Assessment of Chloride Content of I-65 Bridge Decks Prior to Overlay, FRT 193

KYTC will be letting a contract to Rosphalt 4 miles of Interstate 65 (northbound and southbound) in Jefferson County. There are approximately twenty bridges which will have deck repairs and then will be resurfaced with Rosphalt. There are questions about what happens with chloride contamination in the concrete bridge deck after the resurfacing. The resurfacing may decrease the presence of chlorides at the Rosphat/concrete interface if the Rosphalt remains impermeable or it could collect chlorides if they travel through the Rosphalt and result in increased contamination. KTC proposes collecting concrete deck samples for chloride assessment prior to resurfacing. The samples will be collected in a wheel path and a gutter of each bridge. Chloride content of the various decks and deck locations will be determined by laboratory analysis of the collected samples. A memorandum report will be issued documenting sampling dates, locations and chloride content. Follow-up chloride assessment would be conducted under the "Long Term Monitoring" task at intervals determined by KYTC.