Greening effect of slag cement-based concrete: Environmental and ecotoxicological impact
| Autor: | Eric Meux, Julien Couvidat, Cécile Diliberto, Laurent Izoret, Clément Bojic, Sylvie Cotelle, André Lecomte |
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| Přispěvatelé: | Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Déchets Eaux Environnement Pollutions (DEEP), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA), Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Terre et Environnement de Lorraine (OTELo), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Association Technique de l'Industrie des Liants Hydrauliques (ATILH) |
| Rok vydání: | 2021 |
| Předmět: |
0211 other engineering and technologies
Soil Science 02 engineering and technology Plant Science 010501 environmental sciences 01 natural sciences Raphidocelis subcapitata Greening [CHIM.ANAL]Chemical Sciences/Analytical chemistry 021105 building & construction Leachate 0105 earth and related environmental sciences General Environmental Science Cement [SDE.IE]Environmental Sciences/Environmental Engineering Chemistry Slag [CHIM.MATE]Chemical Sciences/Material chemistry 6. Clean water 13. Climate action Ground granulated blast-furnace slag visual_art Environmental chemistry visual_art.visual_art_medium [SDV.TOX.ECO]Life Sciences [q-bio]/Toxicology/Ecotoxicology Leaching (metallurgy) Ecotoxicity |
| Zdroj: | Environmental Technology and Innovation Environmental Technology and Innovation, Elsevier, 2021, 22, pp.101467. ⟨10.1016/j.eti.2021.101467⟩ |
| ISSN: | 2352-1864 |
| Popis: | International audience; Materials containing ground granulated blast furnace slag (GGBFS) display a transient green–bluecolor after demolding. This greening effect has been investigated for leaching behavior and ecotoxicological impact. Color of concretes and pure pastes containing GGBFS was assessed with a portable spectrophotometer, and samples were then submitted to a tank monolith leaching test. Ecotoxicological tests were conducted on reference sample and a green concrete sample at both natural and adjusted pH of 8.1. Main results support that the temporary greening effect of GGBFS-containing materials has no particular impact neither on the chemistry of leachates, nor ecotoxicity. Additionally, alkaline leachates are the main issue of leached cement or GGBFS based materials with pH around 11.5–12.5. Alkaline pH is a preponderant factor of ecotoxicity to sensitive organisms such as Daphnia magna, immobilization assay (48 h) resulting in 5.10 Toxic Units (TU) for reference sample at pH 12.50 against 1.38 TU at pH 8.10. Furthermore, sulfides are a specific issue of GGBFS materials concentrated up to 0.94 mmol m−2 in leachates, having an ecotoxic impact on living organisms at all trophic levels. At pH 8.10, green concrete leachates have 4.85 TU for Raphidocelis subcapitata growth assay (sulfides concentration of 0.63 mmol m−2) against 3.0 TU for green concrete sample. However, sulfides are easily removed from natural solution by oxidation or evaporation. |
| Databáze: | OpenAIRE |
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