Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effect of CMA deicers on concrete properties
The paper presents the results of an investigation of the effects of concentrated calcium-magnesium acetate (CMA) solutions on concrete. Concrete specimens were manufactured following guidelines for structures exposed to freeze-thaw cycles and deicers (water-cement ratio, w/c = 0.45 and air-entraining admixture) employing two cements obtained by blending a Portland clinker with 20% of ground limestone, or 40% blast furnace slag. Following 28 days of curing, the specimens were immersed for 8 months at 20 degree C in two concentrated (25%) CMA solutions prepared using (a) a commercial CMA-based deicing chemical or (b) pure calcium and magnesium acetates blended to obtain the same Ca/Mg molar ratio (0.43) as the deicer. Continuous exposure to both CMA solutions led to a significant decrease in load capacity, mass loss and marked visual deterioration. The aggression was particularly strong in the case of the deicer solution, and was mitigated by the use of the slag cement.
Effect of CMA deicers on concrete properties
The paper presents the results of an investigation of the effects of concentrated calcium-magnesium acetate (CMA) solutions on concrete. Concrete specimens were manufactured following guidelines for structures exposed to freeze-thaw cycles and deicers (water-cement ratio, w/c = 0.45 and air-entraining admixture) employing two cements obtained by blending a Portland clinker with 20% of ground limestone, or 40% blast furnace slag. Following 28 days of curing, the specimens were immersed for 8 months at 20 degree C in two concentrated (25%) CMA solutions prepared using (a) a commercial CMA-based deicing chemical or (b) pure calcium and magnesium acetates blended to obtain the same Ca/Mg molar ratio (0.43) as the deicer. Continuous exposure to both CMA solutions led to a significant decrease in load capacity, mass loss and marked visual deterioration. The aggression was particularly strong in the case of the deicer solution, and was mitigated by the use of the slag cement.
Effect of CMA deicers on concrete properties
Santagata, M.C. (Autor:in) / Collepardi, M. (Autor:in)
Cement and Concrete Research ; 30 ; 1389-1394
2000
6 Seiten, 8 Quellen
Aufsatz (Zeitschrift)
Englisch
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