MCI Protection used on Famous Structures in The World

  1. Empire State Building, United States of America (USA)
  2. Pentagon – United States Department of Defense, USA
  3. Vukovar’s water tower – Symbol of Croatian Independence, Croatia
  4. Burj Khalifa – World’s Tallest Skyscraper, Dubai
empire state building
vukovar
Pentagon USA
dubai

Protection of Reinforced Concrete Structures

Cortec MCI Migrating Corrosion Inhibitors 

Corrosion of reinforcing steel is the predominant cause of failure in reinforced concrete structures leading to financial losses, safety risks and environmental impact.

The understanding of the mechanisms and kinetics of the degradation processes of concrete allows us to improve the design of structures to enhance durability and extend service-life.

Adding MCI® Corrosion Inhibitors to concrete mixes is a simple, time-proven, cost-effective and environmentally friendly method of achieving significant enhancement in durability.

MCI®-2005 is a USDA-certified biobiased amine carboxylate inhibitor which meets the requirements of ASTM C1582 Standard Specification for Admixtures to Inhibit Chloride-Induced Corrosion of Reinforcing Steel in Concrete. MCI®-2005 widely used in the aggressive Gulf environment which combines high humidity with high temperatures and salinity.

For more information on Mitigating Corrosion Inhibitors (MCI®) please read the whitepaper Corrosion in Reinforced Concrete Structures

A Revolutionary Way to Extend the Service Life of Structures.

1. Admixtures

Time and time again, MCI products are shown to outperform the competition. Other admixtures rely on pore blockers or are limited by a chloride threshold. In contrast, MCI admixtures work independently of chlorides, protect even when cracks occur, and can actually delay set time for better workability. They do not affect the physical properties of concrete when used at the recommended dosage rates.

Independent Testing

MCI admixtures have been tested according to many ASTM standards. MCI-2005 NS and MCI-2005 AL have been shown to meet ASTM C1582. These materials met corrosion requirements according to extended G109 testing included in ASTM C1582, and treated samples did not even begin to show corrosion until approximately 20 cycles after the control began to corrode. In addition, MCI-2005 NS admixture has shown superior corrosion protection compared to both CNI and Amine/Ester admixtures when undergoing intense cycles of saltwater ponding on cracked concrete beams in modified ASTM G109 testing (cracked beam testing).

MCI
MCI surface treatment graph

2. Surface Treatment: Pure Inhibitors

MCI can be applied to existing structures as a surface treatment that reduces corrosion rates. This surface treatment is designed to penetrate into and migrate through cementitious materials to reach and protect embedded reinforcing metal. MCI surface treatments can be applied on vertical and overhead surfaces, as well as horizontal surfaces. MCI pure inhibitors do not contain water repellants but provide extra-strength corrosion protection to embedded rebar through a powerful dose of MCI inhibitors. These straight inhibitors work at rebar level to effectively protect reinforcing metal from corrosive elements with or without the use of sealers.

 

Surface Treatment: Water Repellant MCI

MCI sealers combine water repellency with the added protection of Migrating Corrosion Inhibitors. These MCI surface treatments seal surface pores to block carbonation and protect against the ingress of water, chlorides, and other aggressive contaminants. Below the surface, MCI® penetrates to the depth of embedded metallic reinforcement to form a protective monomolecular layer on the surface of the rebar. This protective layer delays the onset of corrosion and reduces corrosion rates after initiation, greatly extending the service life of structures.

 

Several MCI materials have been tested according to U.S. Bureau of Reclamation M-82 Protocol. The MCI materials were applied after 10,000 Coulombs of corrosion was reached in test slabs. This is the criteria used if the performance of the surface applied repair does not depend upon the amount of chloride present at the reinforcing bars, or if protection at a higher initial chloride content level is to be demonstrated. All materials tested were found to significantly reduce corrosion and cracking at a high level of chloride exposure.

3. Restoration – Repair

MCI is important for ensuring the longest possible lifespan of concrete restoration projects. MCI not only slows the rate of corrosion begun in deteriorating structures, but also protects against the troublesome ring anode/insipient anode effect that often follows concrete repairs. MCI is ideal and convenient to add to concrete repair mixtures and migrates through adjacent areas after application to protect embedded reinforcement. MCI is also available as a passivating grout for use on exposed rebar, or as a topical treatment to existing surfaces.

MCI®-2020 is a water-based, organic, surface-applied, migrating corrosion inhibitor designed to penetrate through cementitious materials including concrete, mortar, and limestone. It migrates in both liquid and vapor (gas) phases through the pore structure, forming a protective, molecular layer on embedded reinforcement and allowing vapor diffusion. MCI®2020 provides strong corrosion protection against carbonation, chlorides, and other contaminants and will migrate independent of orientation (horizontal, vertical or overhead up to 8 cm (3 inches) in 30 days.

4. Specialty Products

Cortec offers the flexibility of specialty products for multiple aspects of the construction industry. Many of these products are a result of customer suggestions that meet specific end user needs. In addition to Migrating Corrosion Inhibitors, Cortec offers products for concrete cleaning, rebar storage, and rust conversion.

 

a. Cleaning Oil Stains from Concrete

MCI-2061 is a powerful natural cleaner that safely and effectively cleans oil stains on concrete. Microorganisms in the cleaner remain inactive until the product is applied to pre-wetted concrete and rinsed. Microorganism spores that remain after rinsing continue to work to degrade residual stains from the concrete.

b. Protection of Exposed Reinforcement

MCI CorShield is a water-based coating for protection of exposed reinforcement. It forms a soft non-tacky film that eventually hardens. MCI CorShield provides up to 5 years of indoor protection and 6-24 months of unsheltered, outdoor protection.

c. Rust Converting Primer

CorrVerter is a water-based primer recommended for application on rusty or poorly prepared steel surfaces where corrosion protection is required and good surface preparation is difficult to achieve. CorrVerter penetrates rust, eliminates rust, and stops further rusting.

 

Contact us at vcitech@vcimalaysia.com on how you could protect corrosion of aboveground storage tanks through Cortec’s latest corrosion inhibition technology.

MCI 2005 Reinforced Concrete

MCI Admixture

mci logo