Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/211637
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | Radioactivity and Pb and Ni immobilization in SCM-bearing alkali-activated matrices |
Autor: | Alonso López, Mª del Mar CSIC ORCID ; Pasko, A.; Gascó, C.; Suárez-Navarro, José Antonio; Kovalchuk, G.; Krivenko, Pavel V.; Puertas, Francisca CSIC ORCID | Palabras clave: | Alkali-activated materials NORM by-products Radiological characterization Red mud |
Fecha de publicación: | 2018 | Editor: | Elsevier | Citación: | Construction and Building Materials 159: 745-754 (2018) | Resumen: | Partial or total replacement of Portland cement clinker by SCMs (Supplementary Cementitious Materials) is a priority for the cement industry in its pursuit of global sustainable development and eco-friendly binder manufacture. The most widely used SCMs include industrial by-products such as blast furnace slag, fly ash and red mud. Alkali-activated cements manufactured with SCMs may reduce the need for Portland clinker by up to 90 wt%–100 wt% with no significant decline in material strength. The trade-off, however, is the risk of higher than legally allowable levels of radioactivity and unbound heavy metals (Cd, Hg, Ni, Pb, Cr), which may leach into the soil with the concomitant adverse implications for human health and the environment. This study assessed the mechanical strength, leachability and natural radioactivity of alkali-activated cement paste containing industrial waste-based SCMs (blast furnace slag, fly ash and red mud) and Pb and Ni compounds. Strength was highest in alkali-activated slag and slag/fly ash pastes and lowest in the red mud-containing materials. The addition of Pb or Ni sulphates had no adverse effect on this parameter. Alkaline and OPC pastes showed a high level of immobilization of both lead and nickel ions. According to the radiological findings, the Activity Concentration Index (I) was higher in red mud than in OPC, blast furnace slag or fly ash. With (I) values lower than 1, however, all the hydrated/activated materials studied would be EU directive-compliant. Nonetheless, the use of these new materials will depend not only on the activity concentration index, but also on their physical and chemical properties and the quality tests that must be passed to conform to legal requirements. | Versión del editor: | https://doi.org/10.1016/j.conbuildmat.2017.11.119 | URI: | http://hdl.handle.net/10261/211637 | DOI: | 10.1016/j.conbuildmat.2017.11.119 | ISSN: | 0950-0618 | E-ISSN: | 1879-0526 |
Aparece en las colecciones: | (IETCC) Artículos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
accesoRestringido.pdf | 59,24 kB | Adobe PDF | Visualizar/Abrir |
CORE Recommender
SCOPUSTM
Citations
30
checked on 20-abr-2024
WEB OF SCIENCETM
Citations
19
checked on 25-feb-2024
Page view(s)
112
checked on 24-abr-2024
Download(s)
27
checked on 24-abr-2024
Google ScholarTM
Check
Altmetric
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.