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Materials and Structures

, Volume 34, Issue 5, pp 293–301 | Cite as

Numerical modelling of volume changes at early ages-Potential, pitfalls and challenges

  • K. van Breugel
Scientific Papers

Abstract

For quantification of early deformations of hardening cement-based systems a number of conceptual and numerical models have been proposed. In this contribution some aspects of these models with be discussed and evaluated with respect to the mechanisms that are considered to be responsible for volume and length changes at early ages. Emphasis will be on systems hydrating under sealed conditions. The fact that volume changes at early ages, and more in particular autogenous shrinkage, should be considered as the response of a continuously changing system is discussed. These changes concern at least the pore system and the state of moisture in the pore system. Numerical models should, therefore, be able to simulate the evolution of the pore system with progress of the hydration process explicitly. Parallel with the modelling of the evolution of the pore system, c.q. the microstructure, the state of stress and associated deformations should be considered. The potential of numerical simulation models to deal with this coupled problem is discussed. Pitfalls encountered when developing and validating numerical simulation models will be addressed and discussed. The potential of numerical models is illustrated with examples.

Keywords

Length Change Ettringite Cement Paste Hydration Product Pore System 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Résumé

Un grand nombre de modèles conceptuels et numériques ont été proposés pour la quantification des déformations précoces relatives au durcissement de systèmes à base cimentaire. Dans cette contribution quelques aspects de ces modèles seront abordés et évalués au regard des mécanismes que l'on considère comme responsables des changements de volume et de dimension aux jeunes âges. L'accent sera mis sur les systèmes en cours d'hydratation dans des conditions étanches. L'article examine le fait que les changements de volume aux jeunes âges, et plus particulièrement dans le retrait endogène, devraient être considérés comme la réponse des systèmes changeant constamment. Ces changements concernent au moins le système des pores et l'état d'humidité du système poreux. Les modèles numériques devraient, par conséquent, être en mesure de simuler explicitement l'évolution du système poreux avec la progression de l'hydratation. Un parallèle avec la modélisation de l'évolution du système poreux, à savoir la microstructure, l'état de tension et autres déformations associées, devrait être établi. Le potentiel des modèles de simulation numériques pour traiter de ce problème couplé est présenté. Les problèmes rencontrés en développant et en validant ces modèles de simulation numériques seront exposés et débattus. Plusieurs exemples viennent illustrer le potentiel des modèles numériques.

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Copyright information

© RILEM 2001

Authors and Affiliations

  • K. van Breugel
    • 1
  1. 1.Delft University of TechnologyThe Netherlands

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