07307 ASSESSMENT, SELECTION, AND SPECIFICATION OF CATHODIC PROTECTION MEASURES IN REINFORCED CONCRE

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Product Number: 51300-07307-SG

ISBN: 07307 2007 CP

Author: Mehrooz Zamanzadeh, George T. Bayer, Kevin Groll, Shawn McArdle, and John Parks

Publication Date: 2007

Industry: Materials Selection and Design

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A proven methodology for providing assessment, selection and specification of cathodic protection measures in reinforced concrete infrastructures and historic buildings is described. An on-site condition evaluation survey is first required. Evaluation and survey will consist of implementation of several analysis techniques including visual examination to detect defects, petrography to determine concrete condition, and various electrochemical measurements such as half cell potential mapping, linear polarization, continuity, stray current identification and resistivity. Laboratory analysis of petrographic and corrosion product samples should be conducted by an experienced petrographic specialist. Petrographic evaluation will determine aggregate type and size, depth of carbonation, air void content and mode of deterioration if present. These will determine integrity of concrete and the best means of rehabilitation and corrosion protection. Based on the above work, determination of extent of damage and remaining service life are made. Critical questions to be answered are is the reinforced concrete infrastructure sound, and does it require repair or replacement? Consideration is given to materials selection for repair and/or replacement of the structural components.