Matériaux et Construction

, Volume 12, Issue 3, pp 193–199 | Cite as

Poker chip tests on bituminous concrete

  • D. BynumJr.
Article
  • 67 Downloads

Abstract

The scope of this work was to obtain the constitutive relations for bituminous concrete loaded in hydrostatic tension, since this is usually the most critical loading mode, i. e., the ultimate strain is less and the ultimate stress is greater than for any other mode of tension loading. Four bituminous concretes were tested using the poker-chip configuration. All of the procedures were the same except that asphalts from two sources were used, one of these asphalts was modified with latex, and ground rubber aggregate was added to the fourth mixture. The variation of ultimate hydrostatic tensile strain was small, but the variation of stress was significant as a function of rate of loading, binder type, or binder additive. The addition of ground tire rubber to the aggregate increased the ultimate strain 25%, and more importantly, increased the mechanical aging index from 0.57 to 0.81.

Résumé

Le but de ce travail était d'obtenir les équations du comportement du béton bitumineux chargé en traction et compression hydrostatiques étant donné que c'est là le mode de chargement le plus rigoureux, puisqu'il détermine une moindre déformation ultime et une plus grande contrainte ultime que tout autre mode de chargement en traction. Quatre bétons bitumineux ont été soumis à un essai selon le dispositif dit «poker chip». Les conditions d'essai étaient les mêmes sauf que l'on a utilisé des asphaltes de deux origines, que l'un de ces asphaltes était additionné de latex, et que l'on a ajouté un granulat de caoutchouc broyé au quatrième mélange. On a constaté une faible variation de la déformation ultime en compression hydrostatique et traction mais la variation de contrainte était notable en tant que fonction de la vitesse de chargement, du type de liant ou du produit d'addition. L'addition du pneu broyé au granulat a déterminé une augmentation de la déformation ultime de 25% et, ce qui est plus important, une augmentation de l'indice de viellissement mécanique qui est passé de 0,57 à 0,81.

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Copyright information

© Bordas-Durnod 1979

Authors and Affiliations

  • D. BynumJr.
    • 1
  1. 1.State of Texas, the Engineering Manager of Starfire Engineering, Inc.Spring

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