Innovative Techniques for the Retrofitting of Corroded Reinforced Concrete Beams
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Volume Title: ICASGE2017
DOI: ICASGE-RCS
Authors
1Structural Engineering Department, Faculty of Engineering, Tanta University, Tanta, Egypt.
2Structural Engineering Department, Faculty of Engineering, Tanta University, Egypt
Abstract
This paper presents the results of an experimental study of the flexural behavior of corroded RC beams. The corrosion level was 10% and 15% as a mass loss of the reinforcing bars. Three specimens were conducted as a control: the first one was un-corroded beam and two were corroded with the aforementioned corrosion levels. The rest were retrofitted using different techniques: replacement of the deteriorated concrete at the tension side with a high-performance cementitious mortar layer, adding high-performance mortar at the compression zone, using external prestressing reinforcement at the tension zone, and a combination of them. The stress in the prestressing tendons was kept at a value of 0.25fpy and 0.38fpy. The results revealed that, the specimens retrofitted by a combination of an external prestressing bars and using highperformance cementitious layer at the tension zone showed a significant increase in capacity about 34% compared with the 10% mass loss corroded control specimens.
Keywords