Abstract
The characterization of leaching effects on portland cement doped with lead and zinc has been carried out by X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS). Evidence is presented from XPS and SEM/EDS results that the dopant metal ions are preferentially adsorbed on the surface of the cementitious materials. Leaching tests reveal that most of the Zn 2+ ions and some of the Pb 2+ ions are dissolved. A chemical shift with respect to the Si( 2p) XPS peak occurs due to the increased polymerization of the silicates present in cement. The distribution of the cations before and after leaching is discussed in relation to the XPS and SEM/EDS results.
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