Wood ash-based binders for lightweight building materials: Evaluating the influence of hydraulic lime and cement on the setting and mechanical properties of wood ash pastes
The shift from fossil fuels to bioenergy has led to increased wood ash output. Since a large proportion of this waste ends up in landfills, recycling wood ash in construction materials is one of sustainable approaches of managing this by-product. However, the amount of biomass ashes currently recycl...
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Elsevier
2024-12-01
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| Series: | Results in Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123024009939 |
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| author | Désiré Ndahirwa Hafida Zmamou Hélène Lenormand Elise Chenot Sébastien Potel Nathalie Leblanc |
| author_facet | Désiré Ndahirwa Hafida Zmamou Hélène Lenormand Elise Chenot Sébastien Potel Nathalie Leblanc |
| author_sort | Désiré Ndahirwa |
| collection | DOAJ |
| description | The shift from fossil fuels to bioenergy has led to increased wood ash output. Since a large proportion of this waste ends up in landfills, recycling wood ash in construction materials is one of sustainable approaches of managing this by-product. However, the amount of biomass ashes currently recycled in building materials is still limited. This study therefore explored the feasibility of valorising four different types of wood ashes in large quantities in the production of lightweight building materials. Thirty pastes with different levels (80, 90, 95 and 100 wt%) of wood ash and (0, 5, 10 and 20 wt%) of natural hydraulic lime (NHL) or ordinary Portland cement (PC) were developed. Partial replacement of wood ash (WA) by NHL or PC accelerated the setting and improved the mechanical properties of blended pastes. The initial and final setting times decreased with increasing NHL or PC content in the mixes. The strength of the pastes increased with increasing NHL or PC levels and curing time. However, wood bottom ash (WBA) mixes were controversial because their mechanical properties gradually weakened over time. For WA-NHL blends, the 28-day flexural and compressive strength ranged from 0.02 to 1.12 MPa and from 0.05 to 2.59 MPa, respectively. On the other hand, for WA-PC pastes, the flexural and compressive strengths at 28 days varied from 0.07 to 2.72 MPa and from 0.13 to 5.49 MPa, simultaneously. These results prove that wood ash can be used effectively as a main component of binding matrices for lightweight building materials. |
| format | Article |
| id | doaj-art-a39c4cb6dd3e4910ab540fe4f307955a |
| institution | OA Journals |
| issn | 2590-1230 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Engineering |
| spelling | doaj-art-a39c4cb6dd3e4910ab540fe4f307955a2025-08-20T02:34:35ZengElsevierResults in Engineering2590-12302024-12-012410273810.1016/j.rineng.2024.102738Wood ash-based binders for lightweight building materials: Evaluating the influence of hydraulic lime and cement on the setting and mechanical properties of wood ash pastesDésiré Ndahirwa0Hafida Zmamou1Hélène Lenormand2Elise Chenot3Sébastien Potel4Nathalie Leblanc5UniLaSalle, Univ. Artois, ULR7519 - Transformations & Agro-ressources, Normandie Université, 3 Rue du Tronquet, 76130 Mont-Saint-Aignan, France; Corresponding author.UniLaSalle, Univ. Artois, ULR7519 - Transformations & Agro-ressources, Normandie Université, 3 Rue du Tronquet, 76130 Mont-Saint-Aignan, FranceUniLaSalle, Univ. Artois, ULR7519 - Transformations & Agro-ressources, Normandie Université, 3 Rue du Tronquet, 76130 Mont-Saint-Aignan, FranceUniLaSalle, B2R (U2R 7511) UPJV-UNIL, 19 Rue Pierre Waguet, 60000 Beauvais, FranceUniLaSalle, B2R (U2R 7511) UPJV-UNIL, 19 Rue Pierre Waguet, 60000 Beauvais, FranceUniLaSalle, Univ. Artois, ULR7519 - Transformations & Agro-ressources, Normandie Université, 3 Rue du Tronquet, 76130 Mont-Saint-Aignan, FranceThe shift from fossil fuels to bioenergy has led to increased wood ash output. Since a large proportion of this waste ends up in landfills, recycling wood ash in construction materials is one of sustainable approaches of managing this by-product. However, the amount of biomass ashes currently recycled in building materials is still limited. This study therefore explored the feasibility of valorising four different types of wood ashes in large quantities in the production of lightweight building materials. Thirty pastes with different levels (80, 90, 95 and 100 wt%) of wood ash and (0, 5, 10 and 20 wt%) of natural hydraulic lime (NHL) or ordinary Portland cement (PC) were developed. Partial replacement of wood ash (WA) by NHL or PC accelerated the setting and improved the mechanical properties of blended pastes. The initial and final setting times decreased with increasing NHL or PC content in the mixes. The strength of the pastes increased with increasing NHL or PC levels and curing time. However, wood bottom ash (WBA) mixes were controversial because their mechanical properties gradually weakened over time. For WA-NHL blends, the 28-day flexural and compressive strength ranged from 0.02 to 1.12 MPa and from 0.05 to 2.59 MPa, respectively. On the other hand, for WA-PC pastes, the flexural and compressive strengths at 28 days varied from 0.07 to 2.72 MPa and from 0.13 to 5.49 MPa, simultaneously. These results prove that wood ash can be used effectively as a main component of binding matrices for lightweight building materials.http://www.sciencedirect.com/science/article/pii/S2590123024009939Wood ashSetting timeFlexural strengthCompressive strengthWood ash-based pastes |
| spellingShingle | Désiré Ndahirwa Hafida Zmamou Hélène Lenormand Elise Chenot Sébastien Potel Nathalie Leblanc Wood ash-based binders for lightweight building materials: Evaluating the influence of hydraulic lime and cement on the setting and mechanical properties of wood ash pastes Results in Engineering Wood ash Setting time Flexural strength Compressive strength Wood ash-based pastes |
| title | Wood ash-based binders for lightweight building materials: Evaluating the influence of hydraulic lime and cement on the setting and mechanical properties of wood ash pastes |
| title_full | Wood ash-based binders for lightweight building materials: Evaluating the influence of hydraulic lime and cement on the setting and mechanical properties of wood ash pastes |
| title_fullStr | Wood ash-based binders for lightweight building materials: Evaluating the influence of hydraulic lime and cement on the setting and mechanical properties of wood ash pastes |
| title_full_unstemmed | Wood ash-based binders for lightweight building materials: Evaluating the influence of hydraulic lime and cement on the setting and mechanical properties of wood ash pastes |
| title_short | Wood ash-based binders for lightweight building materials: Evaluating the influence of hydraulic lime and cement on the setting and mechanical properties of wood ash pastes |
| title_sort | wood ash based binders for lightweight building materials evaluating the influence of hydraulic lime and cement on the setting and mechanical properties of wood ash pastes |
| topic | Wood ash Setting time Flexural strength Compressive strength Wood ash-based pastes |
| url | http://www.sciencedirect.com/science/article/pii/S2590123024009939 |
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