Guard Ring and Electrochemical Noise Employment in the Evaluation of the Steel-Concrete System

Abstract

To evaluate the electrochemical parameters of the reinforced concrete specimens at laboratory level there is no problem at all, because one can use any well-known electrochemical technique, but in site monitoring, there are few techniques being able to obtain these parameters. In this work a viable alternative is presented for the electrochemical evaluation of the reinforced concrete specimens in laboratory or in site monitoring. In order to have a reference of the corrosion rate obtained with the electrochemical noise technique and to be able to establish if these are real ones, measurements with commercial equipment were made applying the polarization resistance technique.Keywords: corrosion, electrochemical noise, polarization resistance, armed concrete, monitoring. IntroducciónEn la industria de la construcción, el hormigón armado con barras de acero es el material más empleado en todo el mundo, debido a su facilidad para moldearse y formar cualquier estructura geométrica, la corrosión del acero de refuerzo tiene una elevada frecuencia con que ocurre, por lo que puede decirse que la corrosión del acero del armado es una de las principales causas de que las estructuras de hormigón armado sufran deterioro prematuro.

Electrochemical Performance of Phyllanthus Muellerianus on the Corrosion of Concrete Steel-reinforcement in Industrial/Microbial Simulating-environment

“…1(b). Also, linear plots for directly interpreting corrosion risk as per ASTM C876-91 R99 [26][27][28] were included in Fig. 1(a), following the practice in Zamora et al [5], and linear plot for directly interpreting corrosion rate, as classified in studies [41][42], was included in Fig.…”

“…Measurements of corrosion test-data were obtained from the concrete samples first, in five days interval for 40 days and thereafter in seven days interval for the following four weeks (totalling 68-day experimental period), through use of electrochemical test-techniques [26][27]. The electrochemical test-techniques employed in the study include:…”

“…Noise resistance (R n ) modelling Requisite estimations, from the descriptive statistics exhibiting better compatibility with the scatter of the HCP and the ECC test-data were used for the ratio of the standard deviations of the corrosion potential and corrosion current, the noise resistance (R n ) as [26][27]31,[38][39]:…”

“…(1) Half-cell potential (HCP) measurements versus Cu/CuSO 4 electrode (CSE), Model 8-A, Tinker & Rasor®, using a high impedance digital multimeter conforming to ASTM C876-91 R99 [5,13,[27][28]. (2) Electrochemical cell current (ECC) measurements, versus CSE using zero resistance ammeter (ZRA), Model ZM3P (Corrosion Service®) [29][30][31].…”