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96326 PERFORMANCE OF PLAIN AND GALVANIZED REINFORCING STEEL DURING THE INITIATION STAGE OF CORROSION IN CONCRETE WITH POZZOLANIC ADDITIONS

Picture for 96326 PERFORMANCE OF PLAIN AND GALVANIZED
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Product Number: 51300-96326-SG
ISBN: 96326 1996 CP
Author: Rodney G. Powers, Eric I. Moreno, Alberto A. Sagues
Industry: Materials Selection and Design
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The pH of the concrete pore solution is expected to be somewhat lower in concretes using pozzolanic additions than in concrete using unblended cements. Variations in pH pore solution may hold the key to explaining conflicting reports on the performance of galvanized rebar. To examine that factor, plain and galvanized rebars have been tested for over two years in concrete specimens made with cement type II, with various contents of fly ash and silica fume. Electrochemical impedance measurements and sensitive polarization techniques have been used to measure the rate of metal dissolution in the absence of chloride contamination at two different levels of concrete moisture. The plain steel specimens have shown little tendency for passivation in two of the cement compositions widl the highest levels of pozzolanic addition. The galvanized steel passivated in all cases and showed apparent corrosion current densities of less than 0.3... Keywords: concrete, corrosion, fly ash, galvanized steel, polarizationresistance,reinforcing steel, silica fume.
The pH of the concrete pore solution is expected to be somewhat lower in concretes using pozzolanic additions than in concrete using unblended cements. Variations in pH pore solution may hold the key to explaining conflicting reports on the performance of galvanized rebar. To examine that factor, plain and galvanized rebars have been tested for over two years in concrete specimens made with cement type II, with various contents of fly ash and silica fume. Electrochemical impedance measurements and sensitive polarization techniques have been used to measure the rate of metal dissolution in the absence of chloride contamination at two different levels of concrete moisture. The plain steel specimens have shown little tendency for passivation in two of the cement compositions widl the highest levels of pozzolanic addition. The galvanized steel passivated in all cases and showed apparent corrosion current densities of less than 0.3... Keywords: concrete, corrosion, fly ash, galvanized steel, polarizationresistance,reinforcing steel, silica fume.
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