Corrosion prevention of rebar in concrete due to chloride

Authors

  • Yuttana Srimahajariyaphong The Sirindhorn International Thai-German Graduate School of Engineering (TGGS), King Mongkut’s University of Technology North Bangkok
  • Satian Niltawach The Sirindhorn International Thai-German Graduate School of Engineering (TGGS), King Mongkut’s University of Technology North Bangkok

Keywords:

Rebar, Chloride induced corrosion, Pozzolan, Calcium Nitrite, Half cell potential measurement

Abstract

In coastal and brackish areas, black rebar in concrete structures suffers from chloride corrosion which leads to spalling of the concrete. The “Half Cell Potential Measurement” technique has been applied to study the corrosion behavior of both black and galvanized deformed rebar in different concretes. Additives in the concretes vary from pozzolan, calcium nitrite, to pozzolan plus calcium nitrite. Rebar which has higher half cell potential possesses better corrosion resistance. It has been found that concrete cover thickness has no significant effect on the half cell potential of either rebar; that for both types of rebar, the half cell potential is highest in concrete coming from cement + fly ash, and finally, that the half cell potential of galvanized rebar is lower than that of black rebar because zinc has lower electro-chemical potential at -763 mV than steel at -440 mV.

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References

Prarom, P., Wanaratwijit, W., Sancharoen, P., Pansuk, W. & Tangtermsirikul, S. (2010). Effect of chloride content and mix proportion on effectiveness of corrosion inhibitor to prevent corrosion of reinforcing steel. In: Proceedings of the 15th national convention on civil engineering. May 12-14, Ubonratchathani, Thailand, Ubon Ratchathani. (In Thai)

Concrete and Materials Committee. (2000). Durability of concrete. Engineering Institute of Thailand: 30. (In Thai)

Rakumthong, T (2004). Effect of calcium nitrite to prevent corrosion of reinforcing steel in concrete due to chloride. In: Proceedings of the 2nd CPAC convention on concrete technology. June 30 – July 1, Rayong, Thailand. (In Thai)

Emmons, P.H. (1992) (Translated by Suebsak Promboon, 2008). Concrete repair and maintenance illustrated: Problem analysis, repair strategy, techniques. Bangkok: SCG Cement: 8-14, 82-83, 245-251. (In Thai)

ASTM C876-09 (2000). Standard Test Method for Half-Cell Potentials of Uncoated Reinforcing Steel in Concrete.

Concrete and Materials Committee. (1997). Standards for construction materials and concrete structures. Engineering Institute of Thailand: 4, 22-24. (In Thai)

Gu, P. & Beaudoin, J.J. (1998). Obtaining Effective Half-cell Potential Measurements in Reinforced Concrete Structure. Construction Technology Updates (18): 1-4.

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Published

2011-06-30

How to Cite

[1]
Y. Srimahajariyaphong and S. Niltawach, “Corrosion prevention of rebar in concrete due to chloride”, J Met Mater Miner, vol. 21, no. 1, Jun. 2011.

Issue

Vol. 21 No. 1 (2011)

Section

Original Research Articles

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