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Prestressed concrete cylinder pipe pipeline sections projected to exhibit wire breaks were detected - and one not so - were excavated, removed, inspected, and dissected. Corrosion had initiated upon the inner surface of shorting straps and spread to the prestressing wires. A mechanism for this corrosion is presented and the findings discussed.
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The effectiveness of organic commercial migrating inhibitors on steel reinforcements corrosion. Four series of concrete specimens were cast. Two organic migrating inhibitors were applied. Free corrosion potential and corrosion rate of steel rebar were periodically monitored for five years. Results show that migrating inhibitors are not effective in reducing corrosion rate.
This research was to determine if an iron carbonate (FeCO3) layer can be effective for prevention of CO2 corrosion of steel rebars, associated with production and use of carbonated calcium silicate cement-based concrete.
Structural engineering analysis is an important part of condition assessment of aging concrete structures. Structural engineers involved in condition assessment, maintaining, and repairing concrete structures need to be informed of the principles and practice of corrosion risks facing aging concrete structures. The approach towards this issue, from a corrosion engineer’s standpoint, is to do an inspection/condition assessment before making any form of judgements or recommendations.
Recent occurrences of high visibility structural failures have spurred interest to revisit inspection and repair of aging reinforced concrete structures. Chloride-induced corrosion can cause premature damage of structures in coastal regions. Corrosion induced by carbonation of the concrete and the concrete pore water, on the other hand can occur in many other environments including structures in both wet and dry exposures. This type of corrosion can become increasingly relevant in residential buildings as housing structures age to where sufficient carbonation occurs at reinforcing steel depths.
Corrosion control methods for structures made of steel-reinforced portland cement concrete. Causes of corrosion of the reinforcing steel and control methods.
There are several design factors that need to be considered when specifying coatings in water and wastewater concrete structures. Issues include treating surfaces with exposed aggregate, with a low pH, and exposed reinforcing steel. This paper will present three examples of important design considerations based on field experiences that can avert lining performance problems and impacts on a project schedule or budget. Specific examples from a number of projects will be used to illustrate these design considerations.