Concrete Coatings And Rebar Coatings
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How does Cortec®'s MCI® Technology work?
Steel becomes conducive to corrosion after chlorides and carbonation break down its natural passivating protection. When Cortec®'s MCI® coating is applied to steel, it forms a layer of protection similar to our VpCI® technology. Using X-rays, this protective layer has been measured to be between 20-100 (?) thick at the molecular level.
MCI® 2000 Actually Displaces Chloride Ions at the Steel Surface
XPS Surface analysis testing has also proven MCI's ability to displace chloride ions from the surface of steel in chloride environments.
Cost Effectiveness Of MCI® Technology
- Small quantities can be added at the mixing plant or on the job site.
- Most repair or replacement work is costly to be cost effective, put it in FIRST.
- Environmentally friendly while eliminating clean-up costs.
- Set up time, slump or entrainment is not affected.
- Free chloride content is lowered.
- Existing structures can utilize emitter treatments and products applied to the surface.
- Fumed silica combinations also available.
Safety
MCI® products can be broken down in a biological waste treatment system at low concentrations, while spillage can be handled by diluting with large amounts of water.
Most of our MCI® products carry certification by Underwriters Laboratories® Inc., meeting ANSI/NSF Std. 61 which addresses potable drinking water contact.
Case Histories
Construction of Wells Fargo
Parking Garage
MCI® 2005 NS (214)
A six-level parking garage that houses 1,800 vehicles had 18-24 hours to get 22,000 cubic yards of concrete to meet or exceed 3,000 psi strength. After trying a calcium nitrate-based corrosion inhibitor, which failed to meet minimum strengths in the required 24 hours and also had shrinkage cracking, they switched to our Cortec® MCI® 2005 NS, which met all of the requirements in the timeframe needed, and also reduced shrinkage by 30% and eliminated shrinkage cracking even in extreme temperatures.
Restoration of the Pentagon Damage
MCI® 2020 V/O (046)
The Pentagon was having major problems with the concrete on its exterior walls, including carbonation, which lowered the pH of the concrete, causing corrosion. Corrosion of embedded reinforcing steel was also causing spalling on the walls. This tough situation required reducing or stopping the corrosion, a minimum 20-year design life, stop water absorption, and maintenance of the appearance of the exterior walls. Cortec's MCI® 2020 V/O was chosen for the repair and met the specifications exactly by applying 200,000 square feet of surface hand patch repair and more than 1,000,000 square feet treated with our MCI® 2020 V/O product along with a silicate-based coating.
DePere Waste Water Treatment Tanks
MCI® 2020, 2023, 2038 (219)
Spalled and corroding areas, leading to exposed rebar, had to be corrected after outdoor waste water tanks had been neglected for almost 20 years. After the concrete was pressure washed and sandblasted, the rebar was coated with MCI® 2023, spalled areas had repairs made with MCI® 2038, then MCI® 2020 was applied to all of the surface areas of the tanks. Customer satisfaction was high with this project, city of DePere has elected to continue to use the quality products manufactured by Cortec® to repair other tanks in the future.