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Early age creep and stress relaxation of concrete containing blended cements

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Abstract

The main objective is to investigate key properties that influence the stress development in concrete at early ages and the effect of using blended cements. Mineral additives and amount by weight of total binder used in the blended cements are fly ash (25%), ground granulated blast furnace slag (25%), and silica fume (10%). The properties investigated include tensile creep, elastic modulus, split tensile strength, and autogenous shrinkage. The relaxation modulus used for stress prediction was obtained from the creep data fitted using a log-power creep function. These findings show that tensile creep and stress relaxation are important properties of Portland cement concrete. These properties however are reduced in concretes containing blended cements. Blended cements affect the early age strength and elastic modulus moderately but significantly alter the autogenous deformation. Water/cement ratio (w/c), type and dosage of mineral additives were found to influence the magnitude of autogenous deformation. This deformation was found to be significant in low water-cement ratio concretes and should be included in early age stress calculations.

Résumé

L'objectif principal de cette étude est d'explorer les propriétés importantes qui influencent le développement des contraintes dans le béton au jeune âge et particulièrement les effets dus à l'utilisation de ciments composés. Les additifs minéraux utilisés et leur poids en proportion du ciment composé sont: 25% de cendres volantes (FA), 25% de laitiers de hauts-fourneaux granulés (GGBS) et 10% de fumée de silice. Les propriétés étudiées comprennent le fluage en tension, le module d'élasticité, la résistance en tension (essai brésilien), et le retrait endogène. Le module de relaxation utilisé pour la prédiction des contraintes a été obtenu à partir des essais de fluage utilisant une fonction logarithmique. On observe que le fluage en tension ainsi que la relaxation des contraintes sont des propriétés importantes qui diminuent avec l'utilisation de ciments composés. Le rapport eau/ciment, le type et le dosage d'additifs minéraux influencent la valeur du retrait autogène. On trouve que cette déformation est importante et doit être prise en considération dans le calcul des contraintes au jeune âge.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, University of Michigan, USA

    I. Pane & W. Hansen

Authors
  1. I. Pane
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  2. W. Hansen
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Editorial Note Prof. Will Hansen is a RILEM Senior Member. He participates in the work of RILEM TC 181-EAS: ‘Early age shrinkage induced stresses and cracking in cementitious systems’.

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Pane, I., Hansen, W. Early age creep and stress relaxation of concrete containing blended cements. Mat. Struct. 35, 92–96 (2002). https://doi.org/10.1007/BF02482107

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  • DOI: https://doi.org/10.1007/BF02482107

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