The Identification of Corrosion-Related Damage from Cramp Anchors in a Limestone-Clad Building Façade Using NDE Techniques

    Volume 4, Issue 10 (November 2007)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 19 October 2007

    Page Count: 12


    VanOcker, David A.
    Principal, Staff Engineer, and Associate respectively, CVM Facilities Renewal, Wayne, PA

    Johnson, Erin M.
    Principal, Staff Engineer, and Associate respectively, CVM Facilities Renewal, Wayne, PA

    Marcotte, Tracy D.
    Principal, Staff Engineer, and Associate respectively, CVM Facilities Renewal, Wayne, PA

    (Received 21 October 2006; accepted 24 September 2007)

    Abstract

    A recent restoration project on a 100-year-old, limestone-clad building provided an opportunity to evaluate the efficacy of certain non-destructive evaluation (NDE) techniques in identifying corrosion-related distress of embedded cramp anchors. After decades of service, progressive corrosion of the anchors had caused limestone delaminations and spalls, and presented a life-safety risk when fragments of limestone became dislodged and fell from the façade. Adding to this risk, it became clear early in the investigation that for certain areas of corrosion damage, stone cracking was not apparent on the surface or was otherwise difficult to detect. In an attempt to identify these pre-emergent cracks and delaminations, a range of NDE methods was considered to supplement the traditional techniques of visual identification and sounding. Of the NDE techniques implemented (i.e., ultrasonic pulse velocity surveys, infrared thermographic scans), infrared thermographic scans proved to be the more effective diagnostic tool to locate pre-emergent cracking and delamination sites, and showed promise as an early detection technique for similar buildings.


    Paper ID: JAI100875

    DOI: 10.1520/JAI100875

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    Author
    Title The Identification of Corrosion-Related Damage from Cramp Anchors in a Limestone-Clad Building Façade Using NDE Techniques
    Symposium Repair, Retrofit and Inspection of Building Exterior Wall Systems, 2006-10-22
    Committee E06