Electrical effects generated by mechanical loading of hardened Portland cement paste

Cabeza, M.; Merino, P.; Nóvoa, X.R.; Sánchez, Isidro

doi:10.1016/s0958-9465(02)00053-7

Cited by 36 publications

(28 citation statements)

References 16 publications

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“…As expected, the high frequency capacitance C 1 , associated to the solid phase, do not vary with applied load, as it has already been reported [13]. A common point for all samples is that the capacitance C 2 increases and R 2 decreases as the mechanical load applied to the sample increases.…”

Section: Impedance Spectroscopy Resultssupporting

confidence: 87%

“…A common point for all samples is that the capacitance C 2 increases and R 2 decreases as the mechanical load applied to the sample increases. This fact has been explained in terms of water movement to the empty pores [13]. The influence of sample thickness and w:c ratio was studied with daily impedance measurements.…”

Section: Impedance Spectroscopy Resultsmentioning

confidence: 99%

“…Impedance spectra of samples were obtained using the method that avoids contact between sample and electrodes, as described in [13].…”

Section: Impedance Spectroscopymentioning

confidence: 99%

“…The impedance spectra in their Cole-Cole representations were fitted to the equivalent circuit already proposed [13]. The fitting to the model was done using a simplex method already described [19].…”

Section: (B) the Equation For This Transformation Is Eq (2)mentioning

confidence: 99%

“…If water has something to do with creeping, then the time constant associated to the electrolyte will vary during loading and unloading of samples. A work published in 2003 showed the effect of mechanical loading on the dielectric properties of cement pastes [13]. This effect consisted in an increase of the capacitance and a decrease of the resistance associated to the electrolyte in pores, and was interpreted in terms of water displacements to empty spaces in the microstructure of the material.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Use of impedance spectroscopy to determine the displacement of water in cement paste under small loads

Sánchez¹,

Castro²,

Climent³

et al. 2007

WIT Transactions on Engineering Sciences, Vol 57

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The effect of mechanical loading in concrete structures may cause deformation by creeping. The physical origin of this phenomenon is not well known, but water seems to play an essential role in it. Impedance spectroscopy in the high frequency region can detect water movements towards empty pores, even when the applied load is small. In this paper a system for application of mechanical loading compatible with simultaneous impedance spectroscopy measurements is presented. The effect of several parameters (ageing, water to cement ratio, water content) on cement paste samples' performance under mechanical loading is analysed through the corresponding impedance spectra.

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Section: Impedance Spectroscopy Resultssupporting

confidence: 87%

Section: Impedance Spectroscopy Resultsmentioning

confidence: 99%

“…Impedance spectra of samples were obtained using the method that avoids contact between sample and electrodes, as described in [13].…”

Section: Impedance Spectroscopymentioning

confidence: 99%

Section: (B) the Equation For This Transformation Is Eq (2)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Use of impedance spectroscopy to determine the displacement of water in cement paste under small loads

Sánchez¹,

Castro²,

Climent³

et al. 2007

WIT Transactions on Engineering Sciences, Vol 57

Self Cite

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Impedance spectroscopy: An efficient tool to determine the non‐steady‐state chloride diffusion coefficient in building materials

Sánchez

López

Ortega

et al. 2011

Materials & Corrosion

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One of the most important problems of reinforced steel concrete in marine environments is the corrosion of the reinforcing bars. Most of the times, this corrosion is a consequence of the local destruction of the passive layer formed on the surface of the embedded steel, due to the arrival of chlorides present in the environment. Many efforts have been made to determine the chloride diffusion coefficient in concrete structures, both using natural diffusion methods, and accelerated migration methods. This coefficient determines the velocity of ingress of chlorides, and as a consequence the life time of the structures. In this work it is presented the possibility of using the technique of impedance spectroscopy, that is, very simple to use and requires no chemical or conductivity measurement, to determine the value of the non-steady-state diffusion coefficient. This technique, together with the equivalent circuits proposed for the interpretation of the measurements, allows the determination of the chloride saturation of a concrete or mortar sample. Pores of the material that are initially filled with water have high resistivity, and as the chlorides penetrate into the sample the value of the resistivity decreases. This diminution can be determined in situ, and permits the calculation of the diffusion coefficient saving experimental time and efforts. The results have been obtained both with concrete and mortar samples, and using different cement types.

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Methodology

Zhang¹

2017

Study on Microstructure and Rheological Properties of Cement-Chemical Admixtures-Water Dispersion System at Early Stage

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Electrical effects generated by mechanical loading of hardened Portland cement paste

Cited by 36 publications

References 16 publications

Use of impedance spectroscopy to determine the displacement of water in cement paste under small loads

Use of impedance spectroscopy to determine the displacement of water in cement paste under small loads

Impedance spectroscopy: An efficient tool to determine the non‐steady‐state chloride diffusion coefficient in building materials

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