Overview
This project focuses on temporary corrosion protection of prestressed steel (TEKORS). Prestressed concrete is composed of high-strength concrete and high-strength steel. Because of the high strength of these two materials, the resulting structures use much less concrete and steel and are, therefore, more economical.
The objective of the research project is the implementation of the corrosion protection measures for pre-stressed steel into practice by means of organic protection layers. The excellent temporary effect of corrosion protection of the product Rust-Bun 310 as it was proved in laboratory tests should be transferred into practice. The priority questions here are the application as well as drying processes, which have to be optimised by the steel manufacturer using technological adjustments. In addition physical corrosion protection of anchor heads by flushing with dry air should be clarified on a suitable object.
Corrosion tests (climatic tests, pilot projects, Electrochemical processes), application techniques and film-drying processes.
Funding
Results
Foundations for implementation of the application of organic protective systems in prestressing steel producers.
This research project has shown that the organic corrosion protection with Rust Ban 310 emulsion exhibits the best behaviour concerning structural and climatic conditions. However, in the practice liquid oil films were observed on the prestressed steel after the exposition in the bridges. This appearance was not observed in the preliminary tests in the laboratory. Regarding the reduction of adhesive strength and the reduced corrosion protection, which was caused by a liquid oil film, solutions have to be found in order to transfer the excellent corrosion protection effect of the product into practice. Therefore, the operational sequences shall be optimised by the prestressing steel manufacturer concerning application and drying process of the product. Thereby the development of a practice-suited quality assurance concept is of special importance. Furthermore, the physical corrosion protection by flushing dried air to the jacked tube, should be clarified on additional objects.
Technical Implications
The research project is to implement the excellent temporary corrosive features of tendons by means of the organic protection system (Rust-Ban 310) into practice. Here, the corrosion attack is to prevent non-injected tension during construction. Procedural optimization of the application of Rust-Ban 310 should be the basis of further recommendations.