A CONDITION ASSESSMENT OF PILE JACKETS UPON FLORIDA COASTAL BRIDGE SUBSTRUCTURES
-
Published:2002
W H Hartt, M Rapa, R G Powers, 2002. "A CONDITION ASSESSMENT OF PILE JACKETS UPON FLORIDA COASTAL BRIDGE SUBSTRUCTURES", Challenges of Concrete Construction: Volume 6, Concrete for Extreme Conditions: Proceedings of the International Conference held at the University of Dundee, Scotland, UK on 9–11 September 2002, Ravindra K. Dhir, Michael J. McCarthy, Moray D. Newlands
Download citation file:
Corrosion and mechanically damaged bridge pilings in Florida coastal waters have, since the 1940's, been repaired and rehabilitated by jacketing; that is, by 1) removing loose concrete, 2) placing a formwork about the damaged zone (usually from mean low water to a height of several meters), and 3) filling the annulus with mortar or concrete. However, removal of jackets from pilings of two bridges that were being rehabilitated revealed that reinforcement corrosion was often severe and structural integrity reduced. Consequently, a condition assessment of jacketed pilings on 19 representative bridges was performed. This involved a visual condition assessment followed by removal of a portion of the jacket and characterization of the underlying condition. The pre and post-inspection conditions were quantified using a Numerical Condition Rating (NCR) with the difference between the two values (ΔNCR) being taken as a measure of the extent to which piling damage was obscured by the jacket. Influences of jacket age, jacket type, pile reinforcement type (prestressed versus conventional), and piling pre-jacketed condition were evaluated. A mechanism for the deterioration is proposed, and a recommendation was made that jacketing be discontinued as a stand-alone piling repair/rehabilitation strategy.
INTRODUCTION
FIELD SURVEY AND CONDITION ASSESSMENT
DETERIORATION MODEL FOR JACKETED PILINGS
CONCLUSIONS
ACKNOWLEDGEMENTS
REFERENCES
