An Embedded-Sensor Approach for Concrete Resistivity Measurement in On-Site Corrosion Monitoring: Cell Constants Determination

Abstract

The concrete electrical resistivity is a prominent parameter in structural health monitoring, since, along with corrosion potential, it provides relevant qualitative diagnosis of the reinforcement corrosion. This study proposes a simple expression to reliable determine resistivity from the concrete electrical resistance (RE) provided by the corrosion sensor of the Integrated Network of Sensors for Smart Corrosion Monitoring (INESSCOM) we have developed. The novelty here is that distinct from common resistivity sensors, the cell constants obtained by the proposed expression are intended to be valid for any sensor implementation scenario. This was ensured by studying most significant geometrical features of the sensor in a wide set of calibration solutions. This embedded-sensor approach is intended to be applicable for RE measurements obtained both using potential step voltammetry (PSV, used in the INESSCOM sensor for corrosion rate measurement) and alternating current methods. In this regard, we present a simple protocol to reliably determine RE, and therefore resistivity, from PSV measurements. It consists in adding a very short potentiostatic pulse to the original technique. In this way, we are able to easy monitor resistivity along with corrosion rate through a single sensor, an advantage which is not usual in structural health monitoring.

Core–shell-structured and hydrogen-evolution-suppressing zinc anode for high stability Zn–Ni secondary batteries

“…4d). The corrosion potential and corrosion current density obtained from linear partial extrapolation of the cathode Tafel region are listed in Table S4 † 45 . The reactions of cathode, hydrogen evolution and self-corrosion are shown in eqn (8), (9), and (10), respectively.Zn(OH) 4 2− + 2e − → Zn + 4OH − 2H 2 O + 2e − → H 2 ↑ + 2OH − Zn + 2OH − + 2H 2 O → Zn(OH) 4 2− + H 2 ↑…”

Effect of macrocell currents on rebar corrosion in reinforced concrete structures exposed to a marine environment

“…In recent years, much progress has been made in developing embedded sensors capable of detecting the depassivation of reinforcement (Andrade, 2020;Daniyal and Akhtar, 2020;Rodrigues et al, 2021), and of measuring the electrochemical potential of adjacent rebars (Karthick et al, 2018; or the resistivity of concrete cover (Ramón et al, 2021). Other authors have designed sensors to determine the presence of chlorides or concrete carbonation (Gandía-Romero et al, 2016a;2016b;Ramani and Kuang, 2020), as well as to quantify other corrosion kinetic-related parameters; for example, humidity or oxygen concentration (Martínez-Ibernón et al, 2021).…”

Improved Tafel-Based Potentiostatic Approach for Corrosion Rate Monitoring of Reinforcing Steel

“…5b), where i 0 is the current recorded at the outset (t 0) and i LIM the current measured upon conclusion. As demonstrated in a recent paper [54], the most reliable way to record i 0 is to use very short pulses ( t 5 ms) with short sampling time (0.1 ms). However, as discussed in [39] to reliably determine i LIM the quasi-steady state system response ( t 50 s) must be recorded.…”