Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
581431 | Journal of Hazardous Materials | 2009 | 6 Pages |
Abstract
In this paper the mechanical properties of magnesium potassium phosphate cements used for the Stabilization/Solidification (S/S) of galvanic wastes were investigated. Surrogate wastes (metal nitrate dissolutions) were employed containing Cd, Cr(III), Cu, Ni, Pb or Zn at a concentration of 25 g dmâ3 and different water-to-solid (W/S) ratios (0.3, 0.4, 0.5 and 0.6 dm3 kgâ1) have been employed. Cements were prepared by mixing hard burned magnesia of about 70% purity with potassium dihydrogen phosphate. Compressive strength and tensile strength of specimens were determined. In addition the volume of permeable voids was measured. It was found that when comparing pastes that the volume of permeable voids increases and mechanical strength decreases with the increase of water-to-solid ratio (W/S). Nevertheless pastes with the same material proportions containing different metals show different mechanical strength values. The hydration products were analyzed by XRD. With the increase of water content not previously reported hydration compound was detected: bobierrite.
Related Topics
Physical Sciences and Engineering
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Authors
Irene Buj, Josep Torras, Daniel Casellas, Miquel Rovira, Joan de Pablo,