Kritische Betrachtung von Temperaturkriterien zur Kontrolle der erhärtungsbedingten Rissgefahr

Translated title of the contribution: Critical review of temperature criteria for controlling cracking due to concrete hardening

Dirk Schlicke*, Christina Krenn

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Critical review of temperature criteria for controlling cracking due to concrete hardening. Various limits for the concrete temperature are specified for the production of concrete on site. These are primarily to ensure the workability of the fresh concrete in extreme weather conditions and to ensure proper hydration. There are also additional concrete temperature requirements for certain applications to reduce the risk of cracking or crack intensity due to hardening-induced restraint stresses. In this context, the maximum member temperature, the maximum fresh concrete temperature or the maximum temperature gradient across the cross-section are generally limited. However, these limits are defined independently of the ambient temperature. The extent to which these temperature limits are justified in terms of the risk of cracking due to concrete hardening is investigated using thermo-mechanical simulations on 3D volume models. In detail, the temperature and stress evolution due to concrete hardening is simulated for different member types and ambient boundary conditions and evaluated with respect to the associated risk of cracking. The systematic evaluation of the results shows that the general limits of maximum member temperature and fresh concrete temperature are only pragmatic solutions for controlling the risk of cracking due to concrete hardening. These limits should always be considered with regard to the ambient temperature.

Translated title of the contributionCritical review of temperature criteria for controlling cracking due to concrete hardening
Original languageGerman
Pages (from-to)559-571
Number of pages13
JournalBeton- und Stahlbetonbau
Volume119
Issue number8
DOIs
Publication statusPublished - Aug 2024

ASJC Scopus subject areas

  • Building and Construction

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