A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Effect of various protective, materials on sulfation of concrete
The deterioration of concrete structural components exposed to soils and groundwater contaminated with sulfate salts is a serious problem in durability of concrete. The sulfate ions react with the hydration products of cement, namely C3A and Ca(OH)2, producing expansive and softening types of deterioration. The research of the influence of various solutions containing SO4(2-) (Na2SO4, H2SO4) on the deterioration of the following concrete model samples: 1) containing admixtures (acrylic-based and lignosulfonate-based), 2) protected surface with high alkaline coating has been done. The distribution of SO4(2-) and crystalline phases in all depths of the specimen, mass change, pH and calcium ion content in solution were investigated after the immersion of concrete in solution for a period of 1 month - 6 months under static conditions. It was found that way of sulfate attack depends to a greater extent on kind of solutions (Na2SO4, H2SO4) than on admixtures or coating types. After subjecting concrete samples to action of sulphuric acid in all depths of specimen gypsum was detected which can lead to further deleterious reaction in cement matrix forming ettringite or thaumasite. In sulfuric acid solution was determined high content of calcium ions. Invariability of pH was achieved after 240 hours. The results obtained show that the complex protection comprising combine acrylic-based admixtures and high alkaline coating provides the best protection of concrete against sulfate attack.
Effect of various protective, materials on sulfation of concrete
The deterioration of concrete structural components exposed to soils and groundwater contaminated with sulfate salts is a serious problem in durability of concrete. The sulfate ions react with the hydration products of cement, namely C3A and Ca(OH)2, producing expansive and softening types of deterioration. The research of the influence of various solutions containing SO4(2-) (Na2SO4, H2SO4) on the deterioration of the following concrete model samples: 1) containing admixtures (acrylic-based and lignosulfonate-based), 2) protected surface with high alkaline coating has been done. The distribution of SO4(2-) and crystalline phases in all depths of the specimen, mass change, pH and calcium ion content in solution were investigated after the immersion of concrete in solution for a period of 1 month - 6 months under static conditions. It was found that way of sulfate attack depends to a greater extent on kind of solutions (Na2SO4, H2SO4) than on admixtures or coating types. After subjecting concrete samples to action of sulphuric acid in all depths of specimen gypsum was detected which can lead to further deleterious reaction in cement matrix forming ettringite or thaumasite. In sulfuric acid solution was determined high content of calcium ions. Invariability of pH was achieved after 240 hours. The results obtained show that the complex protection comprising combine acrylic-based admixtures and high alkaline coating provides the best protection of concrete against sulfate attack.
Effect of various protective, materials on sulfation of concrete
Setina, J. (author) / Vitina, I. (author) / Lagzdina, S. (author) / Igaune, S. (author)
2003
10 Seiten, 6 Bilder, 3 Tabellen, 11 Quellen
Conference paper
English
Beton , Sulfatbeständigkeit , Säurebeständigkeit , Oberflächenschaden , Schaden , Schutzüberzug , Korrosionsschutzschicht , Hydratisieren , wässrige Lösung , Calciumhydroxid , Gips , Acrylharz , Lignosulfonat , Phasenzusammensetzung , Gewichtsverlust , pH-Einfluss , Einflussgröße , Immission , Schwefelsäure , Ettringit , Thaumasit
Effect of various protective materials on sulfation of concrete
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