Mechanical and chemical behavior of calcium sulfoaluminate cements obtained from industrial waste
Abstract
Mechanical and chemical behavior of calcium sulfoaluminate cements obtained from industrial waste
ABSTRACT
A calcium sulfoaluminate clinker was synthesized calcining a mixture of fly ash, fluorogypsum, aluminum slag, and calcium carbonate at 1250 ºC. The clinker was mixed with 15, 20, or 25% e.p. of CaSO4·½H2O. The pastes were prepared with a water/cement ratio of 0.5. Compression resistance of cements cured in potable water and corrosive mediums at 40 ºC was evaluated. The cements cured in potable water developed compressive strengths of 38-39 MPa; those immersed in corrosive mediums showed a decrease in this property after the chemical attack. Ettringite was the main product of hydration. The degradation of the cements by chemical attack was due to a decalcification and dealumination of the pastes.
Keywords:Â calcium sulfoaluminate; ettringite; compressive strength; chemical attack.
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Comportamiento mecánico y quÃmico de cementos de sulfoaluminato de calcio obtenido a partir de desechos industriales
RESUMEN
Se sintetizó un clÃnker de sulfoaluminato de calcio calcinando una mezcla de ceniza volante, fluoryeso, escoria de aluminio y carbonato de calcio a 1250 °C. El clinker fue mezclado con 15, 20 o 25 % e.p. de CaSO4·½H2O. Las pastas se prepararon con relaciones agua/cemento de 0.5. Se evaluó la resistencia a la compresión de cementos curados en agua potable y en medios corrosivos a 40 °C. Los cementos curados en agua potable desarrollaron resistencias a la compresión de 38-39 MPa, los inmersos en medios corrosivos presentaron una disminución en esta propiedad después del ataque quÃmico. La etringita fue el principal producto de hidratación. La degradación de los cementos por ataque quÃmico es debida a una descalcificación y dealuminación de las pastas.
Palabras clave: sulfoaluminato de calcio; etringita; resistencia a la compresión; ataque quÃmico
Comportamento quÃmico e mecânico de cimentos de sulfoaluminato de cálcio obtidos a partir de resÃduos industriais
RESUMO
Foi produzido um clÃnquer de sulfoaluminato de cálcio a partir da calcinação a 1250oC de uma mistura de cinza volante, escória de alumÃnio, carbonato de cálcio e gesso de flúor. Esse clÃnquer foi misturado com 15%, 20% e 25% e.p. de CaSO4·½H2O. As pastas foram preparadas com relação água/cimento igual a 0,5. Foi avaliada a resistência à compressão das pastas curadas em água potável e em meios corrosivos a 40oC. As pastas curadas em água alcançaram resistências à compressão de 38-39 MPa, enquanto as pastas imersas em meios corrosivos apresentaram uma redução da resistência frente ao ataque quÃmico. A etringita foi o principal produto da hidratação desses cimentos. A degradação dessas pastas de cimento por ataque quÃmico ocorreu devido a uma descalcificação e dealuminização dos produtos hidratados.
Palabras-clave: sulfoaluminato de cálcio; etringita; resistência à compressão; ataque quÃmico.
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