Determination of reinforced concrete durability with on-site resistivity measurements

Andrade, Carmen; Torres, Julio; Rebolledo, Nuria; Fullea, J.

doi:10.1617/s11527-016-0884-7

Cited by 31 publications

(21 citation statements)

References 17 publications

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“…The last and recent study in this category belongs to Sanchez et al [74] who numerically proposed a modified 4-point Wenner method based on the experimental data, deployed on a bridge over the River Danube in Romania. In this study, a "rebar factor," , was introduced through the modified version of Wenner method to measure the resistivity in reinforced concrete structures with thin concrete covers.…”

Section: Presence Of Rebarmentioning

confidence: 99%

Electrical Resistivity of Concrete for Durability Evaluation: A Review

Azarsa

Gupta

2017

Advances in Materials Science and Engineering

229

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Degradation processes in reinforced concrete structures that affect durability are partially controlled by transport of aggressive ions through the concrete microstructure. Ions are charged and the ability of concrete to hold out against transfer of ions greatly relies on its electrical resistivity. Hence, a connection could be expected between electrical resistivity of concrete and the deterioration processes such as increase in permeability and corrosion of embedded steel. Through this paper, an extensive literature review has been done to address relationship between concrete electrical resistivity and its certain durability characteristics. These durability characteristics include chloride diffusivity and corrosion of reinforcement as these have major influence on concrete degradation process. Overall, there exists an inverse or direct proportional correlation between these parameters. Evaluated results, from measuring the concrete electrical resistivity, can also be used as a great indicator to identify early age characteristics of fresh concrete and for evaluation of its properties, determination of moisture content, connectivity of the micropores, and even condition assessment of in-service structures. This paper also reviews and assesses research concerning the influential parameters such as environmental conditions and presence of steel rebar and cracks on measuring electrical resistivity of concrete. Moreover, concrete resistivity concept, application, and its various measurement techniques are introduced.

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Section: Presence Of Rebarmentioning

confidence: 99%

Electrical Resistivity of Concrete for Durability Evaluation: A Review

Azarsa

Gupta

2017

Advances in Materials Science and Engineering

229

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“…3 is applied for homogeneous semi-infinite volumes. However, experiments have indicated that sample size and the presence of steel bar(s) can lead to erroneous results [4,[20][21][22] and these aspects have to be considered carefully to obtain the correct resistivity value [7]. Both two-electrode and…”

Section: = ωmentioning

confidence: 99%

“…The current was injected through the CE. Different CE diameters were modelled (20,22,30,40,50, 60 and 70 mm). The RE was a cylinder in contact with the surface and the CE was a disc with a hole in it to enable RE contact with surface ( Figure 5).…”

Section: Geometry and Meshmentioning

confidence: 99%

A new methodology for concrete resistivity assessment using the instantaneous polarization response of its metal reinforcement framework

Samson

Deby

Garciaz³

et al. 2018

Construction and Building Materials

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A new methodology is developed to assess concrete cover resistivity using the instantaneous response of the polarization of a metal rebar (galvanostatic pulse method). The instantaneous ohmic drop is linked only with the concrete resistance, which depends on the concrete cover and resistivity, and rebar diameter. A numerical model was developed in Comsol Multiphysics® in order to create a graph linking concrete resistivity to concrete resistance for concrete cover ranging between 1 to 160 mm. This graph and the measured ohmic drop can be used to determine concrete resistivity for any rebar diameter/concrete cover configuration. The theory developed numerically was then confirmed using an experimental setup with controlled water resistivity. The theory is then generalized for counter electrode (CE) diameter ranging from 20 to 70 mm. Finally, the study reveals that the graph developed for a single rebar can be used for any rebar framework density.

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“…La corrosión de las armaduras, y principalmente por el efecto de los iones cloruro, es la principal causa de disminución de la vida útil de las estructuras de hormigón armado [1][2][3]. Como es sabido, el hormigón es un material con un pH alto (básico) lo cual sitúa al acero en unas condiciones de pasividad, puesto que proporciona la formación de una capa pasiva en la superficie de la armadura [4].…”

Section: Introducción 11 Problemática De Cloruros Y Corrosión De Armunclassified

Nueva metodología para la delimitación de las zonas a reparar de un hormigón afectado por corrosión

Chinchón-Payá¹,

Basagoiti²,

Mateos³

et al. 2020

hya

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La reparación por parcheo de una estructura de hormigón armado afectada por corrosión es una operación compleja que requiere una importante inversión económica. Es dicha necesidad de disminuir los costes por parte de la entidad responsable la que condiciona en gran medida la extensión de la intervención sucediendo que, en la mayoría de ocasiones, se reparan únicamente las zonas visiblemente degradadas dejándose sin reparar zonas aparentemente sanas. Ese criterio restrictivo puede ser totalmente inadecuado, al poder estar dejando sin sanear, en zonas adyacentes a las reparadas, un hormigón con un alto contenido del agente más agresivo en estos procesos de corrosión, que es el ion cloruro. Ello puede originar nuevos procesos de corrosión en un plazo de pocos años, limitando severamente la durabilidad de la reparación efectuada. Este artículo describe el uso en obra de un equipo portátil de fluorescencia_de_rayos_X (FRX) para la cuantificación de cloruros en muestras de hormigón extraídas de diferentes zonas de una estructura afectada por corrosión. Se analizan tanto zonas degradadas como zonas aparentemente sanas. Teniendo en cuenta el valor límite de concentración de cloruros propuesto por la EHE a partir del cual se considera que una concentración de dicho ion es perjudicial, se pueden delimitar con un criterio más adecuado las zonas a reparar, extendiendo la intervención a zonas adyacentes a las claramente dañadas, aparentemente sanas, pero en las que la concentración de cloruros en el hormigón supera dicho límite. Los equipos portátiles FRX hasta ahora no habían sido empleados en el estudio de procesos patológicos de estructuras de hormigón. Sin embargo, resultan una herramienta muy útil en diagnóstico de procesos de deterioro de una estructura degradada por corrosión por cloruros en la armadura de acero y de uso fundamental para delimitar de manera objetiva las áreas de actuación, limpieza, renovación y reparación del hormigón.

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Determination of reinforced concrete durability with on-site resistivity measurements

Cited by 31 publications

References 17 publications

Electrical Resistivity of Concrete for Durability Evaluation: A Review

Electrical Resistivity of Concrete for Durability Evaluation: A Review

A new methodology for concrete resistivity assessment using the instantaneous polarization response of its metal reinforcement framework

Nueva metodología para la delimitación de las zonas a reparar de un hormigón afectado por corrosión

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