Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Volume change of high-strength concrete in moist conditions
Results of length change over time of high-strength cement paste, mortar, and concrete in moist conditions are reported. The effect of specimen size, water-to-cement ratio and type and size of aggregate on the water absorption and length change were also investigated. Water permeation depth was calculated based on the increase in mass of the specimen and on the theoretical chemical shrinkage. The experimental results indicate that increase in volume occurred in small cement paste specimens in moist conditions while larger specimens decreased in volume during the first two weeks of testing. Because the curing water can only permeate the surface layer of the specimen, the inside of the specimen is subjected to self-desiccation, thus leading to a size effect in the prediction of length change. High-strength concrete samples in moist conditions had a higher decrease in volume than the mortar samples containing the same aggregate volume fraction. This difference is attributed to the higher porosity in the transition zone between the aggregate and cement paste. The self-stress caused by restrained autogenous volume change can be large, and should be taken into account when designing high-strength concrete structures.
Volume change of high-strength concrete in moist conditions
Results of length change over time of high-strength cement paste, mortar, and concrete in moist conditions are reported. The effect of specimen size, water-to-cement ratio and type and size of aggregate on the water absorption and length change were also investigated. Water permeation depth was calculated based on the increase in mass of the specimen and on the theoretical chemical shrinkage. The experimental results indicate that increase in volume occurred in small cement paste specimens in moist conditions while larger specimens decreased in volume during the first two weeks of testing. Because the curing water can only permeate the surface layer of the specimen, the inside of the specimen is subjected to self-desiccation, thus leading to a size effect in the prediction of length change. High-strength concrete samples in moist conditions had a higher decrease in volume than the mortar samples containing the same aggregate volume fraction. This difference is attributed to the higher porosity in the transition zone between the aggregate and cement paste. The self-stress caused by restrained autogenous volume change can be large, and should be taken into account when designing high-strength concrete structures.
Volume change of high-strength concrete in moist conditions
Volumenänderung von hochfestem Beton unter feuchten Bedingungen
Miyazawa, S. (Autor:in) / Monteiro, P.J.M. (Autor:in)
Cement and Concrete Research ; 26 ; 567-572
1996
6 Seiten, 8 Bilder, 4 Tabellen, 9 Quellen
Aufsatz (Zeitschrift)
Englisch
Beton , feuchte Atmosphäre , Feuchtigkeit , Korrosion , Wasser-Zement-Wert , Schrumpfung , Additiv , Absorption , Wasser , Mörtel , Porosität , Volumen , Zementpaste
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