NDLI: Influence of autogenous shrinkage on early age behaviour of structural elements consisting of concretes of different ages

Content Provider	Springer Nature Link
Author	Bernard, O. Brühwiler, E.
Copyright Year	2002
Abstract	In structural elements consisting of concretes of different ages, physical and chemical deformations induced by heat release and autogenous shrinkage during the hydration of new concrete are restrained by the old concrete. Depending on the amplitude of these deformations and on the degree of restraint of the hybrid element, full-depth cracks can be induced in the new concrete layer at an early age. An experimental investigation on four hybrid elements was conducted to study this early age behaviour. The temperature evalution and global strains (measured using optical fiber sensors) during hydration are presented. Comparison of the experimental results with a numerical model shows that autogenous shrinkage has the most important influence on the evolution of the strains and internal stresses in the tested hybrid elements at early age.Lors de la construction d'éléments de structure formés de bétons d'âges différents, les déformations physico-chimiques induites par le dégagement de chaleur et par le retrait endogène au cours de l'hydratation du nouveau béton sont entravées par le vieux béton. En fonction de l'amplitude de ces déformations et du degré d'entrave de la structure hybride, des fissures traversantes peuvent être induites au jeune âge dans la nouvelle couche. Des mesures de température et de déformations globales obtenues à l'aide de capteurs à fibres optiques durant l'hydratation de la nouvelle couche de quatre éléments hybrides sont présentées. Lors de la validation de la modélisation numérique proposée, l'influence prépondérante du retrait endogène sur l'évolution des déformations et des autocontraintes induites dans les éléments hybrides testés a pu être confirmée.
Starting Page	550
Ending Page	556
Page Count	7
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	35
Issue Number	9
e-ISSN	18716873
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2002-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Theoretical and Applied Mechanics Structural Mechanics Mechanical Engineering Operating Procedures, Materials Treatment Civil Engineering Building Materials
Content Type	Text
Resource Type	Article
Subject	Building and Construction Mechanics of Materials Materials Science Civil and Structural Engineering

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