Determining cement composition by Fourier transform infrared spectroscopy |
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| Affiliation: | 1. Schlumberger Cambridge Research, Cambridge, United Kingdom;2. Schlumberger Dowell Europe-Africa Technology Centre, Aberdeen, United Kingdom;1. Institute of Inorganic Chemistry of Slovak Academy of Sciences, Dúbravská cesta 9, 845 36 Bratislava, Slovakia;2. Department of Physical Chemistry, Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia;3. Institute for Soil Science, University of Natural Resources and Life Sciences, Peter-Jordanstrasse 82, A-1190 Wien, Austria;1. Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Università di Catania, Corso Italia, 57, Catania, 95127 Sicily, Italy;2. Dipartimento di Ingegneria “Enzo Ferrari”, Università di Modena e Reggio Emilia, Via Pietro Vivarelli 10, 41125 Modena, Italy;3. IRCER (Institut de Recherche sur les Céramiques), University of Limoges, 12, Rue Atlantis, 87100 Limoges, France;1. Department of Building Physics and Building Materials, Lodz University of Technology, Al. Politechniki 6, 90-924 Łódź, Poland;2. Skanska S.A., Research and Innovation Center, Ul. Pomorska 106, 91-402 Łódź, Poland |
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| Abstract: | A diffuse reflectance mid-infrared Fourier transform spectroscopy (DRIFTS) method is described for obtaining high quality Fourier transform infrared (FTIR) spectra of cements. DRIFT spectra of synthetic C3S, C2S, C3A, and C4AF and of pure gypsum, bassanite, anhydrite, syngenite, and calcite are shown. Typical spectra of American Petroleum Institute class G and class A cements display characteristic features which can be related qualitatively to variations in the constituent minerals. For quantitative analysis, the FTIR spectra of 156 cements of varied origin and known elemental composition have been used to construct multivariate calibration models. These relate the spectrum to composition (expressed in terms of nine mineral components and five minor oxides) and allow the composition of unknown cements to be determined rapidly from the FTIR spectrum alone. Error estimates are given. |
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