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Hydraulic and leaching behaviour of belite cements produced with electric arc furnace steel slag as raw material
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).
Hydraulic and leaching behaviour of belite cements produced with electric arc furnace steel slag as raw material
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).
Hydraulic and leaching behaviour of belite cements produced with electric arc furnace steel slag as raw material
Iacobescu, R.I. (author) / Koumpouri, D. (author) / Pontikes, Y. (author) / Angelopoulos, G.N. (author)
Ceramics Silikaty, Prag ; 57 ; 126-132
2013
7 Seiten, 5 Bilder, 3 Tabellen, 34 Quellen
Article (Journal)
English
Rohstoff , Hydratation , Chrom , Mikrostruktur , Belit , Calciumsilicat , Lichtbogenofen , Schlacke , Schlackenzement , Auslaugung , Auslaugen (Mineralogie) , hydraulisches Abbinden , FTIR-Spektroskopie , thermogravimetrische Analyse , Rasterelektronenmikroskopie , CSH (Calciumsilicathydrat) , Trinkwasserverordnung , Vanadium , CO2-Emission , Alit , Wasserlöslichkeit , krebserzeugender Stoff , Oxidationsgrad
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