Croatian Overpass Preservation The customer required protection to prevent against future corrosion- and to create a better appearance of the overpass.The concrete surface was water blasted to remove dirt, oil, and grease. Once dry, MCI®- 2020 Powder was applied by brush tothe surface and allowed to dry for 24 hours. Then MCI® Architectural Coating RAL 7035 (Gray) was applied as additional corrosionprotec- tion and a more appealing appearance within thelandscape. Cortec® provided an innovative solution to protect the overpass against future corrosion and provided an additional protective coating that offered a more natural look. The Spanish government requested renovation of the Leon bridge in Ruitelan, Spain. The goal of the project was to protect the highway bridge form corrosion. Corrosion protection of the concrete against chloride ions was conducted on of surface:8.800m2. After that passiv - ating grout was applied followed by repair mortar. Finally MCI-2020 was applied onto the surface. Rebar Preservation at Prince Mohammed Bin Abdulaziz Medical City Another project was facing construction delays after the majority of concrete work had been completed. The main issue was corrosion on exposed rebars of a significant number of in-fill beams and expansion joints that needed protection from the corrosive environment during the delay. Two stages of protection were conducted: Rusted rebars were treated with CorrVerter® MCI® Rust Primer and MCI® CorShield® was then applied on all exposed reinforcement to provide the neces - sary outdoor exposure protection during the construction delays. This provided an economical and efficient solution to preserve exposed reinforcement and satisfied the requirements of all parties involved in the project. Durability in the exploitation of reinforced concrete structures is the basis for the preservation of structures long-term. The durability of structures depends on a good and professional choice of materials that help to avoid damage. If damage occurs, rehabilitation should be ap - proached with great care and responsibility and selection of a product that is compatible with material used during construction, in order to avoid major damage or demolition of the building itself. Cortec® has a wide range of products that can help to achieve greater durability and, above all, safer structures.
is approximately 45 meters (49 yd), and the total façade area is ap- proximately 3,000 square meters (3588 yd²). The water tower’s frame is made up of six externally reinforced concrete pillars that have a U- shaped cross section. These pillars stand around a larger central pillar of reinforced concrete that houses stairs, an elevator, water pipes, and electricity installations. On top of these seven pillars is the water reser - voir. The reservoir is built of reinforced concrete with 14 tension cables running through rings in the outer walls. On the outside of the reser - voir, there are six pilasters, two of which serve as anchoring points for the tension cables. The concrete had been breaking down, with pieces falling off in several areas where the concrete covering the reinforce - ment had been consumed. The presence of chlorides in conjunction with concrete carbonation (which reduced the natural protective quali- ties of the concrete) had caused reinforcement corrosion. Fortunately, splint injuries had not become extensive enough to affect the bearing capacity to a greater extent. The damages were limited in size but relatively numerous. The situation was still serious because such large areas had high levels of chlorides and because concrete damage can develop at a rapid pace—especially in areas around the fastenings of the tension cables. The investigation also showed damage to fastenings of the tension cables that could affect bearing capacity. It was therefore important to slow down the development of claims in good time. The municipality wanted a repair method that would extend the structure’s durability by at least 20 years.
Old broken concrete on small areas was removed and Surfaces were cleaned
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November 2021 csengineermag.com
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