Test methods for on-site corrosion rate measurement of steel reinforcement in concrete by means of the polarization resistance method

Revision as of 11:10, 22 May 2020

Abstract

This recommendation covers the description of non-destructive electrochemical test methods for the estimation in large size concrete structures of the instantaneous corrosion current densiti, Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): i_{corr} , expressed in Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): \mu A/cm^2 , by means of the so called Polarization Resistance technique, Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): R_p , in order to asses the condition of embedded steel reinforcement related to its corrosion. The values of Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): i_{corr} , can be used to assess the rate of degradation of concrete structures affected by reinforcement corrosión. However, the cannot give information on the actual loss in steel cross section which, at present, only can be assessed by means of direct visual observation. Values of the free corrosión potential or half-cell potential, Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): E_{corr}

[V], of the embedded reinforcing Steel and of the electrical concrete resistance, Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): R_e~~\Omega

, are obtained as preliminary steps of the Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): R_p

measurements. Values of the concrete resistivity, Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): \rho~~[\Omega m]

, can be calculated from Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): R_e

values providing the geometrical arrangement of the electrodes enables this calculation. Both parameters, Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): E_{corr}
and Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): R_e
(or Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): \rho

) may be used to complement the reliability of the Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): i_{corr}

measurements.

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+This recommendation covers the description of non-destructive electrochemical test methods for the estimation in large size concrete structures of the instantaneous corrosion current densiti, <math>i_{corr}</math>, expressed in <math>\mu A/cm^2</math>, by means of the so called Polarization Resistance technique, <math>R_p</math>, in order to asses the condition of embedded steel reinforcement related to its corrosion.
+The values of <math>i_{corr}</math>, can be used to assess the rate of degradation of concrete structures affected by reinforcement corrosión. However, the cannot give information on the actual loss in steel cross section which, at present, only can be assessed by means of direct visual observation.
+Values of the free corrosión potential or half-cell potential, <math>E_{corr}</math> [V], of the embedded reinforcing Steel and of the electrical concrete resistance, <math>R_e~~\Omega</math>, are obtained as preliminary steps of the <math>R_p</math> measurements. Values of the concrete resistivity, <math>\rho~~[\Omega m]</math>, can be calculated from <math>R_e</math> values providing the geometrical arrangement of the electrodes enables this calculation. Both parameters, <math>E_{corr}</math> and <math>R_e</math> (or <math>\rho</math>) may be used to complement the reliability of the <math>i_{corr}</math> measurements.
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