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Tolerance limit of chloride for steel in blended cement mortar using the cyclic polarisation technique

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Abstract

The tolerance limit for chloride in ordinary Portland cement (OPC) and blended cements such as Portland pozzolana cement (PPC) and Portland slag cement (PSC) was assessed by cyclic polarisation. This study covers both cement extracts and mortar. The salient features of this investigation were: in extracts, the tolerance limit for chloride actually doubles for PSC when compared to PPC and OPC. The tolerance limit for chloride for various mortars follows the order: PSC > PPC > OPC. In OPC and PPC mortar, the repassivation potential (E rep) shifted negatively with higher amounts of free chloride but in PSC mortar E rep shifted positively (+590 mV) even in the presence of 5,000 ppm of free chloride. PSC takes longer time (50 days) to reach E rep indicating perfect passivity maintained for the embedded steel.

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Abbreviations

OPC:

Ordinary Portland cement

PPC:

Portland pozzolana cement

PSC:

Portland slag cement

OCP:

Open circuit potential

TMT:

Thermomechanically treated

SCE:

Saturated calomel electrode

E rep :

Repassivation potential

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Acknowledgements

The authors thank the Director, CECRI, Karaikudi for kind permission to publish this article. The authors also gratefully acknowledge the support from a Center for Concrete Corea, South Korea for financial assistance.

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This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

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Authors and Affiliations

  1. School of Civil and Environmental Engineering, Yonsei University, Seoul, 120-749, Republic of Korea

    Ha-Won Song

  2. Corrosion Protection Division, Central Electrochemical Research Institute, Karaikudi, 630 006, Tamilnadu, India

    V. Saraswathy, S. Muralidharan & K. Thangavel

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  1. Ha-Won Song
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  2. V. Saraswathy
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  3. S. Muralidharan
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  4. K. Thangavel
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Correspondence to V. Saraswathy.

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Song, HW., Saraswathy, V., Muralidharan, S. et al. Tolerance limit of chloride for steel in blended cement mortar using the cyclic polarisation technique. J Appl Electrochem 38, 445–450 (2008). https://doi.org/10.1007/s10800-007-9457-3

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  • DOI: https://doi.org/10.1007/s10800-007-9457-3

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