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Practical prediction of time-dependent deformations of concrete

Part I: Shrinkage

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Abstract

Proposed is a practical model for predicting creep and shrinkage of concrete from the composition of concrete mix, strength, age at loading, conditions of environment, size and shape, etc. The main features are: double power law for basic creep, square-root hyperbolic law for shrinkage, diffusion-type size dependence of humidity effects, additive drying creep term related to shrinkage, and activation energy treatment of thermal effects. Optimization techniques are used to fit numerous test data available in the literature. The work is a continuation of previous investigations and consists of several parts. This first part deals with shrinkage.

Résumé

On propose un modèle de prévision pratique du fluage et du retrait du béton à partir de la composition du mélange, de la résistance, de l'âge au chargement, des conditions d'ambiance, des dimensions et formes, etc. Les principales caractéristiques sont: la loi de double puissance pour le fluage de base, la loi hyperbolique quadratique pour le retrait, l'effet d'échelle du type «diffusion de l'humidité», un terme ajouté de fluage de séchage lié au retrait et la prise en compte des effets thermiques par l'énergie d'activation. On s'est servi des techniques d'optimisation afin de faire concorder les nombreux résultats d'essai publiés. Ce travail est la continuation d'études antérieures et se divise en plusieurs parties. La première partie traite du retrait.

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Author notes

  1. L. Panula (Graduate Research Assistant, Eng., Tippets, Abbett McCarthy and Shatton)

    Present address: Tippets, Abbett McCarthy and Shatton, New York

Authors and Affiliations

  1. Northwestern University, 60201, Evanston, Illinois, USA

    Z. P. Bažant (Professor of Civil Engineering, Active Member, RILEM)

  2. Northwestern University, 60201, Evanston, Illinois, USA

    L. Panula (Graduate Research Assistant, Eng., Tippets, Abbett McCarthy and Shatton)

Authors
  1. Z. P. Bažant
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  2. L. Panula
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Additional information

The work presented in this series of papers has been sponsored under National Science Foundation Grant ENG 75-14848. The second author also received a Fellowship of the Alumnae of Northwestern University and Walter P. Murphy Fellowship from The Technological Institute of Northwestern University.

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Bažant, Z.P., Panula, L. Practical prediction of time-dependent deformations of concrete. Matériaux et Constructions 11, 307–316 (1978). https://doi.org/10.1007/BF02473872

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