Detection of manufacturing flaws in composite retrofits

Gary F. Hawkins; Eric C. Johnson; James P. Nokes

doi:10.1117/12.339914

1 February 1999 Detection of manufacturing flaws in composite retrofits

Gary F. Hawkins, Eric C. Johnson, James P. Nokes

Proceedings Volume 3587, Nondestructive Evaluation of Bridges and Highways III; (1999) https://doi.org/10.1117/12.339914
Event: Nondestructive Evaluation Techniques for Aging Infrastructures and Manufacturing, 1999, Newport Beach, CA, United States

Abstract

Composite materials are being used for bridge column seismic retrofits and to rehabilitate other concrete structures. There are three different manufacturing methods for applying composites to concrete columns which are outlined in this paper. Each method has the potential for creating debonds at the composite-concrete interface and within the composite itself. Thermography is a non-destructive evaluation technique which can be used to image debonds below the composite surface. Background fundamentals of the thermographic technique are discussed. Data from thermographic tests of a variety of retrofit applications, which include examples for each of the three aforementioned manufacturing processes, are then presented. The paper concludes with a list of issues which need to be addressed when performing a thermographic inspection in the field.

Citation Download Citation

Gary F. Hawkins, Eric C. Johnson, and James P. Nokes "Detection of manufacturing flaws in composite retrofits", Proc. SPIE 3587, Nondestructive Evaluation of Bridges and Highways III, (1 February 1999); https://doi.org/10.1117/12.339914

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