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Impact of carbon dioxide on the immobilization potential of cemented wastes: Chromium
Portland cement and blended cements containing blast furnace slag afford both physical and chemical immobilization of chromium. Chromium occurs in aqueous solutions in two oxidation states, Cr(III) and Cr(VI). Slag-containing cements are very effektive at removing Cr(VI) from the internal pore fluid, probably by reducing Cr(VI) to less soluble Cr(III). Carbon dioxide attack, or carbonation, is probably the most common form of concrete environmental attack and it promotes changes to the cement chemical composition and physical properties that can affect the long-term retention of heavy metals. In the present paper the effect of carbonation on the immobilization of Cr(III) and Cr(VI) has been studied in both Portland cements and blended cements containing blast furnace slag. The results show that although Portland cements matrices are more resistent to carbonation than slag-containing cement matrices, the increase of chromium content in pore solution is more marked for Portland matrices. After 60 days the pore fluid of carbonated Portland cement spiked with 50000 ppm CR(III) or Cr(VI) contains 20 ppm or 40000 ppm respectively, whereas after carbonation of slag blends for the same time, the corresponding pore fluid Cr contents are 1 ppm and 16000 ppm respectively.
Impact of carbon dioxide on the immobilization potential of cemented wastes: Chromium
Portland cement and blended cements containing blast furnace slag afford both physical and chemical immobilization of chromium. Chromium occurs in aqueous solutions in two oxidation states, Cr(III) and Cr(VI). Slag-containing cements are very effektive at removing Cr(VI) from the internal pore fluid, probably by reducing Cr(VI) to less soluble Cr(III). Carbon dioxide attack, or carbonation, is probably the most common form of concrete environmental attack and it promotes changes to the cement chemical composition and physical properties that can affect the long-term retention of heavy metals. In the present paper the effect of carbonation on the immobilization of Cr(III) and Cr(VI) has been studied in both Portland cements and blended cements containing blast furnace slag. The results show that although Portland cements matrices are more resistent to carbonation than slag-containing cement matrices, the increase of chromium content in pore solution is more marked for Portland matrices. After 60 days the pore fluid of carbonated Portland cement spiked with 50000 ppm CR(III) or Cr(VI) contains 20 ppm or 40000 ppm respectively, whereas after carbonation of slag blends for the same time, the corresponding pore fluid Cr contents are 1 ppm and 16000 ppm respectively.
Impact of carbon dioxide on the immobilization potential of cemented wastes: Chromium
Einfluß von Kohlendioxid auf das Chromionenfixierungspotential von Zementen
Macias, A. (author) / Kindness, A. (author) / Glasser, F.P. (author)
Cement and Concrete Research ; 27 ; 215-225
1997
11 Seiten, 6 Bilder, 3 Tabellen, 8 Quellen
Article (Journal)
English
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