An XPS and SEM/EDS characterization of leaching effects on lead- and zinc-doped portland cement
1992; Elsevier BV; Volume: 30; Issue: 1 Linguagem: Inglês
10.1016/0304-3894(92)87076-r
ISSN1873-3336
AutoresDavid L. Cocke, M. Yousuf A. Mollah, José R. Parga, Thomas R. Hess, J. Dale Ortego,
Tópico(s)Innovative concrete reinforcement materials
ResumoThe 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 Zn2+ ions and some of the Pb2+ 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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