Corrosion Testing of Grout for Posttensioning Ducts and Stay Cables
Publication: Journal of Structural Engineering
Volume 126, Issue 2
Abstract
Grout mixes using commercially available antibleed admixtures were tested for fresh properties and subsequently corrosion tested using anodic polarization to accelerate the corrosion process. Commercial admixtures that are intended to improve the corrosion protection provided by the grout were also tested in grout mixes containing the antibleed admixture. From a comparison, it was found that the antibleed admixture reduced the corrosion protection of the grout and a mix with no antibleed admixture did not. It was also found that one corrosion protection admixture improved protection while the other admixture reduced protection provided by the grout. Because the accelerated tests were conducted at an artificially high potential of 600 mV, there is some concern that the polarization level at the strand will differ significantly among grouts with varying ohmic resistances. Potentiodynamic tests were conducted on selected specimens, to investigate this effect, and were inconclusive. Further study into this effect is recommended before the higher polarization levels are used to evaluate grouts that having varying ohmic resistances.
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References
1.
Berke, N. S., Shen, D. F., and Sundberg, K. M. ( 1990). “Comparison of current interruption and electrochemical impedance techniques in the determination of corrosion rates of steel in concrete.” The measurement and correction of electrolyte resistance in electrochemical tests. ASTM STP 1056, L. L. Scribner and S. R. Taylor, eds., American Society for Testing and Materials, Philadelphia, 191–201.
2.
Hack, H. P., Moran, P. J., and Scully, J. R. ( 1990). “Influence of electrolyte resistance on electrochemical measurements and procedures to minimize or compensate for resistance errors.” The measurement and correction of electrolyte resistance in electrochemical tests, ASTM STP 1056, L. L. Scribner and S. R. Taylor, eds., American Society for Testing and Materials, Philadelphia, 5–26.
3.
Hamilton III, H. R. ( 1995). “Investigation of corrosion protection systems for bridge stay cables,” PhD dissertation, University of Texas at Austin, Austin, Tex., 484.
4.
Hamilton III, H. R., Breen, J. E., and Frank, K. H. (1998). “Bridge stay cable corrosion protection. I: Grout injection and load testing.”J. Bridge Engrg., ASCE, 3(2), 64–71.
5.
Hamilton III, H. R., Breen, J. E., and Frank, K. H. (1998). “Bridge stay cable corrosion protection. II: Accelerated corrosion testing.”J. Bridge Engrg., ASCE, 3(2), 72–81.
6.
Hope, B. B., and Ip, A. K. (1988). “Grout for post-tensioning ducts.” ACI Mat. J., 84(4), 234–240.
7.
Schiessl, P. (1988). “Corrosion of steel in concrete.” Rep. of Tech. Com. 60-CSC RILEM, Chapman and Hall, New York.
8.
Thompson, N. G., Lankard, D., and Sprinkel, M. (1992). “Improved grouts for bonded tendons in post-tensioned bridge structures.” Rep. No. FWHA-RD-91-092, Federal Highway Administration, Washington, D.C.
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Information
Published In
Journal of Structural Engineering
Volume 126 • Issue 2 • February 2000
Pages: 163 - 170
History
Received: May 26, 1999
Published online: Feb 1, 2000
Published in print: Feb 2000
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