INFLUENCE OF SPECIMEN GEOMETRY, ORIENTATION OF CASTING PLANE, AND MODE OF CONCRETE CONSOLIDATION ON EXPANSION DUE TO ASR

This article reports on a study in which concrete specimens of different sizes and shapes were made with various reactive aggregates and stored under conditions favorable to the development of alkali-silica reactivity (ASR), with their expansion measured with time along the three directions. They have been cast vertically (cylinders and prisms) or horizontally (prisms and larger blocks), using a vibrating table, a vibrating needle, or rodding. The results show that the expansion due to ASR was always greater in the direction perpendicular to the casting plane. The higher the number of flat and elongated particles in the reactive aggregate, the higher the coefficient of anisotropy, defined as the ratio between the expansions perpendicular and parallel to the casting plane. Consolidation by rodding induced anisotropy coefficients distinctly smaller than consolidation using a vibrating table, while a vibrating needle induced intermediate values; however, all methods gave constant volumetric expansion at least up to an important expansion level. The authors conclude that, when evaluating field concrete affected by ASR, it appears important to consider the orientation with respect to the casting plane of the core samples subjected to mechanical or residual expansion tests.

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  • Corporate Authors:

    ASTM International

    100 Barr Harbor Drive
    West Conshohocken, PA  United States  19428-2959
  • Authors:
    • Smaoui, N
    • Berube, M-A
    • Fournier, Benoit
    • Bissonnette, B
  • Publication Date: 2003-12

Language

  • English

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Filing Info

  • Accession Number: 00986557
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 22 2005 12:00AM