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Thoughts about drying shrinkage: Experimental results and quantification of structural drying creep

Content Provider	Springer Nature Link
Author	Granger, L. Torrenti, J. M. Acker, P.
Copyright Year	1997
Abstract	In this second article, we examine in greater detail the influence of concrete skin micro-cracking, linked with the non-uniformity of water content within the specimen. This cracking is responsible for the drying creep which results from a structural effect, also called “microcracking effect”, and which we prefer to call “structural creep” here. It is defined as the difference between the potential drying shrinkage of a specimen which does not crack and the shrinkage measured experimentally. We propose a simple experimental method making use of experimental curves of drying shrinkage as a function of weight loss and allowing the flanking and specification of certain properties of structural drying creep. We shall see that this method must also deal, in the interpretation of results, with the choice of the mechanical constitutive model allowing the processing of nonlinearities induced by concrete skin micro-cracking. Finally, to validate the hypotheses we have made, we shall base our approach on a probabilistic model of the cracking of concrete resulting from the work of Rossi, “coupled” with consideration of the drying of the concrete material in a sense that we shall specify. We shall see that this model is in satisfactory agreement with the curves of shrinkage as a function of weight loss. In addition, the results of simulations are very instructive, as regards the spacing and the width as well as the depth of cracks which appear in the drying shrinkage and creep tests.Dans ce deuxième article, nous étudions plus en détail l'influence de la fissuration de peau du béton, liée à la non uniformité de la teneur en eau au sein de l'éprouvette. Cette fissuration est responsable de la part du fluage de dessiccation qui résulte d'un effet de structure, appelé aussi «micro-cracking effect» par les anglo-saxons, et que nous appellerons ici: «fluage structural». Il est défini comme la différence entre le retrait de dessiccation potentiel d'une éprouvette qui ne fissurerait pas et le retrait mesuré expérimentalement. Nous proposons ici une méthode expérimentale simple, qui met à profit les courbes expérimentales de retrait de dessiccation en fonction de la perte en poids et qui permet d'encadrer et de préciser certaines propriétés du fluage de dessiccation structural. Nous verrons que cette méthode se heurte, elle aussi, dans l'interprétation des résultats, au choix de la loi de comportement permettant de traiter les non linéarités induites par la fissuration de peau du béton. Enfin, pour valider les hypothèses que nous avons prises, nous appuierons notre démarche sur une modélisation probabiliste de la fissuration du béton issue des travaux de Rossi, «couplée» avec la prise en compte du séchage du matériau béton dans un sens que nous préciserons. Nous verrons que cette modélisation permet de retrouver, avec un accord satisfaisant, les courbes de retrait en fonction de la perte en poids. Qui plus est, les résultats des simulations sont très riches d'enseignements, tant sur l'espacement que sur l'épaisseur et la profondeur des fissures qui apparaissent sur les essais de retrait et de fluage de dessiccation.
Starting Page	588
Ending Page	598
Page Count	11
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	30
Issue Number	10
e-ISSN	18716873
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1997-01-01
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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