SOLUTION

WJE coordinated the in-depth structure assessment, material sample removal, and materials testing; provided on-site assistance during the field work; reviewed concrete core samples; conducted petrographic studies; performed limited structural analysis and load rating; and developed recommendations in accordance with guidelines set forth by the Secretary of the Interior's Standards.

For the detailed inspection, all exposed concrete surfaces were evaluated to locate areas of unsound surface concrete. Nondestructive testing was performed to locate the position and depth of concrete cover for embedded reinforcing steel. Electrical potential testing was completed to determine the corrosion potential of the embedded reinforcing steel at selected locations. Destructive testing was performed to remove concrete cores, and petrographic and chloride content analyses were performed on them. Selected areas of the asphalt topping on the deck were removed to allow direct visual assessment of the top-of-deck surface. Lastly, reinforcing steel segments removed from the structure were tested to determine physical properties.

WJE engineers presented two rehabilitation options as well as a structure replacement option for each bridge. Cost estimates were developed for each option.