Coupled AC impedance and thermomechanical analysis of freezing phenomena in cement paste

Sato, Taijiro; Beaudoin, J.J.

doi:10.1617/s11527-010-9635-3

Cited by 23 publications

(12 citation statements)

References 10 publications

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“…It seems also quite promising to use this method to study the frost damage of concrete, especially for the ice formation process (Perron and Beaudoin 2002;Sato and Beaudoin 2011). The electrical conductivity of concrete depends on five factors: porosity, connectivity, chemical composition of pore solution, saturation degree (moisture content) of concrete and temperature .…”

Section: Introductionmentioning

confidence: 99%

“…Generally, when the temperature is decreasing below the freezing point, the content of unfrozen water gradually decreases. According to existing understandings (Whittngton et al 1981;Katsura et al 1996;Sato and Beaudoin 2011;Spragg et al 2013), both temperature and moisture content have a significant influence on the electrical conductivity of concrete. Weiss et al (2012) suggested the relationship between electrical conductivity and degree of saturation of concrete under normal temperatures considering the porosity, connectivity of concrete and chemical composition of the pore solution (modified from the model of Archie (1942) in soil science).…”

Section: Introductionmentioning

confidence: 99%

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Estimation of Ice Content in Mortar Based on Electrical Measurements under Freeze-Thaw Cycle

Wang

Gong

Zhang

et al. 2016

ACT

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Ice content is an essential factor that affects the internal pressure of cement-based materials during freeze-thaw cycles (FTCs). Since the electrical conductivity of mortar is closely related to its moisture content, it is possible to estimate the ice content based on electrical conductivity variation of mortar. As a result, the ice formation process during FTCs can be monitored. This paper proposed a model to estimate the ice content by applying electrical measurements and clarified the combined effects of temperature and moisture content for electrical conductivity of mortar. The ice content of mortar was estimated with the model by conducting the electrical test. The results are found in acceptable agreement with theoretical results from thermodynamic analysis, and the relationship between ice content and temperature is similar to existing calorimetric test results, which confirm the reliability of the model and the proposed test method.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Estimation of Ice Content in Mortar Based on Electrical Measurements under Freeze-Thaw Cycle

Wang

Gong

Zhang

et al. 2016

ACT

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“…It is possible to measure the electrical conductivity from the bulk electrical resistance of cementitious materials by AC impedance measurements, and Christensen reported an investigation with this technique based on theory and experiments (Christensen et al 1994). Numerous studies based on this technique were reported, and the effectiveness in measuring these properties of concrete has been shown (McCarter and Brousseau 1990;Keddam et al 1997;Gu 1993;Cabeza et al 2002;Sato and Beaudoin 2011;Scuderi et al 1991). McCarter et al (2000) reported that the electrical conductivity and permeability and the diffusion coefficient of mortar showed a good correlation, which shows the relationship between the electrical conductivity and other properties of cement-based materials.…”

Section: Introductionmentioning

confidence: 99%

Electrical Conductivity and Chloride Ingress in Hardened Cement Paste

Kurumisawa

Nawa

2016

ACT

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The transport properties of hardened cement paste (HCP) have been investigated in many studies; the AC impedance method (ACI) is a non-destructive technique employed for this purpose and has been used in investigations of the electrical characteristic and mass transport properties of HCP. However, there are relatively fewer studies investigating chloride ingress in HCP and using the ACI. In this study, the relationship between the electrical conductivity measured by the ACI and chloride ingress was investigated. Backscattered electron image analysis and mercury intrusion porosimetry and water porosity were used to measure the pore structure of HCP, and the chloride ingress depth was measured by an electron probe microanalyzer. There was a high correlation between the porosity and conductivity and between the conductivity and diffusion coefficient of the chloride ions in HCP. This implies that the diffusion coefficient of chloride ions could be estimated by the conductivity measurements.

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“…Studies have been reported on the variation in electrical impedance and resistivity of relatively young, cement pastes taken within the range -80/?20°C [15][16][17][18][19]; in addition, electrical measurements have also been used to study freeze-thaw damage in a Portland cement mortar within the temperature range -20/?50°C [20] and ice formation in concrete in the range -20/?0°C [2]. Work to date indicates that changes in the electrical properties of cement-based materials occur on freezing and thawing which reflects both the amount of frozen pore water and mobility of the pore water.…”

Section: Introductionmentioning

confidence: 99%

Conductivity/activation energy relationships for cement-based materials undergoing cyclic thermal excursions

et al. 2014

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The electrical conductivity of a range of concrete mixes, with and without supplementary cementitious materials (SCM), is studied through multiple cycles of heating and cooling over the extended temperature range -30/?70°C. When presented in an Arrhenius format, the experimental results display hysteresis effects at the lowtemperature end of the thermal cycle and, in those concretes containing supplementary cementitious materials at higher water/binder ratios, hysteresis effects were evident over the entire temperature range becoming more discernible with increasing number of thermal cycles. The depression in both the freezing and thawing point could be clearly identified and was used to estimate pore-neck and pore-cavity radii. A simplified approach is presented to evaluate the volumetric ratio of frozen pore water in terms of conductivity measurements. The results also show that the conductivity and activation energy of the concrete specimens were related to the water/binder ratio, type of SCM, physical state of the pore water and the thermal cycling regime.

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Coupled AC impedance and thermomechanical analysis of freezing phenomena in cement paste

Cited by 23 publications

References 10 publications

Estimation of Ice Content in Mortar Based on Electrical Measurements under Freeze-Thaw Cycle

Estimation of Ice Content in Mortar Based on Electrical Measurements under Freeze-Thaw Cycle

Electrical Conductivity and Chloride Ingress in Hardened Cement Paste

Conductivity/activation energy relationships for cement-based materials undergoing cyclic thermal excursions

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