In-suit monitoring electrical resistiviy in cover-zone concrete by Tower Type Sensor

Lü, Shuang; Ba, Housseinou; Yao, Yang

doi:10.1109/ictm.2009.5412923

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…The variation of the impedance with the frequency can be analyzed in terms of equivalent circuit models for describing the electrical behavior. The analysis typically involves the fitting of the curve in the Nyquist plot (plot of the imaginary part of the impedance to the real part of the impedance for various frequencies) [51][52][53][54]. However, the equivalent circuit model obtained by the curve fitting is not unique.…”

Section: Capacitance Of Cement-based Materialsmentioning

confidence: 99%

Piezoelectricity-based self-sensing of compressive and flexural stress in cement-based materials without admixture requirement and without poling

Shi¹,

Chung²

2018

Smart Mater. Struct.

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The self-sensing of compressive and flexural stress in cement-based materials (without embedded or attached sensors, without admixture requirement and without poling) by capacitance measurement has been demonstrated. The sensing involves two coplanar electrodes in the form of aluminum foil adhered to the cement-based material by using adhesive tape, which also serves as a dielectric film. The normal force associated with compressive or flexural loading is applied to the region between the electrodes. The stress regimes are the low-stress regime (up to 1500 Pa), the medium-stress regime (1500–7400 Pa) and the high-stress regime (7400–65 000 Pa). The lowest compressive/flexural stress demonstrated for effective sensing is 300 Pa. The fractional decrease in capacitance per unit stress is up to 2.2 × 10−6 Pa−1 and tends to decrease as the regime is changed from low to medium and to high-stress. The sensitivity tends to be greater for the compressive stress than flexural stress. However, when the normal stress (relevant to weighing) is considered, the sensitivity is higher for flexural loading than compressive loading. The strain contributes negligibly to the capacitance decrease, though the near-surface deformability of the cement-based material contributes. The change in capacitance upon stress application is attributed to the direct piezoelectric effect. The sensitivity is comparable for cement paste, mortar and concrete. Capacitance-based self-sensing is advantageous over resistance-based self-sensing in terms of the low-stress sensing effectiveness, absence of admixture or aggregate proportion requirements, essential absence of self-sensing effectiveness reduction by the presence of aggregates, wide applicability to existing concrete structures, and ease of applying electrodes.

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Section: Capacitance Of Cement-based Materialsmentioning

confidence: 99%

Piezoelectricity-based self-sensing of compressive and flexural stress in cement-based materials without admixture requirement and without poling

Shi¹,

Chung²

2018

Smart Mater. Struct.

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“…First, the expanded LPR method combined with an embeddable Ti/MnO 2 reference electrode was adopted for measuring the R p of the built-in steel anodes [ 19 ]. Subsequently, following our recent work, electrochemical impedance spectroscopy with a frequency range of 1 kHz to 50 kHz was adopted to obtain a more precise electrical resistance value and account for the non-homogeneity of the cement mortar and the interfacial characteristics of the mortar and steel sensor anodes [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Sensor for Monitoring the Service Condition of Chloride-Contaminated Cement Mortar

Lü

Ba²

2010

Sensors

Self Cite

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A corrosion sensor for monitoring the corrosion state of cover mortar was developed. The sensor was tested in cement mortar, with and without the addition of chloride to simulate the adverse effects of chloride-contaminated environmental conditions on concrete structures. In brief, a linear polarization resistance method combined with an embeddable reference electrode was utilized to measure the polarization resistance (Rp) using built-in sensor electrodes. Subsequently, electrochemical impedance spectroscopy in the frequency range of 1 kHz to 50 kHz was used to obtain the cement mortar resistance (Rs). The results show that the polarization resistance is related to the chloride content and Rs; ln (Rp) is linearly related to the Rs values in mortar without added chloride. The relationships observed between the Rp of the steel anodes and the resistance of the surrounding cement mortar measured by the corrosion sensor confirms that Rs can indicate the corrosion state of concrete structures.

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Research of the New Type of Compression Sensor

Bučinskas

Šutinys

Šešok

et al. 2018

Advances in Intelligent Systems and Computing

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In-suit monitoring electrical resistiviy in cover-zone concrete by Tower Type Sensor

Cited by 4 publications

References 9 publications

Piezoelectricity-based self-sensing of compressive and flexural stress in cement-based materials without admixture requirement and without poling

Piezoelectricity-based self-sensing of compressive and flexural stress in cement-based materials without admixture requirement and without poling

Corrosion Sensor for Monitoring the Service Condition of Chloride-Contaminated Cement Mortar

Research of the New Type of Compression Sensor

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