Spectroscopic identification of Ca-bearing uranyl silicates formed in C–S–H systems by Antonia S. Yorkshire, Martin C. Stennett, Brant Walkley, John L. Provis, Luke T. Townsend, Latham T. Haigh, Neil C. Hyatt, Lucy M. Mottram, Claire L. Corkhill

“…At moderate or high Ca/Si ratios, uranophane-type uranyl silicates or Ca-uranates dominated, while at the lowest Ca/Si ratios, the formation of a Ca-bearing uranyl silicate mineral, similar to haiweeite (Ca[(UO2)2Si5O12(OH)2]·3H2O) or Ca-bearing weeksite (Ca2(UO2)2Si6O15·10H2O) was identified. This study highlights the influence of Ca/Si ratio on uranyl sequestration, of interest in the development of post-closure safety models for U-bearing radioactive waste disposal.…”
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Dr. Marina: comparing the Covid-19 R0 in the past 2 to 4 weeks, it reflects the effectiveness of measures by China Press

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