Evaluation of organic based corrosion inhibiting admixtures for reinforced concrete
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
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| Title |
Evaluation of organic based corrosion inhibiting admixtures for reinforced concrete
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| Creator |
Vishnudevan, M.
Thangavel, K. |
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| Subject |
Corrosion Science and Engineering
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| Description |
Purpose - Admixtures are materials that are added to concrete at some stage in its production to give concrete new properties whether in fluid or
plastic conditions. The admixtures used in the construction industry are broadly classified into Mineral and Chemical admixtures. In recent years, the use
of mineral and chemical admixtures in producing high performance concrete has increased significantly. The chemical reaction of cement with
admixtures differs from material to material. Calcium nitrite based corrosion inhibiting admixtures have gained popularity for protection of reinforced
and pre-stressed concrete structures but calcium nitrite is not commercialized indigenously in lndia due to manufacturing difficulties. Hence, the
objective of the present investigation was to study a novel corrosion inhibiting admixture system and to compare its effectiveness with sodium nitrite.
Designlmethodologylapproach - Di-sodium phthalate, sodium orthophosphate and sodium nitrite-based corrosion inhibiting admixtures were
selected for the present investigation. The critical quantities of corrosion inhibiting additives were determined by accelerated laboratory tests. The
following types of tests were conducted to evaluate the efficiency of the corrosion inhibiting admixtures: compressive strength of
100 x 100 x 100mm concrete cubes after 3,7,14 and 28 days of curing, linear polarization resistance measurements, electrochemical impedance
spectroscopy measurements, an accelerated 12 V controlled potential test.
Findings - From the above tests, the inhibitor admixtured concrete not only improved in compressive strength but also increased its corrosion
resistance properties. Of the inhibitors studied, di-sodium phthalate showed superior corrosion resistance properties, compared to sodium nitrite.
Originalitylvalue - Di-sodium phthalate may be considered a better substitute for calcium nitrite-based corrosion inhibiting admixtures for durable
concrete structures. This fulfils the objective of the investigation.
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| Publisher |
Emerald
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| Date |
2006
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cecri.csircentral.net/523/1/005-2006.pdf
Vishnudevan, M. and Thangavel, K. (2006) Evaluation of organic based corrosion inhibiting admixtures for reinforced concrete. Anti-Corrosion Methods and Materials , 53 (5). pp. 271-276. ISSN 0003-5599 |
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| Relation |
http://cecri.csircentral.net/523/
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