Inertization of toxic metals in metakaolin-blended cements
Conference
·
OSTI ID:518688
- URGC-Materiaux, Villeurbanne (France)
Three blended cements containing respectively 10, 20, and 30 % metakaolin (MK) were tested for engineering properties and ability to immobilize chromium, lead, and cadmium. The pollutants (sodium bichromate, lead nitrate, and cadmium chloride) were added to the mixing water of pastes and standard mortars. The strength, microstructure and leaching properties of pastes and mortars were investigated. The results obtained show that a binder containing around 20 to 30 % MK is efficient towards the inertization of toxic metals. Some mechanisms of immobilization are proposed : Cr (VI) is incorporated in calcium aluminates while Cd and Pb are fixed in C-S-H.
- OSTI ID:
- 518688
- Report Number(s):
- CONF-9604124--
- Country of Publication:
- United States
- Language:
- English
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