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Advances in Materials Science and Engineering
Volume 2018, Article ID 8585162, 11 pages
https://doi.org/10.1155/2018/8585162
Research Article

Stress Corrosion Behavior of Ungrouted Pretensioned Concrete Beams

1Corrosion and Materials Protection Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630003, Tamil Nadu, India
2Department of Architectural Engineering, Hanyang University, Erica Campus, Sangrok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea
3Department of Civil Engineering, Hannam University, Daejeon 34430, Republic of Korea

Correspondence should be addressed to Seung-Jun Kwon; rk.ca.mannah@89inujj

Received 18 September 2017; Revised 7 November 2017; Accepted 27 November 2017; Published 21 January 2018

Academic Editor: Michael J. Schütze

Copyright © 2018 Velu Saraswathy et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Prestressed concrete beams of size 150 × 150 × 1000 mm were designed, and two bonded cold-drawn 7 mm steel wires were stressed at 70% UTS under service conditions before concreting. The beams were cast with M40 grade concrete mix with various percentages of chlorides ranging from 0, 1, 2, and 3% by weight of cement and cured for 28 days. After 28 days, the stretching forces were released, the prestressing steel wire was allowed to regain its original length, the tensile stresses were transformed into a compressive stress in the concrete, and the stress corrosion behavior was assessed. Stress corrosion cracking (SCC) is due to the simultaneous action of stress, corrosive media, and material properties. The stress corrosion behavior of ungrouted pretensioned steel was assessed by using various electrochemical techniques such as electrochemical noise, open-circuit potential measurement, AC impedance, and potentiodynamic polarization measurements. The same experiments were conducted for rebars embedded in the concrete beam with various percentages of chlorides ranging from 0, 1, 2, and 3% by weight of chloride. After 30 days of exposure, the beams were tested for their flexural strength measurements to find out the load-bearing capacity.