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Practical formulation of shrinkage and creep of concrete

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Abstract

A set of algebraic formulas is proposed to describe the shrinkage and creep of concrete over the entire range of time durations of interest. The formulas cover: the effects of drying at various environmental relatire humidities, the size and shape of cross section, aging (due to hydration), the effect of time lag of loading after the start of drying, creep of specimens predried to various humidities, the nonlinear dependence of stress, the increase of nonlinearity at simultaneous drying, and the decrease of strength for long-time loads. Simplification in the form of a linear dependence on stress is obtained as special case. The formulation is an extension of the double power creep law, which has been recently proposed for creep in absence of moisture exchange. The shape of the time curves of creep depends on the humidity. A rather close agreement with the extensive experimental data available in the literature is demonstrated.

Résumé

On propose une série de formules algébriques qui traduisent le retrait et le fluage du béton considéré pour toutes les durées intéressantes. Ces formules prennent en compte: les effets du séchage à diverses humidités relatives ambiantes, dimensions et formes de la section, le vieillissement (dû à l’hydratation), l’effet retardé du chargement après le début du séchage, le fluage d’éprouvettes préséchées à diverses humidités, la fonction non linéaire de contrainte, l’accroissement de la non-linéarité durant le séchage, et la diminution de la résistance sous charge de longue durée. On a obtenu comme un cas particulier une simplification sous forme de fonction linéaire de la contrainte. La formulation est une extension de la loi de fluage dite «à double puissance» qui a été récemment proposée pour l’étude du fluage en l’absence d’échange d’humidité. La forme des courbes de fluage en fonction du temps dépend des conditions d’humidité. On montre qu’on obtient une assez bonne concordance avec les nombreuses données expérimentales disponibles.

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Authors and Affiliations

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

    Z. P. Bažant (Professor of Civil Engineering), E. Osman (Active Member RILEM) & W. Thonguthai (Graduate Research Assistant)

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  1. Z. P. Bažant
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  2. E. Osman
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  3. W. Thonguthai
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Bažant, Z.P., Osman, E. & Thonguthai, W. Practical formulation of shrinkage and creep of concrete. Matériaux et Constructions 9, 395–406 (1976). https://doi.org/10.1007/BF02473774

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