Performance of Overlays Placed Over Sealed Decks under Static and Fatigue Loading
Publication: Journal of Bridge Engineering
Volume 7, Issue 4
Abstract
In order to enhance the effectiveness of portland cement overlays placed over existing bridge decks, the deck may be sealed with an acceptable sealer before placing the overlay. The main purpose for such a treatment of the deck is to seal the existing cracks, and prevent penetration of chlorides into the deck if the overlay cracks. The presence of a sealer at the deck-overlay interface is expected to reduce the available bond strength. The reported research was carried out to investigate the performance of overlays placed over sealed bridge decks, examine the level of bond strength, and develop simple yet effective means to restore the bond strength as much as possible. Test results indicate that the sealer reduces the available bond strength by as much as 50%. Up to 85% of the bond strength can be restored if sand is broadcast over the sealer while it is curing or if the dried sealed surface is lightly sanded. These observations were validated through fatigue loading and loading to failure of a one-third-scale subassemblage of a steel stringer bridge.
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References
AASHTO. (1996). Standard specifications for highway bridges, Washington, D.C.
Gillum, A. J., Cole, J., Turer, A., and Shahrooz, B. M. (1998). “Bond characteristics of portland cement overlays on sealed existing bridge decks.” Rep. No. UC-CII98/02, Cincinnati Infrastructure Institute, Cincinnati.
National Research Council. (1993). “Mechanical behavior of high performance concretes, Vol. 1: Summary report.” Rep. No. SHRP-C-361, Strategic Highway Research Program, Washington, D.C., 93–98.
Shahrooz, B. M., Gillum, Arnol J., Cole, Jeremiah, and Turer, Ahmet(2000). “Bond characteristics of overlays placed over bridge decks sealed with HMWM.” Transp. Res. Rec., 1697, 24–30.
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Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Jan 30, 2001
Accepted: Aug 19, 2001
Published online: Jun 14, 2002
Published in print: Jul 2002
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