Monitoring the pozzolanic effect of fly ash in blended OPC mortars by electrical impedance spectroscopy

Fita, Inmaculada Concepción; Cruz, J.M.; Bouzón, N.; Borrachero, M.V.; Payá, J.

doi:10.1016/j.conbuildmat.2021.125632

Cited by 16 publications

(4 citation statements)

References 58 publications

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“…Until the pozzolanic activation of fly ash starts (according to Ref. 47 it starts approx. after 90 days), the strength of the composite decreases as the amount of the substituted binder increases 48 .…”

Section: Resultsmentioning

confidence: 99%

Electrically conductive composite materials with incorporated waste and secondary raw materials

Baránek

Černý

Drochytka

et al. 2023

Sci Rep

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Silicate composites have very low conductivity in general. It is possible to achieve an electrical resistivity decrease by adding an electro-conductive filler. The conductive mixture consists of cementitious binder, various types of silica sand, and graphite-based conductive fillers. One of the research focusses is partial substitution of ordinary raw materials by alternative components (waste materials by-products and secondary raw materials) and its influence on composite properties. The alternative components studied were fly ash as a partial binder replacement, waste graphite from two different sources and steel shavings as a substitute for conductive filler. Resistivity of cured conductive silicate-based specimens was analysed in relation to changes in physico-mechanical properties in context of microstructural changes in the hardened cementitious matrix (by optical and scanning electron microscopy with energy disperse analysis). Partial substitution of cement by fly ash was found to reduce the electrical resistivity of the composite. Some of the waste graphite fillers significantly reduce the resistivity of the cement composite and increase the compressive strength. It was proven, that is possible to replace primary conductive fillers by secondary raw materials.

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Section: Resultsmentioning

confidence: 99%

Electrically conductive composite materials with incorporated waste and secondary raw materials

Baránek

Černý

Drochytka

et al. 2023

Sci Rep

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“…It is worth mentioning that many models were developed to characterise the different physical properties of cement-based materials based on the admixtures used, and each model can be interpreted in various ways. Besides studying the effect of the hydration process using ACIS measurement, as has been discussed earlier, other advantages of using the ACIS measurement in the case of cement-based materials include studying the effect of the chloride diffusivity [ 76 , 166 ], the effect of various temperatures and humidity [ 167 ], the effect of fly ash in blended OPC mortars [ 168 ], the effect of the influencing factors in a novel repairing material [ 169 ], the effect of brick powders as a partial replacement for fine aggregates [ 170 ], the effect of nanomaterials in cement-based mortars [ 171 ], and the effect of mineral admixtures on the durability of prestressed concrete cylinder pipe [ 172 ].…”

Section: Equivalent Circuit Modelmentioning

confidence: 99%

Piezoresistivity and AC Impedance Spectroscopy of Cement-Based Sensors: Basic Concepts, Interpretation, and Perspective

et al. 2023

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Cement-based sensors include conductive fillers to achieve a sensing capability based on the piezoresistivity phenomenon, in which the electrical resistivity changes with strain. The microstructural characterisation of cement-based sensors can be obtained using a promising non-destructive technique, such as AC impedance spectroscopy (ACIS), which has been recently used by many researchers. This paper reviews the fundamental concepts of piezoresistivity and ACIS in addition to the comparison of equivalent circuit models of cement-based sensors found in the literature. These concepts include piezoresistivity theory, factors affecting piezoresistivity measurement, resistance measurement methodology, strain/damage sensing, causes of piezoresistivity, theories of conduction, AC impedance spectroscopy theory, and the equivalent circuit model. This review aims to provide a comprehensive guide for researchers and practitioners interested in exploring and applying different techniques to self-sensing concrete.

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“…For instance, there are quite strong correlations between electrical parameters and water saturation in porous materials [6][7][8][9][10][11], and electrical parameter change in cement-based materials can match the load-deflection curve quite well in strength tests [12,13]. Also, the electrical parameters of cement-based materials have correspondence with different stages of the hydration reaction [14][15][16] as well as with alkali-silicate reaction, delayed ettringite formation and the pozzolanic effect [17,18]. Early-age resistivity of cement-based materials can even be used to predict the material properties over a longer period [19,20].…”

Section: Introductionmentioning

confidence: 99%

Exploration on electrical resistance tomography in characterizing the slurry spatial distribution in cemented granular materials

Wang,

Jin

et al. 2024

Front. Struct. Civ. Eng.

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This study investigated the application of electrical resistance tomography (ERT) in characterizing the slurry spatial distribution in cemented granular materials (CGMs). For CGM formed by self-flow grouting, the voids in the accumulation are only partially filled and the bond strength is often limited, which results in difficulty in obtaining in situ samples for quality evaluation. Therefore, it is usually infeasible to evaluate the grouting effect or monitor the slurry spatial distribution by a mechanical method. In this research, the process of grouting cement paste into high alumina ceramic beads (HACB) accumulation is reliably monitored with ERT. It shows that ERT results can be used to calculate the cement paste volume in the HACB accumulation, based on calibrating the saturation exponent n in Archie’s law. The results support the feasibility of ERT as an imaging tool in CGM characterization and may provide guidance for engineering applications in the future.

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Monitoring the pozzolanic effect of fly ash in blended OPC mortars by electrical impedance spectroscopy

Cited by 16 publications

References 58 publications

Electrically conductive composite materials with incorporated waste and secondary raw materials

Electrically conductive composite materials with incorporated waste and secondary raw materials

Piezoresistivity and AC Impedance Spectroscopy of Cement-Based Sensors: Basic Concepts, Interpretation, and Perspective

Exploration on electrical resistance tomography in characterizing the slurry spatial distribution in cemented granular materials

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