According to certain rules of technology, the durability and design of the service life of the construction is often around 50 years. It can be greatly expanded with regular maintenance–Otherwise, the structure should be demolished and rebuilt. By using MCI® technology in highly corrosive environments, constructions should be more resistant to corrosion and thus have a longer service life.
Increased durability means fewer repairs, improved structural integrity, and longer life–all lead to more sustainability. To put it more simply: maintenance is essential.
Corrosion is the deterioration of materials over time. It is a serious problem for engineers who use metal products in their structures as it can pose a major safety hazard. Ignoring this super powerful force can have tragic consequences.
Three important potential consequences of corrosion:
- Life-threatening accidents resulting in death
- Economic cost of removing the corrosion damage
- Environmental damage threatens the ecosystem
Crumbling infrastructure is a global problem
For example, In 2018, the Morandi Bridge collapsed in Genoa, Italy points out that neglecting corrosion can have fatal consequences. Engineers have voiced numerous concerns about its unusual concrete-sheathed common steel cables. The designer of the Genoa Bridge warned four decades ago that given the effects of sea air corrosion and pollution of the concrete, it would require constant maintenance to remove rust. The problem of fatigue corrosion on metal elements, in particular with steels with high mechanical strength such as strands, is still little known. “Since this steel and prestressed concrete bridge has existed for more than 35 years, the corrosion of tendons or reinforcement was a factor,” says Ivana Liposcak, MCI® Technical Support Manager for Europe at Cortec.
“The long-term behavior of heavily trafficked viaducts in [an] The aggressive environment shows that at the time of planning, many concepts for the load-bearing capacity of the bridge were obviously not yet known and had been taken into account. The vibrations in the concrete create microcracks, through which the moisture leads to oxidation and corrosion of the steel and so on [the] Structure gradually loses its capacity due to corrosion, ”notes Liposcak.
This is how you build and maintain permanent structures
There have been tremendous advances in technology over the past two decades to extend the life of structures and prevent possible tragedies. The patented MCI® technology was developed to protect reinforcement metal in concrete from corrosion and is widely used around the world. The application of MCI® products has seen rapid growth in recent years due to a number of factors including proven efficiency and environmental benefits. The use of this technology delays the initiation of corrosion and significantly extends the service life of structures. One of the most efficient uses of Migrating Corrosion Inhibitors (MCI®) is direct application during the construction phase and use as part of the maintenance repair system in existing structures.
Sustainable building has become a goal for owners around the world. Often the durability and life of the final construction is overlooked. However, this is undoubtedly one of the main drivers of structural sustainability. Many MCI® inhibitors are made from a renewable raw material, which allows users to earn certain LEED points.
Restoration of the Maslenica Bridge
There are many instances where Migrating Corrosion Inhibitor ™ technology is used in projects in salty and corrosive environments around the world. Take, for example, the Maslenica Bridge in Croatia, one of the largest bridges of its kind with an arch of 200 meters (218.7 yd) in diameter. Due to the aggressive environment with changing temperatures, constantly fluctuating humidity and strong winds that contained salt from the sea water, the reinforcing steel began to corrode, causing concrete to flake off.
In order to restore the bridge and prevent future corrosion, all flaking concrete as well as dirt and corrosion on the rebars were blasted with water. CorrVerter® MCI® Rust Primer was brushed onto exposed rebar to passivate the metal from further corrosion, and MCI®-2020 was applied to the entire concrete structure with an airless sprayer to prevent potential corrosion that was not visible.
Prince Mohammed Bin Abdulaziz Medical City
Another project experienced construction delays after most of the concrete work was completed. The main problem was corrosion on exposed rebars of a significant number of fillers and expansion joints that had to be protected from the corrosive environment during the deceleration. Two levels of protection were carried out: Rusted rebars were treated with CorrVerter® MCI® Rust Primer and MCI® CorShield® was then applied to all exposed rebars to provide the required external protection during the construction delay. This represented an economical and efficient solution to preserve the exposed reinforcement and to meet the requirements of all those involved in the project.
Durability when using reinforced concrete structures is the basis for the long-term preservation of structures. The durability of structures depends on a good and professional choice of materials that will help prevent damage. In the event of damage, the renovation should be approached with great care and responsibility, choosing a product that is compatible with the materials used in the construction in order to avoid major damage or the demolition of the building itself. Cortec® has a wide range of products that can contribute to a longer service life and, above all, more safety.