Praxisorientierte Ermittlung von Ausschalfristen

Abstract

Unter bestimmten Voraussetzungen kann die Ausschalfrist für Betonbauteile vereinfacht praxisnah, z. B. über tabellierte Werte, abgeschätzt werden. Alternativ stehen aufwendigere Verfahren zur Verfügung, welche je nach Bedarf bzw. in Abhängigkeit von der für die Bauaufgabe erforderlichen Genauigkeit herangezogen werden können. Im Folgenden wird die praxisorientierte Ermittlung von Ausschalfristen im Zusammenhang mit dem Eurocode 2 und DIN EN 13670/DIN 1045‐3 diskutiert. Practice‐oriented determination of stripping times Under certain conditions, the stripping times of concrete members can be estimated in a simplified way (e.g. tabulated values are provided for practice). Depending on the required precision more complex methods are available. In the following a practice‐oriented determination of stripping times according to Eurocode 2 and DIN EN 13670/DIN 1045‐3 is discussed.

An optical measurement system for monitoring of concrete curing

“…It takes around 28 days for concrete to reach its nominal strength. Under optimal conditions a large percentage of this value can already be reached within the first 24-72 hours [3] [4].…”

“…This formwork removal point changes depending on the concrete mixture, shape of the product and environmental factors. Currently, the point in time is guessed based on experience or determined with laborious methods [4]. Manufacturers of such concrete products must be certain to avoid early framework removal to ensure their products stability and quality [4].…”

“…Currently, the point in time is guessed based on experience or determined with laborious methods [4]. Manufacturers of such concrete products must be certain to avoid early framework removal to ensure their products stability and quality [4]. However, waiting for extended time periods for the concrete to dry is costly and wastes production capacities.…”