American Society of Civil Engineers


Experimental Study on Bending Behavior of Corroded Post-Tensioned Concrete Beams


by Y. H. Zeng, (Department of Building Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China E-mail: yanhongzeng@gmail.com), Q. H. Huang, (Department of Building Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China E-mail: hqh@tongji.edu.cn), X. L. Gu, (Department of Building Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China E-mail: gxl@tongji.edu.cn), and W. P. Zhang, (Department of Building Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China E-mail: Weiping_zh@tongji.edu.cn)
Section: Symposium 13: Advanced Construction Materials, pp. 3521-3528, (doi:  http://dx.doi.org/10.1061/41096(366)336)

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Document type: Conference Proceeding Paper
Part of: Earth and Space 2010: Engineering, Science, Construction, and Operations in Challenging Environments
Abstract: Nine post-tensioned concrete (PC) beams were made and corroded by impressing direct current to them. The influences of different factors, such as the corrosion ratio of prestressing tendons, grouting condition etc., were taken into consideration. The failure modes and mechanism of corroded PC beams were investigated by monotonic loading tests. The experimental results showed that the higher the corrosion ratio of prestressing tendons is the lower the cracking, yielding and ultimate capacities of the PC beams will be. With the development of the corrosion of prestressing tendons, the characteristics of load-deflection curves of PC beams are no longer similar with that of uncorroded PC beams, but turn into that of reinforced concrete beams. The prestressing tendons will be easier to corrode for a beam with bad grouting condition, and the corrosion will lead to severe deterioration of the bond strength between concrete and prestressing tendons that will greatly reduce the stiffness of the beam.


ASCE Subject Headings:
Experimentation
Bending
Corrosion
Concrete beams
Stiffness