitious materials wood biomass fly ash |
| url | https://www.mdpi.com/2076-3417/12/24/12859 |
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