Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Membrane curing of concrete: Moisture loss
From the study carried out, the following conclusions have been drawn: The three-phase-theory, describing the drying process of a solid mass, is not applicable to concrete at early stages. The rate of moisture loss from concrete at early ages was significantly greater than that from a plane water surface. There were two peaks observed in the rate od moisture loss from concrete, and they were found to be associated with the temperature rise during cement hydration. When curing compounds were applied, the moisture loss from concrete was reduced immediately, and the second peak in evaporation, which occured in air-cured specimens, was eliminated. The effectiveness of membrane curing was dependent markedly on the time of its application. There appears to be a threshold range in the amount of initial moisture loss, beyond which the application of membrane curing resulted in significantly reduced effectiveness. This threshold range for the lean mix was found to be around 0.3 to 0.4 l/m2, but for rich mixes (with 400 kg/m3 of cement or more), it was practically zero. This means that, when a rich concrete mix is to be used, the curing compound should be applied as early as practically feasible. The effectiveness of membrane curing depends on the type of curing membranes used when applied at the same rate. The curing compound chlorinated rubber was found to be the most effective one followed by the solvent-based compounds, and the least effective was a water based type.
Membrane curing of concrete: Moisture loss
From the study carried out, the following conclusions have been drawn: The three-phase-theory, describing the drying process of a solid mass, is not applicable to concrete at early stages. The rate of moisture loss from concrete at early ages was significantly greater than that from a plane water surface. There were two peaks observed in the rate od moisture loss from concrete, and they were found to be associated with the temperature rise during cement hydration. When curing compounds were applied, the moisture loss from concrete was reduced immediately, and the second peak in evaporation, which occured in air-cured specimens, was eliminated. The effectiveness of membrane curing was dependent markedly on the time of its application. There appears to be a threshold range in the amount of initial moisture loss, beyond which the application of membrane curing resulted in significantly reduced effectiveness. This threshold range for the lean mix was found to be around 0.3 to 0.4 l/m2, but for rich mixes (with 400 kg/m3 of cement or more), it was practically zero. This means that, when a rich concrete mix is to be used, the curing compound should be applied as early as practically feasible. The effectiveness of membrane curing depends on the type of curing membranes used when applied at the same rate. The curing compound chlorinated rubber was found to be the most effective one followed by the solvent-based compounds, and the least effective was a water based type.
Membrane curing of concrete: Moisture loss
Einfluß einer Membrane auf den Feuchtigkeitsverlust von Beton
Wang, J. (Autor:in) / Dhir, R.K. (Autor:in) / Levitt, M. (Autor:in)
Cement and Concrete Research ; 24 ; 1463-1474
1994
12 Seiten, 7 Bilder, 3 Tabellen, 11 Quellen
Aufsatz (Zeitschrift)
Englisch
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