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Title:	Geochemical modeling of leaching of Ca, Mg, Al, and Pb from cementitious waste forms
Author(s):	Martens, Evelien Jacques, Diederik Van Gerven, T. Wang, Lian Mallants, Dirk
Keywords:	thermodynamic modelling lead ordinary portland cement waste management
Issue Date:	Aug-2010
Publication type:	Journal article
Citation:	Martens E., Jacques D., Van Gerven T., Wang L., Mallants D.- Geochemical modeling of leaching of Ca, Mg, Al, and Pb from cementitious waste forms.- In: Cement and Concrete Research, 40:8(2010), p. 1298-1305.- ISSN 0008-8846
Abstract:	Results from extraction tests on cement–waste samples were simulated with a thermodynamic equilibrium model using a consistent database, to which lead data were added. Subsequent diffusion tests were modeled by means of a 3D diffusive transport model combined with the geochemical model derived from the extraction tests. Modeling results of the leached major element concentrations for both uncarbonated and (partially) carbonated samples agreed well with the extraction test using the set of pure minerals and solid solutions present in the database. The observed decrease in Ca leaching with increasing carbonation level was qualitatively predicted. Simulations also revealed that Pb leaching is not controlled by dissolution/precipitation only. The addition of the calcite–cerrusite solid solution and adsorption reactions on amorphous Fe- and Al-oxides improved the predictions and are considered to control the Pb leaching during the extractions tests. The dynamic diffusive leaching tests were appropriately modeled for Na, K, Ca and Pb.
Persistent URL:	http://hdl.handle.net/10038/7210
DOI:	doi: 10.1016/j.cemconres.2010.01.007

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