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TDR MEASUREMENT OF BRIDGE PIER DEGRADATION
January 1995
Slides taken by Charlie Pierce
- SLIDE NO. 1. Two 1/2 inch diameter, coaxial cables were selected for column
installation. A smooth aluminum outer conducting cable is shown on the left;
a corrugated copper outer conducting cable is shown on the right.
- SLIDE NO. 2. Full view of base beam length (12 feet) showing steel dowel
reinforcement for two columns.
- SLIDE NO. 3. Coaxial cables were painted before installation to protect metal
during concrete curing.
- SLIDE NO. 4. Corrugated copper cables were placed vertically along dowel
reinforcement. Cable ends were sealed with plastic tips.
- SLIDE NO. 5. Cables are bent in a smooth, 90 degree arc inside the reinforced
base beam to create a perpendicular exit from the form.
- SLIDE NO. 6. Two cables exiting beam at right angles; cable monitoring will be
conducted from these exposed ends.
- SLIDE NO. 7. Closeup view of two cables attached to steel reinforcement for one
column.
- SLIDE NO. 8. Lengthwise view of beam reinforcement showing installed
cables.
- SLIDE NO. 9. After first beam was cast in concrete, forms are removed, showing
exposed cables.
- SLIDE NO. 10. Finally, a full view of the concrete beam with the dowel
reinforcement and coaxial cables exposed.
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