Phase composition gradient in leached polluted cement monoliths
- Department of Materials Engineering and Industrial Technologies, University of Trento, Via Mesiano 77, 38050 Trento (Italy)
- Department of Industrial Engineering, University of Bergamo, INSTM R.U.-Unibg, viale Marconi 5, 24044 Dalmine (Italy)
- Department of Chemistry, Materials and Chemical Engineering 'G. Natta', INSTM R.U.-Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milan (Italy)
- Department of Earth Science 'Ardito Desio', University of Milano, via Mangiagalli 34, 20133 Milan (Italy)
The long-term behaviour of cement monoliths containing an organic waste, was investigated by means of a 14-month dynamic-leach-testing in deionised water. The degree of hydration and the phase composition were measured by Thermal Analysis (TGA/DTA), X-ray Powder Diffraction (XRD) and Energy Dispersive X-ray Spectroscopy (EDXS). X-ray data, analysed by the Rietveld method, provided a detailed quantitative information on the in-depth crystalline phase distribution in the specimens. Crossed with TGA and spectroscopic data and supported by the results of kinetic/hydration calculations, the diffraction results provide a detailed description of the in-depth phase composition gradient in the leached monoliths. In particular, 14-month old specimens show a clear leaching zone with predominance of CSH and calcite near the surface and low abundance of the other usual cement constituents. The material is not completely effective in retaining the contaminant.
- OSTI ID:
- 21033048
- Journal Information:
- Cement and Concrete Research, Vol. 37, Issue 11; Other Information: DOI: 10.1016/j.cemconres.2007.08.013; PII: S0008-8846(07)00174-3; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0008-8846
- Country of Publication:
- United States
- Language:
- English
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