Comparison of electrical and self-sensing properties of Portland cement and alkali-activated slag mortars

Rovnanı́k, Pavel; Kusák, Ivo; Bayer, Patrik; Schmid, Pavel; Fiala, Lukáš

doi:10.1016/j.cemconres.2019.02.009

Cited by 94 publications

(52 citation statements)

References 26 publications

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“…Electrical impedance is frequency dependent, and so sweeping the frequency can lead to a rich dataset. The AC frequency can be selected to minimize or maximize the measurement of capacitive or resistive effects in the sample, depending on the application [24,26,57] and allows for the elimination of polarization if desired [26,52,86]. Overall, however, frequency tends to be selected to produce the highest sensitivity to measurands during characterization [24,55].…”

Section: Electrical Impedancementioning

confidence: 99%

“…The sensor's performance is usually at its peak within this region. In various cases, a nonlinear segment with low sensitivity at the very early stages of loading has been detected [55,86] which has also been regarded as a separate region in monotonic compression altogether [124]. This has led to applications commencing above zero [24,55,86].…”

Section: Monotonic Loadingmentioning

confidence: 99%

“…In various cases, a nonlinear segment with low sensitivity at the very early stages of loading has been detected [55,86] which has also been regarded as a separate region in monotonic compression altogether [124]. This has led to applications commencing above zero [24,55,86]. While this has been attributed to contact resistance between the substrate and electrodes in two-probe sensing [86], this behaviour has also been observed in four-probe sensing applications as well [55].…”

Section: Monotonic Loadingmentioning

confidence: 99%

See 2 more Smart Citations

Self-Sensing Alkali-Activated Materials: A Review

2020

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Alkali-activated materials are an emerging technology that can serve as an alternative solution to ordinary Portland cement. Due to their alkaline nature, these materials are inherently more electrically conductive than ordinary Portland cement, and have therefore seen numerous applications as sensors and self-sensing materials. This review outlines the current state-of-the-art in strain, temperature and moisture sensors that have been developed using alkali activated materials. Sensor fabrication methods, electrical conductivity mechanisms, and comparisons with self-sensing ordinary Portland cements are all outlined to highlight best practice and propose future directions for research.

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Section: Electrical Impedancementioning

confidence: 99%

Section: Monotonic Loadingmentioning

confidence: 99%

Section: Monotonic Loadingmentioning

confidence: 99%

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Self-Sensing Alkali-Activated Materials: A Review

2020

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“…Figure 5. Cumulative pore distribution measured by MIP Rovnaník, P.;Kusák, I.;Topolář, L.;Schmid, P. 2019…”

Section: Microstructurementioning

confidence: 99%

“…Rovnaník, P.;Kusák, I.; Topolář, L.;Schmid, P. 2019. Sensing properties of slag-based geopolymer composite with carbon fibers under compressive loading…”

mentioning

confidence: 99%

Sensing properties of slag-based geopolymer composite with carbon fibers under compressive loading

Rovnanı́k

Kusák

Topolář

et al. 2019

Modern Building Materials, Structures and Techniques (MBMST)

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Application of functional materials has become a new trend in the construction industry. This paper aims to study the electrical and self-sensing properties of slag-based geopolymer composite. In order to improve the electrical conductivity of the basic geopolymer mortar, carbon fibers in the amount of 0.5, 1 and 2% were added. The influence of fiber addition on the electrical properties was determined by impedance spectroscopy and microstructure was analyzed by means of mercury intrusion porosimetry and SEM. The sensing properties were tested under repeated compressive loading in the elastic range and finally under loading till failure. The electrical resistance decreased with the addition of carbon fibers but it caused a deterioration of the mechanical properties. The addition of fibers does not generally improve the sensing performance of the geopolymer composite, but the mixture with 2% of fibers appeared to be unsuitable for this purpose due to the low signal-to-noise ratio.

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Use of Impedance Spectroscopy for the Characterization of the Microstructure of Alkali Activated SiMn Slag: Influence of Activator and Time Evolution

et al. 2022

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The impedance spectroscopy technique has been used to study the microstructure of the binder resulting from the alkaline activation of SiMn slag. Two alkaline activators were used: waterglass and NaOH. Three different concentrations were analysed for both activators: 3.0, 3.5 and 4.0% Na2O for NaOH; and 4.0, 4.5 and 5.0% Na2O for waterglass with a constant SiO2/Na2O ratio of 1.0. The time evolution of the microstructure has been followed up using the non-destructive technique of impedance spectroscopy. This technique has been proved to be effective describing the microstructural changes in alkali activated pastes, and also can help predicting the mechanical behavior of mortars. The use of the resistivity itself seems to be deficient, but the analysis of the electrical parameters calculated from the impedance spectra measured gives a complete idea of the evolution in the material.

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Comparison of electrical and self-sensing properties of Portland cement and alkali-activated slag mortars

Cited by 94 publications

References 26 publications

Self-Sensing Alkali-Activated Materials: A Review

Self-Sensing Alkali-Activated Materials: A Review

Sensing properties of slag-based geopolymer composite with carbon fibers under compressive loading

Use of Impedance Spectroscopy for the Characterization of the Microstructure of Alkali Activated SiMn Slag: Influence of Activator and Time Evolution

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