Volume 31, Issue 2 (March 2008)

    Influence of Test Method on Direct Shear Behavior of Segmental Retaining Wall Units

    (Received 13 November 2006; accepted 31 July 2007)

    Published Online: 2007

    CODEN: GTJOAD

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    Abstract

    This paper reports the results of interface shear testing carried out to investigate the influence of test methodology on shear-displacement behavior of five different segmental (modular) masonry concrete block configurations. The tests were carried out in general conformance with existing ASTM and National Concrete Masonry Association test protocols. Three different normal load arrangements were investigated: (1) flexible airbag, (2) fixed vertical piston, and (3) an adjustable vertical piston. A video-extensometer camera device was used to record block deformations in the vertical plane during testing. The test results showed that the three load arrangements gave similar shear capacity failure envelopes for the frictional block system with flat concrete surfaces. For more typical block systems with concrete shear keys and trailing lips that exhibit dilatant interface shear behavior, or a system with shear pins, the most consistent test results were developed using the flexible airbag arrangement. The results of this paper can be used to guide the selection of the loading arrangement for conventional laboratory modular block shear testing.


    Author Information:

    Bathurst, Richard J.
    Professor and Research Director, GeoEngineering Centre at Queen’s-RMC, Department of Civil EngineeringRoyal Military College of Canada, Kingston, Ontario

    Althoff, Sebastian
    Fachhochschule Muenster—University of Applied Sciences, Department of Civil Engineering, Muenster,

    Linnenbaum, Peter
    Fachhochschule Muenster—University of Applied Sciences, Department of Civil Engineering, Muenster,


    Stock #: GTJ100911

    ISSN: 0149-6115

    DOI: 10.1520/GTJ100911

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    Author
    Title Influence of Test Method on Direct Shear Behavior of Segmental Retaining Wall Units
    Symposium , 0000-00-00
    Committee D35