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Quantitative X-ray diffraction analysis of chromium(III) doped tricalcium silicate pastes
The hydration products of tricalcium silicate (3CaO)(SiO2) pastes prepared with different concentrations of Cr(III) solutions have been investigated (w/s approx. 0.5). Tricalcium silicate is the main constituent of Portland cement responsible for the strength and stability of hardened Portland cement paste. (Cr(NO3)3)(9H2O) and ((Cr(H2O)4Cl2)Cl)(2H2O), added as dopants to (3CaO)(SiO2), simulate trivalent chromium waste that may be stabilized in ordinary Portland cement. X-ray diffraction was used to monitor the development of the hydration reaction products from the early stages to the late reaction stages. Leaching studies were carried out to evaluate the stability of the Cr(III) containing phases in the hydrated (3CaO)(SiO2) matrix. When added in the trivalent form, chromium has been found to be primarily contained in (3CaO)(SiO2) pastes as calcium chromium hydroxide complexes. The nature of the complex formed depended on the ambient conditions within the reaction chamber. The concentration of the chromium complexes were also found to vary considerably with both age and the chromium concentration in the initial Cr(III)/(3CaO)(SiO2) mixture. Cr(III) was found to be totally stabilized in (3CaO)(SiO2) paste and immobile in the standard acetic acid leaching test.
Quantitative X-ray diffraction analysis of chromium(III) doped tricalcium silicate pastes
The hydration products of tricalcium silicate (3CaO)(SiO2) pastes prepared with different concentrations of Cr(III) solutions have been investigated (w/s approx. 0.5). Tricalcium silicate is the main constituent of Portland cement responsible for the strength and stability of hardened Portland cement paste. (Cr(NO3)3)(9H2O) and ((Cr(H2O)4Cl2)Cl)(2H2O), added as dopants to (3CaO)(SiO2), simulate trivalent chromium waste that may be stabilized in ordinary Portland cement. X-ray diffraction was used to monitor the development of the hydration reaction products from the early stages to the late reaction stages. Leaching studies were carried out to evaluate the stability of the Cr(III) containing phases in the hydrated (3CaO)(SiO2) matrix. When added in the trivalent form, chromium has been found to be primarily contained in (3CaO)(SiO2) pastes as calcium chromium hydroxide complexes. The nature of the complex formed depended on the ambient conditions within the reaction chamber. The concentration of the chromium complexes were also found to vary considerably with both age and the chromium concentration in the initial Cr(III)/(3CaO)(SiO2) mixture. Cr(III) was found to be totally stabilized in (3CaO)(SiO2) paste and immobile in the standard acetic acid leaching test.
Quantitative X-ray diffraction analysis of chromium(III) doped tricalcium silicate pastes
Quantitative röntgendiffraktometrische Analyse von Chrom(III)-dotierten Tricalciumsilicatpasten
Omotoso, O.E. (author) / Ivey, D.G. (author) / Mikula, R. (author)
Cement and Concrete Research ; 26 ; 1369-1379
1996
11 Seiten, 6 Bilder, 4 Tabellen, 14 Quellen
Article (Journal)
English
Quantitative X-Ray Diffraction Analysis of Chromium(III) Doped Tricalcium Silicate Pastes
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