MCI®-309: The Easy Corrosion Solution for Post-Tension Grouting Delays—Now Without Silica!


Delays in the construction industry are common. This is especially true for large projects such as bridges that may take several years to complete. For structures that use post-tensioning, grouting is one step that is often postponed for several weeks or months due to cold weather, transit of precast segments, or other project delays. During this time, post-tensioning (PT) tendons installed in PT ducts are at risk for corrosion, especially in environments of extreme moisture, chlorides, or high temperatures. While it can be difficult to protect these tendons in such hard-to-reach areas, Cortec® Corporation has provided a simple solution by offering MCI®-309—a Migrating Corrosion Inhibitor that requires no flushing before grouting. MCI®-309 has been improved this year by removing silica from its formulation!

Protect Post-Tension Cables from Corrosion

MCI®-309 is a powder-based Migrating Corrosion Inhibitor for protection of ferrous and aluminum metals located in recessed areas, interior cavities, and structural voids. It is an extremely efficient dry method of protecting metals within an enclosed space by simply dosing MCI®-309 powder into the void. Upon application, it vaporizes and forms a molecular layer of corrosion inhibitors on the metal surface. If this layer is ever compromised (for example, by moisture or by opening the enclosed space), it will be automatically replenished by new vapor being continuously released from the powder carrier. MCI®-309 is considered ambiodic (mixed), meaning it protects both anodic and cathodic corrosion sites of the metal. It does not contain silica, silicates, phosphates, nitrites, or heavy metals.


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