A prediction model for the residual flexural strength of corroded reinforced concrete beams

(2005) A prediction model for the residual flexural strength of corroded reinforced concrete beams. Masters thesis, King Fahd University of Petroleum and Minerals.


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Corrosion of reinforcing steel and subsequent concrete deterioration is a major problem faced by the construction industry. However, limited work is available for the estimation of the flexural strength of corrosion-damaged members. In the present work, an effort has been made to develop a model to predict the residual flexural strength of reinforced concrete beams with varying degree of reinforcement corrosion. The experimental variables included: applied corrosion current density, corrosion duration, rebar diameter and thickness of concrete cover. A total of 56 reinforced concrete beams (150 x 150 x 1100 mm) were cast using a common concrete mix, out of which 8 beams were earmarked as control beams that were not subjected to corrosion and the remaining 48 beams were subjected to corrosion by impressed current. All beams were tested in flexure in four-point bend tests. After testing in flexure the beams were broken to retrieve the reinforcing steel. The steel bars were cleaned to assess the gravimetric weight loss. Results indicate that the product of corrosion current density and corrosion period IcorrT, is the most significant factor affecting the flexural strength of a corroded beam. Diameter of steel bars also affected the extent of metal loss for identical IcorrT. The effect of cover thickness on the loss flexural strength was found to be insignificant for a given beam at constant Icorr T. Based on the experimental data, a two-step approach to predict the residual flexural strength of a corroded beam has been proposed. The usefulness of the proposed approach for prediction of the residual strength of the corroded beams for which information on corrosion current density, corrosion period, beam cross-section, and strength of materials are available has been illustrated through numerical examples. The accuracy of the proposed method has been verified by comparing the results with the test data available in the literature.

Item Type: Thesis (Masters)
Subjects: Civil Engineering
Department: College of Design and Built Environment > Civil and Environmental Engineering
Committee Advisor: Azad, Abul Kalam
Committee Members: Al-Gahtani, Ahmad S. and Maslehuddin, Mohammed M. and Al-Zahrani, Mesfer M. and Ahmad, Shamsad
Depositing User: Mr. Admin Admin
Date Deposited: 22 Jun 2008 13:48
Last Modified: 01 Nov 2019 13:50
URI: http://eprints.kfupm.edu.sa/id/eprint/9765