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Dissolution-precipitation behaviour of ettringite, monosulfate, and calcium silicate hydrate
AbstractThe stability of the cement minerals ettringite, monosulfate, and calcium silicate hydrate (C-S-H) was investigated to better understand the uptake of contaminants in waste–cement mixes. Suspensions were spiked with radioisotopes of components (45Ca and 35SO4 for ettringite and monosulfate and 45Ca and 32Si for C-S-H) to observe their uptake behaviour within 0–70 days. A physical model was applied to determine dissolution-precipitation rates. An initial fast uptake was observed to occur in most systems, so the data obtained between 7 and 70 days were chosen for analysis. Dissolution-precipitation rates were in the range of 10−11.5 to 10−12.2 mol m−2 s−1 for all minerals. The whole solids would be dissolved and reprecipitated within 1–4 years. The measured dissolution-precipitation rates of pure cement minerals give the maximum rate for ion substitution processes with contaminants and are distinguishable from faster processes such as surface complexation and ion exchange processes.
Dissolution-precipitation behaviour of ettringite, monosulfate, and calcium silicate hydrate
AbstractThe stability of the cement minerals ettringite, monosulfate, and calcium silicate hydrate (C-S-H) was investigated to better understand the uptake of contaminants in waste–cement mixes. Suspensions were spiked with radioisotopes of components (45Ca and 35SO4 for ettringite and monosulfate and 45Ca and 32Si for C-S-H) to observe their uptake behaviour within 0–70 days. A physical model was applied to determine dissolution-precipitation rates. An initial fast uptake was observed to occur in most systems, so the data obtained between 7 and 70 days were chosen for analysis. Dissolution-precipitation rates were in the range of 10−11.5 to 10−12.2 mol m−2 s−1 for all minerals. The whole solids would be dissolved and reprecipitated within 1–4 years. The measured dissolution-precipitation rates of pure cement minerals give the maximum rate for ion substitution processes with contaminants and are distinguishable from faster processes such as surface complexation and ion exchange processes.
Dissolution-precipitation behaviour of ettringite, monosulfate, and calcium silicate hydrate
Baur, Isabel (author) / Keller, Peter (author) / Mavrocordatos, Denis (author) / Wehrli, Bernhard (author) / Johnson, C.Annette (author)
Cement and Concrete Research ; 34 ; 341-348
2003-08-14
8 pages
Article (Journal)
Electronic Resource
English
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