Case History #393: North-South Roadway Bridge Deck Protection

October 28, 2021

Construction delays are inevitable at times, and that may have a detrimental impact on the longevity of
post tensioning (PT) tendons if corrosives get to them. These delays could result in PT tendons sit on site longer prior using them or they may be installed but the grouting is delayed (in bonded PT systems). In both cases, these delays lead to more exposure to contaminants and ultimately PT tendons corrode faster.
North-South Roadway Bridge located in Oahu, Hawaii, had utilized the power of vapor phase corrosion
inhibitors in Cortec’s MCI®-309 to protect PT tendons from corrosion due to grouting delays. The same project also used Cortec’s MCI®-2005NS to protect the steel reinforcement in the bridge deck concrete.

Read the full case history here.

For a PDF version please click here.

Keywords: MCI, Migrating Corrosion Inhibitors, Cortec, concrete surface preparation, concrete additives, concrete, corrosion, corrosion inhibitor, surface applied, grouting, post-tensioning, rebar, restoration, concrete restoration, concrete sealant, service life, concrete service life, from grey to green post tensioning cables, construction delays, PT tendon, PT strands, post tension bridges, post tension concrete, corrosion of post tension cable, grouting delays, grouting delay requirements