Electrochemical behaviour of an austenitic stainless steel reinforced concrete in the presence of starch and cellulose admixtures

B. D. Ikotun, A. S. Afolabi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The electrochemical behaviour of an austenitic stainless steel embedded in concrete containing various proportions (5%, 10%, 15%, 20% and 25%) of starch and cellulose admixtures in contact with one molar solution of sodium chloride was studied. The electrode potential measurements were determined using a digital voltmeter with zinc rod reference electrode. Surface passivation was observed at 10-20% starch content, while 5-10% cellulose admixture was required to enhance surface passivation of the reinforced austenitic stainless steel. The synergetic effect of the two admixtures occurred at 5% starch and 15% cellulose, and produced good film stability. These deductions were attributed to the alteration in the composition of the concrete medium, which was brought about by the replacement of hydroxyl group in the structures of the admixtures by the aggressive chloride ions. There was an excess hydroxyl group released into the concrete medium, which created an excess alkaline and passivating environment for the reinforcing austenitic stainless steel (ASS) within the concrete.

Original languageEnglish
Pages (from-to)22-28
Number of pages7
JournalConstruction and Building Materials
Volume42
DOIs
Publication statusPublished - Feb 18 2013

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Austenitic stainless steel
Starch
Cellulose
Reinforced concrete
Concretes
Passivation
Hydroxyl Radical
Digital voltmeters
Electrodes
Sodium chloride
Sodium Chloride
Contacts (fluid mechanics)
Zinc
Chlorides
Ions
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

Cite this

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abstract = "The electrochemical behaviour of an austenitic stainless steel embedded in concrete containing various proportions (5{\%}, 10{\%}, 15{\%}, 20{\%} and 25{\%}) of starch and cellulose admixtures in contact with one molar solution of sodium chloride was studied. The electrode potential measurements were determined using a digital voltmeter with zinc rod reference electrode. Surface passivation was observed at 10-20{\%} starch content, while 5-10{\%} cellulose admixture was required to enhance surface passivation of the reinforced austenitic stainless steel. The synergetic effect of the two admixtures occurred at 5{\%} starch and 15{\%} cellulose, and produced good film stability. These deductions were attributed to the alteration in the composition of the concrete medium, which was brought about by the replacement of hydroxyl group in the structures of the admixtures by the aggressive chloride ions. There was an excess hydroxyl group released into the concrete medium, which created an excess alkaline and passivating environment for the reinforcing austenitic stainless steel (ASS) within the concrete.",
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Electrochemical behaviour of an austenitic stainless steel reinforced concrete in the presence of starch and cellulose admixtures. / Ikotun, B. D.; Afolabi, A. S.

In: Construction and Building Materials, Vol. 42, 18.02.2013, p. 22-28.

Research output: Contribution to journalArticle

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AB - The electrochemical behaviour of an austenitic stainless steel embedded in concrete containing various proportions (5%, 10%, 15%, 20% and 25%) of starch and cellulose admixtures in contact with one molar solution of sodium chloride was studied. The electrode potential measurements were determined using a digital voltmeter with zinc rod reference electrode. Surface passivation was observed at 10-20% starch content, while 5-10% cellulose admixture was required to enhance surface passivation of the reinforced austenitic stainless steel. The synergetic effect of the two admixtures occurred at 5% starch and 15% cellulose, and produced good film stability. These deductions were attributed to the alteration in the composition of the concrete medium, which was brought about by the replacement of hydroxyl group in the structures of the admixtures by the aggressive chloride ions. There was an excess hydroxyl group released into the concrete medium, which created an excess alkaline and passivating environment for the reinforcing austenitic stainless steel (ASS) within the concrete.

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