engleski

Corrosion of Prestressing Steel in High Performance Grouts

In past few decades inspections of prestressed structures have shown that corrosion is one of the main reasons for deterioration of prestressed structures. Grout is the last but most important corrosion protection layer in prestressed structures and with adequate materials, good design and high-quality installation of grout it is possible to minimize the risk of corrosion. The main role of grout is to fill the voids between protective duct and prestressing strand and to suppress the flow of water and chloride ions. To determine the effectiveness of corrosion protection system, serious of specimens for accelerated corrosion tests were produced from high performance grouts with embedded prestressing steel bars. The corrosion of prestressing steel in grout specimens was evaluated by impressing potential for acceleration of corrosion. The effectiveness of the inhibitors and admixtures added to grout was evaluated by measuring corrosion potentials, current vs. time and time-to-cracking of the grout specimens.

Corrosion; Prestressing Steel; Prestressed Concrete; Inhibitor

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