Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Thaumasite formation due to atmospheric SO2 - hydraulic mortar interaction
The objective of this research was to reproduce the formation of thaumasite due to the reaction of atmospheric SO2 with hydraulic mortars. The research was carried out on mortars made with Ordinary Portland Cement (OPC), Mineralized White Portland Cement, Hydraulic Lime and a mixture of Lime and Pozzolana. Mortars underwent sulfation by exposing the samples to 300 ppm SO2 at 25deg C and 95 % RH for 2 days. Subsequently, half of the sulfated samples were kept for 6 and 12 months in a chamber with 0.3 ppm, SO2 as pollutant (0.50 l min-1 flow gas velocity), 5 deg C and 95 % RH. The other halves of the sulfated samples were kept partially immersed in water at 5 deg C for 4, 9 and 14 months. The process of thaumasite formation in hydraulic mortars due to the interaction of the material with atmospheric SO2 was reproduced in all the hydraulic mortars kept partially immersed in water at low temperature, except in the lime-pozzolana mixture. Gypsum was the first reaction product formed as a result of that interaction. Subsequently, gypsum reacted with calcium carbonate and C-S-H gel resulting in the formation of thaumasite. The formation of thaumasite was quicker in sulfated samples kept at low temperature partially immersed in water. Only in OPC mortars was thaumasite formation observed in samples exposed to 0.3 ppm of SO2 for 12 months.
Thaumasite formation due to atmospheric SO2 - hydraulic mortar interaction
The objective of this research was to reproduce the formation of thaumasite due to the reaction of atmospheric SO2 with hydraulic mortars. The research was carried out on mortars made with Ordinary Portland Cement (OPC), Mineralized White Portland Cement, Hydraulic Lime and a mixture of Lime and Pozzolana. Mortars underwent sulfation by exposing the samples to 300 ppm SO2 at 25deg C and 95 % RH for 2 days. Subsequently, half of the sulfated samples were kept for 6 and 12 months in a chamber with 0.3 ppm, SO2 as pollutant (0.50 l min-1 flow gas velocity), 5 deg C and 95 % RH. The other halves of the sulfated samples were kept partially immersed in water at 5 deg C for 4, 9 and 14 months. The process of thaumasite formation in hydraulic mortars due to the interaction of the material with atmospheric SO2 was reproduced in all the hydraulic mortars kept partially immersed in water at low temperature, except in the lime-pozzolana mixture. Gypsum was the first reaction product formed as a result of that interaction. Subsequently, gypsum reacted with calcium carbonate and C-S-H gel resulting in the formation of thaumasite. The formation of thaumasite was quicker in sulfated samples kept at low temperature partially immersed in water. Only in OPC mortars was thaumasite formation observed in samples exposed to 0.3 ppm of SO2 for 12 months.
Thaumasite formation due to atmospheric SO2 - hydraulic mortar interaction
Thaumasitbildung durch atmosphärisches SO2. Eine hydraulische Mörtel-Wechselwirkung
Blanco-Varela, M.T. (Autor:in) / Aguilera, J. (Autor:in) / Martinez-Ramirez, S. (Autor:in) / Puertas, F. (Autor:in) / Palomo, A. (Autor:in) / Sabbioni, C. (Autor:in) / Zappia, G. (Autor:in) / Riontino, C. (Autor:in) / Balen, K.V. (Autor:in) / Toumbakari, E.E. (Autor:in)
2002
10 Seiten, 9 Bilder, 2 Tabellen, 10 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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