Post-Tensioning (PT) tendons are sensitive to corrosion due to their smaller diameter and higher risk of failure under tension. It is imperative that proper measures are taken to protect them throughout their lifecycle:
During Transit and Storage:
PT tendons should be packed in VpCI®packaging that has no deleterious effect on steel or concrete or bond strength of steel to concrete.
In Duct prior to Grouting:
In the event of delays in grouting beyond 7 days, MCI®-309 should be fogged into the duct and sealed to protect the tendons from corrosion.
For protection of tendons during operation, MCI®-2006NS should be added into the grout mix design.
Corrosion protection for Post-tensioned structures
Post-tensioned concrete elements are at higher risk for corrosion due to its smaller diameter and high tension. Corrosion of post-tensioned tendons can lead to wire or tendon break and possible collapse is a serious problem. Highly stressed post-tensioned steel possesses unique risks for injury and property damage due to its stored energy that can release if not handled with care.
Corrosion protection for post-tensioned structures is not just needed but it is a must for the safety of the surroundings. Corrosion protection for post-tensioning tendons can be effective and successful which leads to increased service life. Regular checkups of the post-tensioned structures can help in exposing the potential weaknesses. Corrosion is an ever-present enemy for metal components in outdoor environments.
The most effective way to manage deterioration of a structure is to keep up with its maintenance. Cortec® VpCI® and MCI® are the technologies used for the protection of post-tension tendons.
Cortec® provides services in Oman, Qatar, Egypt, Saudi, Kuwait, UAE.