Electrochemical Study on Inhibitors of Rebar Corrosion in Carbonated Concrete

This paper presents a study in which electrochemical impedance spectroscopy (EIS) was used to examine the inhibitive action of some organic compounds towards the corrosion of carbon steel. The study examined the reactions in a solution that simulates the pore chemistry of carbonate concrete and in the carbonated concrete itself. The synthetic solution was made by bubbling pure CO2 in a saturated Ca(OH)2 solution until it achieved pH 7, then filtering it. Concrete carbonation was obtained by keeping concrete specimens in a pure CO2 atmosphere for 80 days at 68% relative humidity and room temperature. In the synthetic solution benzoate, its amino-derivatives and dicarboxylates formed a long-lasting layer on the steel surface. Their efficiency improved with time. In the carbonated concrete the additives causing a decrease in the concrete compressive strength were discarded. Samples were monitored for up to 400 days but only two samples showed inhibition of the rebar corrosion process.

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  • Authors:
    • Trabanelli, G
    • Monticelli, C
    • Grassi, V
    • Frignani, A
  • Publication Date: 2005-9

Language

  • English

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Filing Info

  • Accession Number: 01007076
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 3 2005 1:21PM