NONDESTRUCTIVE EVALUATION OF BRIDGE FOUNDATIONS

This paper focuses on the applications of new developments in stress wave techniques for the identification and quantification of defects in bridge foundations. The two methods discussed in this paper are Crosshole Sonic Logging (CSL) and Crosshole Tomography (CT). The Crosshole Sonic Logging method measures the travel time of stress waves as they travel between tubes or coreholes in concrete or stone structures. While CSL technology is very effective in detecting anomalies and defects, it also provides a good indication of defect size, position, and severity within a foundation. Crosshole Tomography is a technique that produces a "slice" or a plot of the concrete condition between the tubes. This plot clearly shows the defect size, severity, and position between the tubes. Crosshole Tomography uses multiple CSL logs taken around a defect and a powerful computer program to calculate the position and severity of the defect. Discussed in this paper are two case studies on two drilled shaft foundations in California, where Crosshole Sonic Logging and Crosshole Tomography tests were performed.

Corporate Authors:
Technomic Publishing Company, Incorporated

851 New Holland Avenue, Box 3535
Lancaster, PA United States 17604
Authors:
- Aouad, M F
- Olson, L D
Conference:
- Structural Materials Technology. An NDT Conference.
- Location: San Diego, CA
- Date: 1996-2-20 to 1996-2-23
Publication Date: 1996

Language

English

Media Info

Features: Figures; References;
Pagination: p. 293-298

Subject/Index Terms

TRT Terms: Bridge foundations; Case studies; Computer programs; Concrete structures; Defects; Detection and identification; Detectors; Nondestructive tests; Stresses; Technology; Waves
Uncontrolled Terms: Drilled shafts; Stress waves
Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

Accession Number: 00725893
Record Type: Publication
Files: TRIS
Created Date: Sep 16 1996 12:00AM