Authors:
K. Kolovos National Technical University of Athens Chemical Engineering Department, Labs of Inorganic and Analytical Chemistry 9 Heroon Polytechniou St., 015773 Athens Greece Polytechniou St., 015773 Athens Greece

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S. Tsivilis National Technical University of Athens Chemical Engineering Department, Labs of Inorganic and Analytical Chemistry 9 Heroon Polytechniou St., 015773 Athens Greece Polytechniou St., 015773 Athens Greece

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G. Kakali National Technical University of Athens Chemical Engineering Department, Labs of Inorganic and Analytical Chemistry 9 Heroon Polytechniou St., 015773 Athens Greece Polytechniou St., 015773 Athens Greece

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Abstract  

The sintering and the structure of clinkers, modified by the introduction of different ionic forms of sulfur and phosphorus into the raw mix, were examined. One reference synthetic mixture and 25 modified mixtures were prepared by mixing the reference sample with 0.5, 1.0, 1.5, 2.0 and 2.5%w/w of chemical grade CaSO4, CaS, Ca3(PO4)2, CaHPO4 and Ca(H2PO4)2. Free lime content in all samples was measured. The sintering reactions in samples were recorded by means of differential thermal analysis. The texture of the clinkers was examined using a scanning electron microscope and EDX. It is concluded that, despite of their relatively low doping concentration in the raw mix, P and S affect considerably its reactivity and the texture of the clinker. The various ionic forms of the same element (SO42-, S2- for S, PO43-, HPO42- and H2PO4- for P) exhibit a different and unequivocal effect on the reactivity of the synthetic raw mix and on the texture of the corresponding clinkers. S (in both forms) and P (added as HPO42-) are mainly dissolved in the melt and they have a positive effect on the burnability of the raw mix. P (added as PO43- or H2PO4-) is preferentially accumulated in belite. In this case further stabilization of β-C2S occurs and the binding of the free lime is hindered.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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