Screen-printed electrode as a cost-effective and miniaturized analytical tool for corrosion monitoring of re-inforced concrete

Herein, we report the first electrochemical sensor based on a screen-printed electrode designed to evaluate the corrosion level in iron-reinforced concrete specimens. The combination of an Ag pseudoreference electrode with a gel polymeric electrolyte allows for fast, stable and cost-effective potentiometric measurements, suitable for evaluating the corrosion of iron bars embedded in concrete samples. The sensor was found to be capable of discriminating between a standard non-corroded sample and samples subject to corrosion due to the presence of chloride or carbonate in the concrete matrix. The potential in concrete-based specimens containing carbonate (pH 9, - 0.35 +/- 0.03 V) or chloride (4% w/w, - 0.52 +/- 0.01 V) was found to be more negative than in a standard concrete-based sample ( - 0.251 +/- 0.003 V), in agreement with the ASTM standard C876 method which uses a classical Cu/CuSO4 solid reference electrode. Our results demonstrate that a printed Ag pseudoreference electrode combined with KC1 agar provides an efficient and reliable electrochemical system for evaluating the corrosion of iron bars embedded in concrete-based structures.

Colozza, Noemi (author)
Papa, Elena (author)
Hermansson, Kersti,ProfessorUppsala universitet,Strukturkemi(Swepub:uu)kerstihs (author)
Cacciotti, Ilaria (author)
Arduini, Fabiana (author)
Uppsala universitetStrukturkemi (creator_code:org_t)

By the author/editor: Sassolini, Aless ...; Colozza, Noemi; Papa, Elena; Hermansson, Kers ...; Cacciotti, Ilari ...; Arduini, Fabiana

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