Abstract
The dynamic moduli and the damping properties of hardened paste, mortar matrix and concrete prisms excited in the fundamental longitudinal, flexural and torsional vibrations are presented. The effects on dynamic properties of curing conditions, water-cement and aggregate-cement ratios, the type of aggregate, mode of vibration and of the presence of rigid inclusions in a relatively soft matrix are investigated. The stress-strain behaviour and the mechanism of damping of cementitious materials are discussed. Relations between dynamic moduli and strength, between damping capacity and compressive strength, and between dynamic moduli and the properties of the constituents are presented.
Résumé
On étudie les modules dynamiques et les caractéristiques d'amortissement de la pâte durcie, du mortier et des prismes de béton sollicités par des vibrations longitudinales, de flexion et de torsion aux fréquences fondamentales. On considère les effets sur les propriétés dynamiques des conditions de conservation, des rapports eau/ciment et agrégat/ciment, du type d'agrégat, du mode de vibration et de la présence d'inclusions rigides dans une matrice relativement molle.
Les modules dynamiques des matériaux liants croissent avec le vieillissement et décroissent avec l'augmentation de la teneur en eau, mais le décrément logarithmique décroît avec le vieillissement et croît avec la teneur en eau. L'addition de sable à la pâte et de gros agrégat au mortier augmente les modules dynamiques mais diminue ensuite la capacité d'amortissement, la vitesse de variation dépendant de la teneur en eau et de la quantité et du type d'agrégat.
Le séchage diminue à la fois le module dynamique et le décrément logarithmique, mais la variation du module élastique est beaucoup plus failble que celle de l'amortissement. La diminution est en partie un processus irréversible et généralement est plus faible pour le mortier que pour le béton. Les résultats montrent qu'il est douteux que les propriétés des liants puissent dépendre uniquement de leurs propriétés de résistance pour tous les composants.
Les modules de résonance longitudinalement et en flexion sont pour les liants à peu près les mêmes dans les éprouvettes humides, tandis que le module de cisaillement est environ de 40 à 45% du module de Young correspondant. L'amortissement est plus fort en vibration longitudinale et moindre pour les vibrations de torsion. On montre que l'amortissement dans les matériaux liants dépend avant tout de la teneur en eau et qu'il résulte d'une combinaison complexe d'effets de viscosité, de frottement et de réactions de l'état solide. L'amortissement se produit surtout dans le mortier, en partie aux interfaces, et dans une moindre mesure dans l'agrégat.
Les relations entre contrainte et déformation, module dynamique et résistance, entre amortissement et résistance à la compression, et entre le module dynamique et les propriétés des constituants sont examinées.
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Swamy, N., Rigby, G. Dynamic properties of hardened paste, mortar and concrete. Mat. Constr. 4, 13–40 (1971). https://doi.org/10.1007/BF02473927
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DOI: https://doi.org/10.1007/BF02473927