Evaluation of fillers for Magnesium Potassium Phosphate Cement (MKPC) for the encapsulation of low and intermediate level metallic radioactive wastes
Entity
UAM. Departamento de Geología y GeoquímicaPublisher
MDPIDate
2023-01-10Citation
10.3390/ma16020679
Materials 16.2 (2023): 679
ISSN
1996-1944 (print)DOI
10.3390/ma16020679Project
info:eu-repo/grantAgreement/EC/H2020/945098/EU//PREDIS; Gobierno de España. PID2020-116738RJ-I00Editor's Version
https://doi.org/10.3390/ma16020679Subjects
Magnesium Phosphate Cement; Metallic Radioactive Waste; Cement Filler; GeologíaRights
© 2023 by the authors. Licensee MDPI, Basel, SwitzerlandAbstract
This study investigates the effect of coal fly ash (FA), wollastonite (WO), pumice (PM), and metakaolin (MK) as filler materials in the rheological, mechanical, chemical, and mineralogical properties of a magnesium potassium phosphate cement (MKPC), designed for the encapsulation of low and intermediate level radioactive wastes containing reactive metals. Workability, compression strength, dimensional stability, pH, chemical composition, and mineralogical properties were studied in different pastes and mortars of MKPC with a fixed molar ratio of MgO/KH2PO4 = 1. No new mineral phases were found with the addition of the fillers, denoting their low chemical impact on the MKPC system. Moreover, all formulations with a water/cement mass ratio of <0.65 presented compressive strengths higher than 30 MPa after 90 days, and pH values lower than 8.5, corresponding to the passivation zone of aluminum corrosion
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Google Scholar:Dieguez, Mikel
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Ruiz García, Ana Isabel
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Cuevas Rodríguez, Jaime Fernando
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Alonso, María Cruz
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García-Lodeiro, Inés
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Fernández Martín, Raúl
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