Chitosan-cement matrices for solidification-stabilization of heavy metals
Keywords: 
Chitosan
Solidification
Stabilization
Heavy metals
Cement
Issue Date: 
13-Sep-2010
Publisher: 
University of Birmingham
ISBN: 
9780704427976
Citation: 
L.M. Grover, M.P. Hofmann, H. Rossetto, A.M. Smith, editor. Extended abstracts of the 30th Cement and Concrete Science Conference. Chitosan-cement matrices for solidification-stabilization of heavy metals; Birmingham: University of Birmingham, 2010.
Abstract
Cement matrices have been extensively used to solidify-stabilize hazardous wastes containing heavy metals [1]. However, the presence of some heavy metals such as Pb and Zn modify the rheological properties of the cement due to the interaction with different cement phases [2], [3]. These changes in fresh-state properties of the cement materials may have a negative influence on the applicability of these matrices. Moreover, the hardened-state properties could be affected by the fresh-state changes and, consequently, the long-term stability and leaching of the heavy metals would be jeopardized. The use of some polymeric additives may be interesting in order to solve the aforementioned problems. Polysaccharides have been reported to be efficient cement additives behaving as viscosity-enhancing admixtures and set retarders [4].

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