Title:
Lessons Learned from Condition Evaluation of UHPC Overlays
Author(s):
Foden
Publication:
Web Session
Volume:
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
10/23/2022
Abstract:
In a pilot program, four bridges in New Jersey were treated with ultra-high-performance concrete (UHPC) overlay. The overlay installation included complete removal of the existing bridge asphalt overlays, partial removal of the existing concrete deck surface, and a complete resurfacing of the bridge with a UHPC overlay. Prior to this pilot program, UHPC was not used as a bridge deck overlay in the state of New Jersey. To assist NJDOT in assessing the quality of the UHPC overlay, a nondestructive evaluation (NDE) testing plan was developed to assess the baseline conditions through an initial survey of the deck, followed by a periodic assessment of the UHPC-existing concrete bond over a two-year period. Impact echo and ultrasonic tomography were used. Additionally, pull-off tests were used to assess the bond quality between UHPC and original concrete. This study presents the results of the first year’s condition assessment.