Linear Polarization Resistance Tests on Corrosion Protection Degree of Post-Tensioning Grouts

2011 ◽  
Vol 108 (4) ◽  
Keyword(s):  
Corrosion Protection ◽  
Linear Polarization ◽  
Polarization Resistance ◽  
Linear Polarization Resistance ◽  
Post Tensioning ◽  
Resistance Tests

Error Estimation of Linear Polarization Resistance Measurement Caused by IR Drop for Reinforcement Corrosion in Concrete

2016 ◽  
Vol 866 ◽  
pp. 14-19
Author(s):  
Jin Xia Xu ◽  
Ya Long Cao ◽  
Lin Hua Jiang ◽  
Ying Bin Song ◽  
Wei Feng
Keyword(s):  
Linear Polarization ◽  
Polarization Resistance ◽  
Chloride Content ◽  
Chloride Ions ◽  
Resistance Measurement ◽  
Reinforcing Steel ◽  
Error Level ◽  
Corrosion Condition ◽  
Linear Polarization Resistance ◽  
Ir Drop

In order to evaluate more accurately the corrosion condition of reinforcing steel in chloride contaminated concrete, it is significant to investigate the error level in the linear polarization resistance measurement caused by IR drop. Concretes with eight levels of chloride ions (ranging from 0% to 2.0% by mass of cement) by adding different amounts of sodium chloride in the mixing water were prepared. Linear polarization measurements with and without IR compensation, were applied to determine the error level. Besides, half-cell potential method was employed to detect the corrosion condition of reinforcing steel. The results indicate that the error level is so low (less than 5.0%) that the IR drop can be negligible when the chloride content is relatively lower (0.6% or less by mass of cement). However, the error level is increased with the increase of chloride content. The IR drop is suggested to be compensated when the chloride content is relatively higher (more than 0.6% by mass of cement). At this time, the onset of active corrosion of reinforcing steel is also found.

A Lifetime of Metallic Nanoparticles in Heat Exchange Liquids

2014 ◽  
Vol 811 ◽  
pp. 23-27 ◽  
Author(s):  
Jan Stoulil ◽  
Tomáš Pfeifer ◽  
Alena Michalcová ◽  
Ivo Marek
Keyword(s):  
Aqueous Solution ◽  
Heat Exchange ◽  
Mass Loss ◽  
Linear Polarization ◽  
Polarization Resistance ◽  
Metallic Nanoparticles ◽  
Iron Nanoparticles ◽  
Corrosion Prevention ◽  
Linear Polarization Resistance ◽  
Formate Solution

This work is focused on lifetime prediction of metallic nanoparticles in heat exchange nanofluids. Copper, nickel and iron nanoparticles were studied in 40 wt.% aqueous solution of potassium formate and propylene glycol. Materials were observed by means of mass loss exposure tests, linear polarization resistance and potentiodynamic measurements. Potassium formate solution is not suitable bearing liquid for metallic nanoparticles. Propylyne glycol seems promising, however additional corrosion prevention needs to be applied.

Improvement of the linear polarization resistance method for testing steel corrosion inhibitors

2016 ◽  
Vol 2016 (11) ◽  
pp. 1035-1041 ◽  
Author(s):  
A. T. Faritov ◽  
Yu. G. Rozhdestvenskii ◽  
S. A. Yamshchikova ◽  
E. R. Minnikhanova ◽  
A. S. Tyusenkov
Keyword(s):  
Linear Polarization ◽  
Polarization Resistance ◽  
Corrosion Inhibitors ◽  
Steel Corrosion ◽  
Resistance Method ◽  
Linear Polarization Resistance ◽  
Polarization Resistance Method

scholarly journals Monitoring DIAMOND device for corrosion state evaluation of reinforced concrete structures

2018 ◽  
Vol 199 ◽  
pp. 04007 ◽  
Author(s):  
Gabriel Samson ◽  
Fabrice Deby ◽  
Jean-Luc Garciaz ◽  
Jean-Louis Perrin
Keyword(s):  
Reinforced Concrete ◽  
Linear Polarization ◽  
Concrete Structure ◽  
Polarization Resistance ◽  
Reinforced Concrete Structure ◽  
Linear Polarization Resistance ◽  
Corrosion Evaluation ◽  
Ohmic Drop ◽  
Concrete Resistivity ◽  
Corrosion State

