Probing the microstructure of cement mortars through dielectric parameters’ variation

Tsonos, Christos; Anastasiadis, C.; Kyriazopoulos, A.; Kanapitsas, A.; Triantis, Dimos

doi:10.1016/j.jpcs.2008.12.015

Cited by 21 publications

(11 citation statements)

References 24 publications

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“…Thanks to these mechanisms, it is meaningful to consider a frequency dependence of these relaxation processes based on the nature of the particles and ions and on the microstructure of the porous solid, which may explain the large range of frequencies reported in the literature for these kinds of relaxation effects. Polarization of the electrical double layer generally arises in the frequency range 1 kHz−1 MHz 28,34 and corresponds to the displacement of the counterion cloud relative to the charged particle. A very convincing study 12 showed that the Maxwell−Wagner relaxation process occurs in the range 1−10 5 Hz with a relaxation strength around 4, independent of RH and with a fairly well-resolved peak (α = 0.8 and β = 0.7).…”

Section: Ds Resultsmentioning

confidence: 99%

Dielectric Spectroscopy Study of Water Behavior in Calcined Upsalite: A Mesoporous Magnesium Carbonate without Organic Surface Groups

et al. 2015

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Section: Ds Resultsmentioning

confidence: 99%

Dielectric Spectroscopy Study of Water Behavior in Calcined Upsalite: A Mesoporous Magnesium Carbonate without Organic Surface Groups

et al. 2015

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“…Some researchers found a single relaxation (RQ) in OPC mortars [26,50], and also in cement pastes [51]. Other authors presented two relaxations, (R1Q1)(R2Q2) in OPC mortars [52,53], and even a single relaxation in series with a resistance has been proposed, R1(R2Q2) [54].…”

Section: ) Mip (Mercury Intrusion Porosimetry)mentioning

confidence: 99%

Drying-rewetting cycles in ordinary Portland cement mortars investigated by electrical impedance spectroscopy

Fita

Cruz

Calvo

et al. 2018

Construction and Building Materials

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Changes caused in the porous microstructure of ordinary Portland cement (OPC) mortars were studied using electrical impedance spectroscopy (EIS) and equivalent circuit (EqC). Two successive processes, at 20 ºC and 50 °C, consisting of several drying-rewetting cycles, were applied to the mortars. After each cycle, the electrical impedance and the amount of water absorbed were measured. The EIS-EqC methodology allowed to find two distributed impedance relaxations, associated to capillary and gel-C-S-H porosities, respectively. At room temperature any microstructural change was not detected. Nevertheless, at 50 °C two microstructural changes were inferred: 1) the volume of accessible porosity increased (pore coarsening) and 2) the surface of the conductive path through C-S-H gel became more conductive (surface smoothing).

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“…Until now, the study of electrical parameters changes on construction materials (e.g., cement, concrete, and raw materials) through radio frequencies (3 Hz–300 GHz) have been used for detecting chloride [ 23 ], and dielectric parameters’ variation have been studied for determining changes on the microstructure of cements due to hardening and admixtures presence [ 24 , 25 ]. These experimental works use DS, a technique that applying an alternate voltage and measuring phase and magnitude of the current can determine the dielectric behavior variation [ 24 ]. Also, this technique has shown good potential for measuring chlorides in other materials, such as pork meat [ 26 ].…”

Section: Theoretical Aspects Of the Sensormentioning

confidence: 99%

Chlordetect: Commercial Calcium Aluminate Based Conductimetric Sensor for Chloride Presence Detection

Torres-Luque¹,

Osma

Sánchez-Silva

et al. 2017

Sensors

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Chloride presence affects different environments (soil, water, concrete) decreasing their qualities. In order to assess chloride concentration this paper proposes a novel sensor for detecting and measuring it. This sensor is based on electric changes of commercial monocalcium aluminate (CA) when it interacts with chloride aqueous solutions. CA is used as a dielectric material between two coplanar capacitors. The geometry proposed for this sensor allows to assess the chloride content profile, or to make four times the same measurement. Besides, the experimental design gives us the possibility of study not just the chloride effect, but also the time and some geometric effects due to the sensor design. As a result, this sensor shows a limit of detection, sensitivity, and response time: 0.01 wt % Cl− and 0.06 wt % Cl−, and 2 min, respectively, comparable with other non invasive techniques as optical fibre sensors.

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Probing the microstructure of cement mortars through dielectric parameters’ variation

Cited by 21 publications

References 24 publications

Dielectric Spectroscopy Study of Water Behavior in Calcined Upsalite: A Mesoporous Magnesium Carbonate without Organic Surface Groups

Dielectric Spectroscopy Study of Water Behavior in Calcined Upsalite: A Mesoporous Magnesium Carbonate without Organic Surface Groups

Drying-rewetting cycles in ordinary Portland cement mortars investigated by electrical impedance spectroscopy

Chlordetect: Commercial Calcium Aluminate Based Conductimetric Sensor for Chloride Presence Detection

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