Ceramics-Silikáty 57, (2) 126 - 132 (2013) |
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HYDRAULIC AND LEACHING BEHAVIOUR OF BELITE CEMENTS PRODUCED WITH ELECTRIC ARC FURNACE STEEL SLAG AS RAW MATERIAL
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Iacobescu R. I. 1,2, Koumpouri D. 2, Pontikes Y. 1,
Angelopoulos G. N. 2
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1 Department of Metallurgy and Materials Engineering, KU Leuven,
Kasteelpark Arenberg 44 bus 2450, B-3001 Leuven, Belgium
2 Department of Chemical Engineering, Laboratory of Materials and Metallurgy, University of Patras,
26500 Rio, Greece
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Keywords: Belite cement, Electric arc furnace steel slag, Raw material, Hydration, Leaching
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Three belite-rich cements consisting of a clinker made with 0 (BC), 5 (BC5) and 10 wt. % (BC10) electric arc furnace steel
slag (EAFS) as raw material, were studied for their hydraulic and leaching behaviour. Hydration behaviour was studied by
FTIR, TG/DTG and SEM analyses. The cements with EAFS resulted in a higher C2S/C3S and C4AF/C3A ratio compared to the
reference body. As a result, the rate of hydration was low at early days whereas the structure was porous with scattered AFm
and C–S–H crystals. At 28 days, a comparable dense microstructure consisting largely of C–S–H is observed in all mortars.
Leaching was studied for V and Cr by means of tank test according to standard NEN 7345. The results showed V release
below 2 μg/l. Chromium release calculated per 24 h was 1.4 µg/l in BC5 and 2.4 µg/l in BC10, which is much lower than the
parametric value of 50 µg/l specified by the European Directive for drinking water (98/83/EC). |
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