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Electrochemical study on inhibitors of rebar corrosion in carbonated concrete

Trabanelli, G. / Monticelli, C. / Grassi, V. / Frignani, A.

AbstractElectrochemical Impedance Spectroscopy (EIS) was used to evaluate the inhibitive action of some organic compounds towards the corrosion of a carbon steel, both in a solution simulating the pore chemistry of carbonated concrete and in carbonated concrete.The synthetic solution (SS) has been made by bubbling pure CO2 in a saturated Ca(OH)2 solution till obtaining pH 7 and then filtering it. Concrete carbonation has been obtained by maintaining the concrete specimens in CO2 atmosphere for 80 days, at 68% RH and room temperature.In SS, benzoate, its amino-derivatives and dicarboxylates were able to form a long-lasting passive layer on the steel surface. Their efficiency improved with time.In carbonated concrete the additives inducing a decrease in the concrete compressive strength were discarded. Some compounds were monitored for up to 400 days, but only two (the sodium salts of benzoic acid and, particularly, 2-amino benzoic acid) exhibited some inhibitive effect towards the rebar corrosion process.

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Electrochemical study on inhibitors of rebar corrosion in carbonated concrete

Trabanelli, G. / Monticelli, C. / Grassi, V. / Frignani, A.

AbstractElectrochemical Impedance Spectroscopy (EIS) was used to evaluate the inhibitive action of some organic compounds towards the corrosion of a carbon steel, both in a solution simulating the pore chemistry of carbonated concrete and in carbonated concrete.The synthetic solution (SS) has been made by bubbling pure CO2 in a saturated Ca(OH)2 solution till obtaining pH 7 and then filtering it. Concrete carbonation has been obtained by maintaining the concrete specimens in CO2 atmosphere for 80 days, at 68% RH and room temperature.In SS, benzoate, its amino-derivatives and dicarboxylates were able to form a long-lasting passive layer on the steel surface. Their efficiency improved with time.In carbonated concrete the additives inducing a decrease in the concrete compressive strength were discarded. Some compounds were monitored for up to 400 days, but only two (the sodium salts of benzoic acid and, particularly, 2-amino benzoic acid) exhibited some inhibitive effect towards the rebar corrosion process.

Electrochemical study on inhibitors of rebar corrosion in carbonated concrete

Trabanelli, G. / Monticelli, C. / Grassi, V. / Frignani, A.

AbstractElectrochemical Impedance Spectroscopy (EIS) was used to evaluate the inhibitive action of some organic compounds towards the corrosion of a carbon steel, both in a solution simulating the pore chemistry of carbonated concrete and in carbonated concrete.The synthetic solution (SS) has been made by bubbling pure CO2 in a saturated Ca(OH)2 solution till obtaining pH 7 and then filtering it. Concrete carbonation has been obtained by maintaining the concrete specimens in CO2 atmosphere for 80 days, at 68% RH and room temperature.In SS, benzoate, its amino-derivatives and dicarboxylates were able to form a long-lasting passive layer on the steel surface. Their efficiency improved with time.In carbonated concrete the additives inducing a decrease in the concrete compressive strength were discarded. Some compounds were monitored for up to 400 days, but only two (the sodium salts of benzoic acid and, particularly, 2-amino benzoic acid) exhibited some inhibitive effect towards the rebar corrosion process.

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Title:

Electrochemical study on inhibitors of rebar corrosion in carbonated concrete

Contributors:

Trabanelli, G. (author) / Monticelli, C. (author) / Grassi, V. (author) / Frignani, A. (author)

Published in:

Cement and Concrete Research ; 35 ; 1804-1813

Publication date:

2004-12-07

Size:

10 pages

ISSN:

DOI:

https://doi.org/10.1016/j.cemconres.2004.12.010

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

C. Carbonation , C. Corrosion , D. Admixture , Benzoate derivative , Electrochemical impedance spectroscopy

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