Emerald Isle Bridge
Assessment, NBIS Inspection, and Repairs
In March 2011, Alpha & Omega Group provided an NBIS Inspection and a structural condition assessment of the Emerald Isle Bridge located in the southern Bogue Banks. The bridge provides access from the mainland to Emerald Isle across the Intracoastal Waterway.
The bridge consists of 59 spans of varying lengths of pre-stressed precast concrete AASHTO girders with a center “drop-in” span. The superstructure is supported by cast-in-place reinforced concrete post and beam piers on pile caps and pre-stressed precast piles. The overall length of the bridge is approximately 4,612 feet.
Alternate decks were sampled for chloride penetration and each bridge component was core sampled for compressive strength and chloride penetration. Petrographic analysis was performed to determine carbonation, mineralogy and microstructure of the concrete and aggregates.
As part of the team, Collins Engineers provided underwater inspections and extracted concrete cores for testing.
Overview
- Client:
NCDOT Structures Management Unit - Location:
Bogue Banks, NC - Contact:
Rick Nelson, PE
NCDOT Bridge Management Unit
919-707-6530
enelson@ncdot.gov - Start / completion:
3/2011 – 9/2012 - Project fee:
$3.6M - Project manager:
Glenn Zeblo, PE
Experience
- Visual inspection
- Structural condition assessment
- Documentation
Relevant Images
