Prediction of corrosion rate in reinforced concrete structures – a critical review and preliminary results

Abstract

This paper presents a critical review of some of the available corrosion rate prediction models focusing mainly on chloride‐induced corrosion. In addition to the proposals made for the improvement of these models, preliminary results of an ongoing study aimed at developing a chloride‐induced corrosion rate prediction model using both natural and accelerated corrosion results are presented. Even though a reasonable correlation between natural and accelerated icorr is presented here, more data are still required to ascertain the relationship.

Service-Life Assessment of Existing Precast Concrete Structure Exposed to Severe Marine Conditions

“…• Second, corrosion rate measurements are punctual measurements and can be affected by variability and many uncertainties, as pointed out by Otieno et al (Otieno et al, 2012). They reported differences between the results of three i corr assessment techniques (gravimetric, 3LP, and GECOR) larger than an order of magnitude.…”

“…These measurements were made at the outer side of the external walls using a GECOR 6 corrosimeter. The measured value of i corr was 4.40 μm/cm 2 , which indicated a high corrosion state (Otieno et al, 2012). This measurement was carefully considered in relation to the following:…”

An Entropy-Based Damage Characterization

“…Numerous models are available for corrosion damage prediction based on corrosion current density icorr. Otieno et al [88] present a review of available prediction models for reinforced concrete structures. The second group of models, in contrast, relies on the prediction of the service life of structures defined as the time to corrosion-induced damage such as cover cracking.…”

“…This requires real-time monitoring and advanced sensors that can be embedded within the structure during its service life. Due to the practical challenges associated with this technique, more focus has been placed on the prediction of corrosion-induced damage [88]. However, a comprehensive understanding of corrosion damage requires studying the thermodynamics of electrochemistry and irreversibility associated with icorr.…”

“…The corrosion current density icorr has been extensively used by researchers to model corrosion damage. Several corrosion damage models are available that rely on icorr as a measure of damage (see, for example, Otieno et al [88]). For example, Stern-Gary's model [90] is applicable to the linear regions of polarization in which slight changes in current applied to corroding metal in an ionic solution cause corresponding changes in the potential of metals.…”