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Strength - formulation correlations in magnesium phosphate cements for nuclear waste encapsulation
Nuclear waste streams consist of a diversity of physical and chemical forms, potentially requiring a toolbox approach in the application of materials to provide suitable matrices for their disposal. Magnesium Potassium Phosphate Cement (MKPC) is an alternative to Portland cement for encapsulation of specific wastes where lower free water content, lower internal pH or the immobilisation of radioactive isotopes as low-solubility phosphates minerals are desired properties. The aim of this work was to support mix design through establishing strength-formulation relationships for MKPC blends with pulverised fuel ash (pfa). This is achieved utilising relative density calculations based on measurements of bound water for the determination of the progression of the setting reactions and relating this to compressive strength development data for a variety of formulations. While 40% of the chemical reaction occurs in the first day after mixing, true strength development is found to occur much later as the initial reaction products merely gels the slurry until a critical relative density is reached and strengthening becomes substantial. Measured compressive strength values for the system have reached as high as 70 ± 5 MPa at 180 days of age.
Strength - formulation correlations in magnesium phosphate cements for nuclear waste encapsulation
Nuclear waste streams consist of a diversity of physical and chemical forms, potentially requiring a toolbox approach in the application of materials to provide suitable matrices for their disposal. Magnesium Potassium Phosphate Cement (MKPC) is an alternative to Portland cement for encapsulation of specific wastes where lower free water content, lower internal pH or the immobilisation of radioactive isotopes as low-solubility phosphates minerals are desired properties. The aim of this work was to support mix design through establishing strength-formulation relationships for MKPC blends with pulverised fuel ash (pfa). This is achieved utilising relative density calculations based on measurements of bound water for the determination of the progression of the setting reactions and relating this to compressive strength development data for a variety of formulations. While 40% of the chemical reaction occurs in the first day after mixing, true strength development is found to occur much later as the initial reaction products merely gels the slurry until a critical relative density is reached and strengthening becomes substantial. Measured compressive strength values for the system have reached as high as 70 ± 5 MPa at 180 days of age.
Strength - formulation correlations in magnesium phosphate cements for nuclear waste encapsulation
Montague, W. (author) / Hayes, M. (author) / Vandeperre, L.J. (author)
2014
11 Seiten, Bilder, Tabellen, 33 Quellen
Conference paper
English
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