Item(s) of Interest 75' single span, with 27" box beams and a concrete wearing surface. Let in May 2005 -- this is one of the first box beams/concrete wearing surface projects. There has been some internal debate on the adequacy of current amounts of post-tensioning. Observations and Points of Discussion: The concrete overlay appeared to be performing well, with no observable general cracking There were two full-length longitudinal cracks approximately 9'-0" from the exterior on both sides of the bridge (adjacent to the painted lane lines). The longitudinal cracks propagated across the elastomeric concrete joint header There was a diagonal crack at each of the four corners of the concrete overlay Elastomeric concrete headers looked very grainy/cementitous Installation of joints looked shoddy, and the joint seals were not well glued to the elastomeric headers. Joint seals were turned up and recessed too far in the rail joint creating a debris dam. ACTION ITEM(S): Structure Design will investigate ways to mitigate the cracks in the overlay by possibly changing design details. Structure Design will detail the joint seal closer to flush with the face of the barrier rail.
Observations and Points of Discussion:
ACTION ITEM(S): Structure Design will investigate ways to mitigate the cracks in the overlay by possibly changing design details. Structure Design will detail the joint seal closer to flush with the face of the barrier rail.
NC DOT
NC DOH
NC GOV
