A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Visual examination of mortars containing flue gas desulphurisation waste subjected to magnesium sulphate solution
This work forms part of a wide ranging research project on the use of waste from the FGD (flue gas desulphurisation) processes in concrete. It examines the resistance to magnesium sulphate, using visual examination, of mortars containing SDW (simulated desulphurised waste). The mortar consists of 1 part binder to 3 parts sand and the water to binder ratio was 0.55. The binder consists of cement, SDW and slag. The cement was partially replaced (by mass) with 0% to 70% SDW and 0% to 90% slag. Mortar specimens were exposed to 2.44% magnesium sulphate (MgSO4) solutions for up to 450 days. Visual examination of mortar specimens suggest that replacing cement with increasing levels of SDW improved sulphate resistance in each sulphate solution. This was attributed to the dilution of (3CaO)(Al2O3) and CaOH2 due to the reduction in cement, pore refinement, and the formation of ettringite during early periods of hydration. Mortars underwent some deterioration due to the reaction with the CaO-SiO2-H2O, CaO-SiO2 and aluminate phases. At SDW contents above 20%, resistance to magnesium sulphate, based on visual examination of specimens, was satisfactory. The use of slag increased the sulphate resistance of mortar.
Visual examination of mortars containing flue gas desulphurisation waste subjected to magnesium sulphate solution
This work forms part of a wide ranging research project on the use of waste from the FGD (flue gas desulphurisation) processes in concrete. It examines the resistance to magnesium sulphate, using visual examination, of mortars containing SDW (simulated desulphurised waste). The mortar consists of 1 part binder to 3 parts sand and the water to binder ratio was 0.55. The binder consists of cement, SDW and slag. The cement was partially replaced (by mass) with 0% to 70% SDW and 0% to 90% slag. Mortar specimens were exposed to 2.44% magnesium sulphate (MgSO4) solutions for up to 450 days. Visual examination of mortar specimens suggest that replacing cement with increasing levels of SDW improved sulphate resistance in each sulphate solution. This was attributed to the dilution of (3CaO)(Al2O3) and CaOH2 due to the reduction in cement, pore refinement, and the formation of ettringite during early periods of hydration. Mortars underwent some deterioration due to the reaction with the CaO-SiO2-H2O, CaO-SiO2 and aluminate phases. At SDW contents above 20%, resistance to magnesium sulphate, based on visual examination of specimens, was satisfactory. The use of slag increased the sulphate resistance of mortar.
Visual examination of mortars containing flue gas desulphurisation waste subjected to magnesium sulphate solution
Visuelle Begutachtung von Mörteln unter Verwertung von Abfällen aus Rauchgasentschwefelungsanlagen nach der Exposition einer Magnesiumsulfatlösung
Khatib, J.M. (author) / Wright, L. (author) / Mangat, P.S. (author)
2009
6 Seiten, 4 Bilder, 2 Tabellen, 16 Quellen
Conference paper
English
Rauchgasentschwefelung , Beton , Magnesiumsulfat , Sulfatbeständigkeit , Tricalciumaluminat , Calciumaluminatsulfathydrat , Wasserabbinden von Zement , Wasser-Zement-Wert , Erhärten (Zementabbinden) , Calciumsilicathydrat , chemische Beständigkeit , Flugaschenzement , Schlackenzement , Mörtel , Betonkorrosion
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