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Title: Mineralogical phase analysis of alkali and sulfate bearing belite rich laboratory clinkers

Abstract

The activation of laboratory belite clinkers has been carried out by adding variable amounts of alkaline salts (K{sub 2}CO{sub 3}, Na{sub 2}CO{sub 3}), and/or SO{sub 3} as gypsum in the raw materials but keeping almost constant the main elements ratios, Ca/Si/Al/Fe. Quantitative phase analyses by the Rietveld method using high resolution synchrotron and strictly monochromatic CuK{alpha}{sub 1} laboratory X-ray powder diffraction data has been performed. Quantitative phase analysis results have been compared to validate the protocol using laboratory X-ray data. The agreement in the results is noteworthy, which indicates that good quantitative phase analyses can be obtained from laboratory X-ray powder data. Qualitative studies have confirmed that the addition of alkaline salts to raw mixtures promotes the stabilization, at room temperature, of the highest temperature polymorphs: {alpha}'{sub H}-C{sub 2}S and {alpha}-C{sub 2}S. Quantitative studies gave the phase assemblage for ten different laboratory belite clinkers. As an example, an active belite clinker with 1.0 wt.% of K{sub 2}O and 1.0 wt.% of Na{sub 2}O (amounts added to the raw mixtures) contains 8.5(3) wt.% of {beta}-C{sub 2}S, 21.2(3) wt.% of {alpha}'{sub H}-C{sub 2}S, 24.1(2) wt.% of {alpha}-C{sub 2}S, 18.9(3) wt.% of total C{sub 3}S, 17.3(2) wt.% of C{sub 3}A and 10.0(2) wt.%more » of C{sub 4}AF. A belite clinker with 0.8 wt.% SO{sub 3} (nominal loading) contains 60.7(1) wt.% of {beta}-C{sub 2}S, 6.7(2) wt.% of {alpha}'{sub H}-C{sub 2}S, 12.3(7) wt.% of C{sub 3}S, 9.1(2) wt.% of C{sub 3}A and 11.2(2) wt.% of C{sub 4}AF. Overall, quantitative phase analyses have shown that alkaline oxides stabilize {alpha}'{sub H}-C{sub 2}S and {alpha}-C{sub 2}S, sulfur stabilizes {beta}-C{sub 2}S, with a large unit cell volume, and the joint presence of alkaline oxides and sulfur promotes mainly the stabilization of the {alpha}'{sub H}-C{sub 2}S polymorph.« less

Authors:
 [1];  [2];  [1];  [3];  [4]
  1. Departamento de Quimica Inorganica, Cristalografia y Mineralogia, Universidad de Malaga, 29071 Malaga (Spain)
  2. (Morocco)
  3. L.P.C.M. Departement de Chimie, Faculte des Sciences, Universite Chouaib Doukkali, El Jadida 24000 (Morocco)
  4. Departamento de Quimica Inorganica, Cristalografia y Mineralogia, Universidad de Malaga, 29071 Malaga (Spain). E-mail: g_aranda@uma.es
Publication Date:
OSTI Identifier:
20995380
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 37; Journal Issue: 5; Other Information: DOI: 10.1016/j.cemconres.2007.01.012; PII: S0008-8846(07)00023-3; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CEMENTS; GYPSUM; MONOCHROMATIC RADIATION; PHASE STUDIES; POTASSIUM OXIDES; SODIUM CARBONATES; SODIUM OXIDES; STABILIZATION; SULFATES; SULFITES; TEMPERATURE RANGE 0273-0400 K; X RADIATION; X-RAY DIFFRACTION

Citation Formats

Morsli, Khadija, L.P.C.M. Departement de Chimie, Faculte des Sciences, Universite Chouaib Doukkali, El Jadida 24000, Torre, Angeles G. de la, Zahir, Mohammed, and Aranda, Miguel A.G. Mineralogical phase analysis of alkali and sulfate bearing belite rich laboratory clinkers. United States: N. p., 2007. Web. doi:10.1016/j.cemconres.2007.01.012.
Morsli, Khadija, L.P.C.M. Departement de Chimie, Faculte des Sciences, Universite Chouaib Doukkali, El Jadida 24000, Torre, Angeles G. de la, Zahir, Mohammed, & Aranda, Miguel A.G. Mineralogical phase analysis of alkali and sulfate bearing belite rich laboratory clinkers. United States. doi:10.1016/j.cemconres.2007.01.012.
Morsli, Khadija, L.P.C.M. Departement de Chimie, Faculte des Sciences, Universite Chouaib Doukkali, El Jadida 24000, Torre, Angeles G. de la, Zahir, Mohammed, and Aranda, Miguel A.G. Tue . "Mineralogical phase analysis of alkali and sulfate bearing belite rich laboratory clinkers". United States. doi:10.1016/j.cemconres.2007.01.012.
@article{osti_20995380,
title = {Mineralogical phase analysis of alkali and sulfate bearing belite rich laboratory clinkers},
author = {Morsli, Khadija and L.P.C.M. Departement de Chimie, Faculte des Sciences, Universite Chouaib Doukkali, El Jadida 24000 and Torre, Angeles G. de la and Zahir, Mohammed and Aranda, Miguel A.G.},
abstractNote = {The activation of laboratory belite clinkers has been carried out by adding variable amounts of alkaline salts (K{sub 2}CO{sub 3}, Na{sub 2}CO{sub 3}), and/or SO{sub 3} as gypsum in the raw materials but keeping almost constant the main elements ratios, Ca/Si/Al/Fe. Quantitative phase analyses by the Rietveld method using high resolution synchrotron and strictly monochromatic CuK{alpha}{sub 1} laboratory X-ray powder diffraction data has been performed. Quantitative phase analysis results have been compared to validate the protocol using laboratory X-ray data. The agreement in the results is noteworthy, which indicates that good quantitative phase analyses can be obtained from laboratory X-ray powder data. Qualitative studies have confirmed that the addition of alkaline salts to raw mixtures promotes the stabilization, at room temperature, of the highest temperature polymorphs: {alpha}'{sub H}-C{sub 2}S and {alpha}-C{sub 2}S. Quantitative studies gave the phase assemblage for ten different laboratory belite clinkers. As an example, an active belite clinker with 1.0 wt.% of K{sub 2}O and 1.0 wt.% of Na{sub 2}O (amounts added to the raw mixtures) contains 8.5(3) wt.% of {beta}-C{sub 2}S, 21.2(3) wt.% of {alpha}'{sub H}-C{sub 2}S, 24.1(2) wt.% of {alpha}-C{sub 2}S, 18.9(3) wt.% of total C{sub 3}S, 17.3(2) wt.% of C{sub 3}A and 10.0(2) wt.% of C{sub 4}AF. A belite clinker with 0.8 wt.% SO{sub 3} (nominal loading) contains 60.7(1) wt.% of {beta}-C{sub 2}S, 6.7(2) wt.% of {alpha}'{sub H}-C{sub 2}S, 12.3(7) wt.% of C{sub 3}S, 9.1(2) wt.% of C{sub 3}A and 11.2(2) wt.% of C{sub 4}AF. Overall, quantitative phase analyses have shown that alkaline oxides stabilize {alpha}'{sub H}-C{sub 2}S and {alpha}-C{sub 2}S, sulfur stabilizes {beta}-C{sub 2}S, with a large unit cell volume, and the joint presence of alkaline oxides and sulfur promotes mainly the stabilization of the {alpha}'{sub H}-C{sub 2}S polymorph.},
doi = {10.1016/j.cemconres.2007.01.012},
journal = {Cement and Concrete Research},
number = 5,
volume = 37,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}