Combined time domain reflectometry and AC-impedance spectroscopy of fiber-reinforced fresh-cement composites

Woo, Leta; Kidner, Neil J.; Wansom, S.; Mason, Thomas O.

doi:10.1016/j.cemconres.2006.09.004

Cited by 13 publications

(8 citation statements)

References 14 publications

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“…In the discussion below, the two-point method is used as, from a practical point of view, it has the added advantage of being much simpler to perform than the four-point method [and other methods such as the time domain reflectometry (TDR) (Woo et al 2007;Rangelov and Nassiri 2019)] and hence lends itself to in-situ monitoring and remote interrogation (McCarter et al 2012).…”

Section: Preliminaries and Data Processingmentioning

confidence: 99%

Assessing the Performance and Transport Properties of Concrete using Electrical Property Measurements

Suryanto

Kim

McCarter

et al. 2020

ACT

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The electrical properties of porous systems are intimately linked to mass transport and flow processes such as diffusion and permeability and offer a simple testing methodology for assessing those properties which are responsible for the durability and long-term performance of construction materials. In the current study, electrical impedance spectra for concretes containing both plain and blended Portland cement binders were obtained over a period of 360 days. In-situ impedance measurements were used to accurately identify the bulk resistance (hence evaluation of resistivity) of the concretes and the optimum frequency range for bulk resistance measurements. The bulk resistivity was normalised by that of the pore-fluid resistivity obtained from computer simulations and the results indicated that the pore-fluid resistivity decreased only marginally with time once the hydration process had advanced beyond 28 days. It is shown that the normalised resistivity-termed the Formation Factor-displayed a continual increase with time, highlighting ongoing hydration/pozzolanic reaction and pore structure refinement over the entire test period. This was particularly evident for the slag concretes. Using the normalisation process, a simple approach is presented to evaluate the effective diffusion coefficient of the concretes and a durability/performance classification system, based on the Formation Factor, is presented.

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Section: Preliminaries and Data Processingmentioning

confidence: 99%

Assessing the Performance and Transport Properties of Concrete using Electrical Property Measurements

Suryanto

Kim

McCarter

et al. 2020

ACT

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“…Electrical conductivity of a cementitious system can be measured in many ways. This study uses AC-impedance spectroscopy [6]. Two-point AC-IS measurements were made with a Solartron 1260 impedance/gain-phase analyzer [7] using Z-60 personal computer software for data acquisition.…”

Section: Electrical Conductivity Using Impedance Spectroscopy (Is)mentioning

confidence: 99%

A Comparison of test methods for early-age behavior of cementitious materials

Bullard¹,

D'Ambrosia²,

Grasley³

et al. 2006

2nd International RILEM Symposium on Advances in Concrete Through Science and Engineering

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A wide range of tests has been reported that can be used for probing different aspects of the chemical and structural properties of cement paste and concrete at early ages. In principle, these tests should be complementary and their results could be integrated to develop a broader understanding of early-age behaviour. Under the auspices of the Center for Advanced Cement Based Materials (ACBM), an inter-laboratory study was undertaken to compare the results of several of these different test methods on a single cement. A large quantity of cement was homogenized by the Cement and Concrete Reference Laboratory (CCRL), as part of their proficiency sample program, and distributed to several ACBM researchers for independent testing. Aggregates for making mortar were supplied from a single source (graded Ottawa sand). Tests on pastes and mortars included calorimetry, compressive strength, Vicat needle penetration, chemical shrinkage, autogenous shrinkage, AC-impedance spectroscopy, time domain reflectometry, and ultrasonic shear wave reflectometry. Numerical simulations of the same materials were undertaken for comparison. Results from these tests will be compared with respect to the way in which they capture solidification and strength development. 1.

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“…AC impedance spectra was used to investigate the fiber dispersion issues of orientation, segregation and clumping in fresh cement matrix composites [34]. It was reported that the interfacial transition zone did not affect the global electrical conductivity while there were differences between the conductivities of transition zone and matrix pastes.…”

Section: Introductionmentioning

confidence: 99%

Measurement of crack length sensitivity and strain gage factor of carbon fiber reinforced cement matrix composites

Teomete

2015

Measurement

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Combined time domain reflectometry and AC-impedance spectroscopy of fiber-reinforced fresh-cement composites

Cited by 13 publications

References 14 publications

Assessing the Performance and Transport Properties of Concrete using Electrical Property Measurements

Assessing the Performance and Transport Properties of Concrete using Electrical Property Measurements

A Comparison of test methods for early-age behavior of cementitious materials

Measurement of crack length sensitivity and strain gage factor of carbon fiber reinforced cement matrix composites

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