Effect of Cement Type on the Corrosion of Reinforcing Steel Bars Exposed to Acidic Media Using Electrochemical Techniques

Various measurement techniques were used to examine the effect of different percentages of cement components (tricalcium aluminate C3A) on the corrosion of embedded reinforcing steel bars in the presence of 5% NaCl or 5% MgSO4 solutions. The electrochemical measurement techniques used were half-cell potential measurement, the impressed voltage method, and the impressed current method. The presence of C3A in cement greatly reduced the corrosion of steel bars embedded in concrete subjected to chloride or sulphate solutions. In a chloride solution, corrosion decreased proportionally as the percent of C3A in cement increased from 2% to 10%. In an MgSO4 solution the rate of corrosion decreased as the percent of C3A increased from 2% to 6%. From 6% to 10% the steel corrosion rate increased rapidly. The presence of chloride and sulfate solutions in cement generally reduced the destructive effect of sulphate ions on embedded steel bars.

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  • English

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  • Accession Number: 01007079
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 8 2005 11:32AM