Hydration mechanics of sewage sludge ashes used as cement replacement
| Autor: | Thierry Chaussadent, Loic Divet, Arezki Tagnit-Hamou, Mickael Saillio, Mehdi Mejdi |
|---|---|
| Přispěvatelé: | Comportement Physico-chimique et Durabilité des Matériaux (MAST-CPDM), Université Gustave Eiffel, Université de Sherbrooke (UdeS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Alite
0211 other engineering and technologies 02 engineering and technology CENDRE D'ASSEMBLAGE engineering.material BOUE RESIDUAIRE Portlandite law.invention [SPI.MAT]Engineering Sciences [physics]/Materials chemistry.chemical_compound stomatognathic system AFM PHASE law 021105 building & construction BOUE General Materials Science CIMENT Dissolution KINETICS Cement CEMENT HYDRATION technology industry and agriculture Building and Construction 021001 nanoscience & nanotechnology Durability 6. Clean water PHASE ASSEMBLAGE Portland cement stomatognathic diseases [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering RESIDU INDUSTRIEL chemistry Chemical engineering Volume (thermodynamics) engineering INCINERATION 0210 nano-technology HYDRATATION SEWAGE SLUDGE ASHES Sludge |
| Zdroj: | Cement and Concrete Research Cement and Concrete Research, Elsevier, 2020, 135, pp.106115. ⟨10.1016/j.cemconres.2020.106115⟩ |
| ISSN: | 0008-8846 |
| DOI: | 10.1016/j.cemconres.2020.106115⟩ |
| Popis: | The influence of sewage sludge ash (SSA) on the hydration of Portland cement (OPC) was investigated in this study. Blending OPC with SSA was found to influence the kinetic of hydration, notably the alite dissolution. This retardation effect has been attributed to the presence of the orthophosphate ions (PO43−). However, SSA releases only a small fraction of PO43− into solution, which is deemed insufficient to precipitate calcium phosphates compounds on noticeable levels at least. On the other hand, an enhancement of the engineering-scale properties (i.e. mechanical and durability) and portlandite consumption are observed when SSA is used. This is explained by the formation of AFm phases, which leads to changes in the total volume of the solid and thus the properties of the systems. These experimental results were confirmed by thermodynamic modelling, showing that the additional alumina released by SSA results in the formation of higher amount of AFt and AFm phases. |
| Databáze: | OpenAIRE |
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