Accounting for steel rebar effect on resistivity profiles in view of reinforced concrete structure survey

Alhajj, Marie Antoinette; Palma-Lopes, Sérgio; Villain, Géraldine

doi:10.1016/j.conbuildmat.2019.07.208

Cited by 22 publications

(18 citation statements)

References 20 publications

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“…This is due to the steel rebar influence in accordance with literature results (Polder, 2001). This influence was quantified by a direct model using finite elements by Alhajj et al (2019).…”

Section: Raw Results and Influence Of Steel Rebarssupporting

confidence: 84%

“…However, the presence of metal reinforcements alters the current lines in the reinforced concrete slabs, thus influencing apparent resistivity measurements. This influence can be quantified by finite element modelling (Alhajj et al 2019). It must be taken into account in the inversion process.…”

Section: Inversion Processmentioning

confidence: 99%

“…But the presence of metal reinforcements disturbs the electric field and the measurement of apparent resistivities (Sengul et al 2009, Presuel-Moreno et al 2013, Garzon et al 2014 and can prevent the inversion process, which is why the RILEM recommends to place itself at a distance from the reinforcements (Polder, 2001). The work of Alhajj et al (2019) showed that it was possible to reproduce by finite elements modelling the effect of the reinforcements on the measurement of apparent resistivities.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Towards the Determination of Chloride Profiles by means of Resistivity Measurements in Reinforced Concrete

Villain¹,

Alhajj²,

Lopes³

et al. 2020

XV International Conference on Durability of Building Materials and Components. eBook of Proceedings

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Reinforced concrete (RC) structures, such wharfs or floating structures, are submitted to chloride ingress which can lead to rebar corrosion. Before the corrosion initiation, in a preventive point of view, engineers can be interested in non-destructive evaluation and inspection methods. In that way, electrical resistivity tomography is a promising tool to access to resistivity profiles then to chloride profiles in real RC structures in the future. We would like to present herein the advances in the necessary research developments to reach this goal, i.e. the resistivity profiles obtained in reinforced concrete slabs submitted to chloride ingress. The 4 slab dimensions are 90x70x13 cm. The specimens are cured, dried during 9 months then submitted to salted water imbibition during 4 months. Electrical resistivity tomography measurements are performed at short terms during 1 week of imbibition. The monitoring show that several phenomena influence the resistivity profiles such as the penetration of water and chloride ions. Meanwhile, steel rebar effect can be considered thus eliminated from electrical resistivity profiles following the method developed by (Alhajj et al. 2019).

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Section: Raw Results and Influence Of Steel Rebarssupporting

confidence: 84%

Section: Inversion Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Towards the Determination of Chloride Profiles by means of Resistivity Measurements in Reinforced Concrete

Villain¹,

Alhajj²,

Lopes³

et al. 2020

XV International Conference on Durability of Building Materials and Components. eBook of Proceedings

View full text Add to dashboard Cite

show abstract

“…By realizing more resistivity profiles at increasing depths, a pseudo-section of the apparent resistivity can be obtained through inversion algorithms: this is known as electrical resistivity tomography [98]. A system suitable for this aim was employed by Alhajj et al [99], using a multi-electrode probe consisting of 14 electrodes equally spaced at intervals of 20 mm; four different electrode spacing are possible, namely 20, 40, 60, and 80 mm. It is worth underlining that the measurement results are influenced by cracks, reinforcing rebars, humidity, and voids.…”

Section: -Electrode Configurationmentioning

confidence: 99%

Electrical Resistivity and Electrical Impedance Measurement in Mortar and Concrete Elements: A Systematic Review

et al. 2020

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This paper aims at analyzing the state-of-the-art techniques to measure electrical impedance (and, consequently, electrical resistivity) of mortar/concrete elements. Despite the validity of the concept being widely proven in the literature, a clear standard for this measurement is still missing. Different methods are described and discussed, highlighting pros and cons with respect to their performance, reliability, and degree of maturity. Both monitoring and inspection approaches are possible by using electrical resistivity measurements; since electrical resistivity is an important indicator of the health status of mortar/concrete, as it changes whenever phenomena modifying the conductivity of mortar/concrete (e.g., degradation or attacks by external agents) occur, this review aims to serve as a guide for those interested in this type of measurements.

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“…The presence of steel reinforcement can disturb the electrical resistivity measurements, due to the fact that steel is a much better electrical conductor than the liquid phase in concrete. Various authors have cited the importance of steel's influence on the electrical resistivity measurement in a reinforced concrete structure (Millard, 1991;Polder et al, 2000;Bungey et al 2006, Reichling et al, 2015Alhajj et al, 2019;Villain et al, 2020). In this section, we compare the response of the PCB sensors between the HA and FV slabs to evaluate the influence of the reinforcement.…”

Section: Influence Of the Reinforcementmentioning

confidence: 99%

Implementation of an Embedded Sensor Based on Electrical Resistivity to Monitor Drying in Thick Concrete Structures

Badr¹,

Villain²,

Balayssac³

et al. 2020

XV International Conference on Durability of Building Materials and Components. eBook of Proceedings

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Electrical resistivity is a parameter sensitive to several properties of concrete, including water content, which is one of the key parameters governing concrete long-term durability. In this paper, the monitoring of the concrete water content profile throughout its entire thickness is discussed using an electrical approach as a measurement method. This is very relevant to applications requiring a centimeter resolution over a large thickness. The aim of this paper is to implement a multi-electrode embedded sensor in a concrete slab to determine the resistivity profile over concrete depth in order to monitor its drying. The sensor, designed as a printed circuit board (PCB), is integrated in two 30 cm thick concrete slabs. Different measurement configurations are presented. Following qualification in laboratory and controlled conditions, the study focuses on characterizing the sensor's response during the drying of the slabs. The results demonstrate the capability of the sensor to monitor concrete drying by measuring the resistivity profiles with a spatial centimetric resolution.

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Accounting for steel rebar effect on resistivity profiles in view of reinforced concrete structure survey

Cited by 22 publications

References 20 publications

Towards the Determination of Chloride Profiles by means of Resistivity Measurements in Reinforced Concrete

Towards the Determination of Chloride Profiles by means of Resistivity Measurements in Reinforced Concrete

Electrical Resistivity and Electrical Impedance Measurement in Mortar and Concrete Elements: A Systematic Review

Implementation of an Embedded Sensor Based on Electrical Resistivity to Monitor Drying in Thick Concrete Structures

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