The corrosion of steel rebars is a major issue with respect to the durability of reinforced concrete structure. Several corrosion evaluation methods exist: half-cell potential, concrete resistivity or linear polarization resistance (LPR) measurement. However, these techniques are employed at a given moment and are not suitable for continuous corrosion evaluation. This works belongs to the DIAMOND project which aims to produce a new corrosion state measurement monitoring device. The monitoring probe consists on a cylindrical probe. A ring shape counter-electrode CE is plated on the probe side. At the centre of the CE, a reference electrode (RE) is placed for potential measurement. The device is embedded in concrete at 25 mm of the inspected rebar. The instantaneous ohmic drop observed at the beginning of the polarization measurement is only linked with the concrete resistance which depends on concrete cover and resistivity. A numerical model was developed on Comsol® to create abacuses graph that link concrete resistivity and concrete resistance. Thus, the ohmic drop measure at the beginning of the polarization can now be used to determine regularly concrete average resistivity between the monitoring probe and steel rebar. Two other series of abacus graphs are then introduced in order to determine the polarization resistance of the rebar in front of the monitoring probe (the point of interest (PI)). Two monitoring probes were placed in two types of concrete (one sound concrete and one concrete with chloride). Corrosion potential, concrete resistivity and rebar corrosion rate were monitored over around 200 days. The experimental results obtained with the monitoring probe are finally compared to the results obtained with the surface DIAMOND probe (introduced in the ICCRRR 2018 paper “Alternative methodology for linear polarization resistance assessment of reinforced concrete structure [1]”).

scholarly journals Evaluación mecánica de concreto y de corrosión en mortero con partículas de neumático reciclado

2013 ◽  
Vol 3 (3) ◽  
pp. 188-199
Author(s):  
C. Flores ◽  
S. Rodríguez ◽  
A. Cárdenas ◽  
O. Guarneros
Keyword(s):  
Mechanical Properties ◽  
Corrosion Rate ◽  
Compression Strength ◽  
Linear Polarization ◽  
Polarization Resistance ◽  
Corrosion Potential ◽  
Hardened Concrete ◽  
Scrap Tire ◽  
Linear Polarization Resistance ◽  
Polarization Resistance Method

RESUMENSe estudió la factibilidad del uso de partículas de neumático reciclado en concreto y morteros. Para evaluar las propiedades mecánicas del concreto endurecido se realizaron pruebas de densidad, resistencia a la compresión y determinación del módulo de elasticidad. Además se determinó la trabajabilidad del concreto en estado fresco mediante la prueba de revenimiento Las muestras se fabricaron con la sustitución de un 5%, 7.5% y 10 % del volumen de la arena por partículas de neumático reciclado. Se determinó mediante la técnica de potencial de corrosión el estado que guardaba en acero revisando de esta manera la probabilidad de corrosión. Para el estudio de la velocidad de corrosión se utilizó la técnica electroquímica de resistencia a la polarización lineal (RPL) en morteros fabricados bajo las mismas condiciones y proporciones que en los concretos. Los resultados mostraron que una mezcla con 7.5% de partículas de neumático reciclado puede ser utilizada en estructuras de resistencia moderada, ligera y ubicadas en ambientes con cloruros.Palabras clave: Concreto; mortero; neumático reciclado; velocidad de corrosión; Propiedades mecánicas.ABSTRACTThe feasibility of using scrap tire particles in the elaboration of concrete and mortar was investigated. To assess the mechanical properties of hardened concrete, tests evaluating of its density, modulus elasticity and compression strength were undertaken. To determine the workability of freshly made concrete, a slump test was also performed. Tests in which 5, 7.5 and 10% of sand were substituted by recycled tire particles were made. The likelihood of corrosion on the steel is determined, using the technique of corrosion potential. To test the velocity of corrosion was used the linear polarization resistance method (LPR method) was utilized under the same conditions as well as fabrication of concrete. It was observed that using 7.5% of recycled tire particles offers satisfactory results in structures of moderate strength and lighter weight located in environments with chlorides.Keywords: Concrete; mortar; recycled tire; corrosion rate; mechanical properties.

Remote Measurement of Linear Polarization Resistance In Concrete Structures

2016 ◽  
Vol 1815 ◽  
Author(s):  
F. Bernal Castillo ◽  
W. Aperador ◽  
G. Roa-Rodríguez
Keyword(s):  
Linear Polarization ◽  
Polarization Resistance ◽  
Concrete Structures ◽  
Mobile Network ◽  
Electrochemical Technique ◽  
Remote Measurement ◽  
Linear Polarization Resistance ◽  
Development Platform ◽  
Remote Measurements ◽  
Free Development

ABSTRACTThe monitoring of corrosion in reinforced concrete structures is considered an important preventive factor against the corrosive damage. The present paper shows the design and construction of a device which performs remote measurements of the polarization resistance of reinforcing steel, this was made using the electrochemical technique of linear polarization resistance as a method to obtain the information of the corrosive process. The development was carried out by implementing a potentiostat based on a free development platform. The design allows to store all the data on a physical memory and to send the results through the mobile network to a web server, where the measured values can be analyzed using an internet connection.The linear polarization resistance measurements were made in cylindrical concrete specimens with rebars of ½ ”, each one instrumented with embedded electrodes of Copper/Copper sulfate and graphite. The specimens were subjected to a saturated environment of chlorides (3.5%) where the corrosive process was monitored with the developed system. The results were compared with tests performed on a commercial potentiostat / galvanostat, where the values obtained have an mean of 4.83%.

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