Cortec MCI® Grenades, Patented

Product Description

MCI® Grenades consist of powder Migrating Corrosion Inhibitors (MCI®) packaged in water-soluble PVA bags. MCI® Grenades are convenient to use and are available in three sizes for easy dosing.

When incorporated into concrete, MCI® Grenades form a protective, molecular layer on embedded metals that inhibits corrosion. In new construction, this is quantified by an increase in critical chloride threshold and subsequent reduction in corrosion rates when corrosion does initiate. In repair, MCI® Grenades not only reduce corrosion on metals within the patch area, but are also able to migrate into undisturbed concrete adjacent to the repair to protect reinforcement already in place near the patch. 

UFI: DD11-N0UV-S009-1JJJ

Packaging and Storage

MCI® Grenades are available in 1.1 lb (500 g) bags (40 per drum). MCI® Metric Grenades are available in 1.43 lb (650 g) bags (32 per drum). MCI® Grenades XL are available in 5 lb (2.3 kg) bags (10 per drum). Please see MCI® Mini Grenades if you need sizes for bags of repair mortar.

To ensure best product performance, store in original packaging, indoors, and out of direct sunlight at 40-100 °F (4-38 °C). 

Shelf life: 1 year

How it works

MCI® Grenades are organic corrosion inhibitors that dissolve easily when in contact with water in the concrete mix. During mixing, the bag will completely dissolve and the MCI® compounds will disperse throughout the mix.

MCIs protect reinforcing steel, galvanized steel, and other metals embedded in concrete from corrosion induced by carbonation, chlorides, atmospheric attack, and other corrosives. MCI® Grenades are considered ambiodic (mixed) inhibitors, meaning they protect both anodic and cathodic areas within a corrosion cell. MCI® Grenades contain a blend of amine salts of carboxylic acid, which form a protective, molecular layer on embedded reinforcing steel they come into contact with.

MCI® Grenades are effective at enhancing durability and extending the useful service life of both new construction and repairs exposed to corrosive environments.

Where to use

• Reinforced concrete including precast, prestressed, and post-tensioned structures  
• Corrosive environments including exposure to deicing salts, marine environments, saline groundwater, airborne chlorides, and carbonation  
• Structures such as concrete bridges, highways, parking garages, balconies, pools, storage tanks, pilings, substructures, pillars, pipes, and utility poles  
• Restoration and repair of all reinforced concrete commercial and civil engineered structures

 Advantages

• Premeasured and prepacked: easy to dose and handle in plant or onsite  
• Lower toxicity and environmental impact than traditional corrosion inhibiting admixtures such as calcium nitrite 
• Low dosage rate with minimal effect on concrete properties (i.e., workability, strength, air entrainment, etc.)
• Dosage rate independent of expected chloride exposure  
• Ability to migrate through porous substrates (concrete, masonry, limestone, etc.) by capillary action, vapor diffusion, and ionic attraction  
• Lab and field tested worldwide