Empirical time-dependent tortuosity relations for hydrating mortar mixtures based on modified Archie’s law

Rangelov, Milena; Nassiri, Somayeh

doi:10.1016/j.conbuildmat.2018.03.173

Cited by 17 publications

(11 citation statements)

References 57 publications

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“…is type of sensor is currently used in soil applications for the assessment of soil salinity and water content. e authors demonstrated the application of the sensors in cement-based materials in earlier publications [6,7]. In this study, one 5TE sensor was vertically embedded at middepth location of each cylinder specimen during casting.…”

Section: Materials and Mixturesmentioning

confidence: 96%

“…In Figures 2(b)-2(d), the use of SCM results in overall lower values of σ compared to the plain mixture and the more use of SCM results in lower values of conductivity. e trend is due to the products of SCM late pozzolanic reaction, which lls the capillary pores, making the pore system discontinuous and less conductive [6,26,27]. At T c < 23°C, σ data of GGBFS_40, Fly_ash_40, and Fly_ash_60 approach near-zero values.…”

Section: E Ect Of Temperature On Electrical Conductivity Of MIXmentioning

confidence: 98%

“…e e ect of mixture parameters can be identi ed based on the di erence in the values of σ among the di erent mixtures in Figure 2(a); mixtures with lower w/cm exhibit lower values of σ, as an e ect of lower amount of pore solution in the pore system, as well as less connected (more tortuous) capillary pores [6,24,25]. In Figures 2(b)-2(d), the use of SCM results in overall lower values of σ compared to the plain mixture and the more use of SCM results in lower values of conductivity.…”

Section: E Ect Of Temperature On Electrical Conductivity Of MIXmentioning

confidence: 99%

“…e measurements are taken by several available methods based on uniaxial or bulk resistivity, surface resistivity, electrical impedance spectroscopy, and noncontact resistivity measurements based on the transformer principle [1][2][3][4][5]. Additionally, embedded sensors for real-time ρ monitoring were evaluated in past studies [6][7][8]. Since electrical current in the concrete is primarily conducted through the pore solution in the pore system, electrical measurements can be used to indirectly evaluate pore system and transport properties of concrete [5,6,9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, embedded sensors for real-time ρ monitoring were evaluated in past studies [6][7][8]. Since electrical current in the concrete is primarily conducted through the pore solution in the pore system, electrical measurements can be used to indirectly evaluate pore system and transport properties of concrete [5,6,9,10]. Relatively high ρ (low σ) is a characteristic of concrete with dense microstructure, low porosity, and poorly interconnected pores.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Methods to Correct the Effect of Temperature on Electrical Conductivity of Mortar

Rangelov

Nassiri

2018

Advances in Civil Engineering

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Nondestructive methods to obtain the electrical conductivity (σ) or resistivity (ρ) of concrete are gaining popularity for durability evaluation. However, these methods are susceptible to the effects of curing and conditioning, primarily temperature and degree of saturation. Before σ of concrete at varied temperatures can be used for durability assessment, appropriate corrections must be made to account for the effect of temperature (T). In this study, two existing and one new temperature correction methods were evaluated for 12 mortar mixtures varying in water-to-cementitious material ratio (w/cm) and the content and types of supplementary cementitious materials (SCM). Mortar specimens instrumented with embedded sensors were cured in sealed conditions for 11–13 months. After this period, the sealed specimens were subjected to stepwise temperature change in 5–50°C range while σ was recorded using the embedded sensors. Linear, bilinear, and Arrhenius temperature correction (LTC, BLTC, and ATC, respectively) were fitted to the obtained σ-T datasets and were evaluated for fitness. LTC provided an acceptable fit to the σ-T data (R2 > 0.81) but was found the most suitable in 5–30°C temperature range. BLTC was defined as a combination of two distinct LTC below and above the reference temperature at 23°C and had a better fit to the data (R2 > 0.96). Lastly, ATC showed the best fit among the tested methods (R2 > 0.98) and was found applicable for the full tested temperature range. Comparison of correction coefficients among the mixtures indicated that increase in w/cm results in less sensitivity of σ to temperature. Mixtures with SCM generally exhibit higher temperature sensitivity compared to the corresponding plain mixture. Since the variations in correction coefficients were not substantial (less 18% variation among 10 of 12 mixtures), a single value of activation energy of conduction (Ec) at 32 kJ/mol was identified as the general recommendation for all the tested mixtures.

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Section: Materials and Mixturesmentioning

confidence: 96%

Section: E Ect Of Temperature On Electrical Conductivity Of MIXmentioning

confidence: 98%

Section: E Ect Of Temperature On Electrical Conductivity Of MIXmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of Methods to Correct the Effect of Temperature on Electrical Conductivity of Mortar

Rangelov

Nassiri

2018

Advances in Civil Engineering

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Zur Anwendbarkeit des Formationsfaktors als Gefügekennwert für Mörtel aus verschiedenen alternativen Bindemittelsystemen

Raupach,

Achenbach,

Ludwig

et al. 2023

ce papers

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KurzfassungIm Rahmen eines von der Deutschen Forschungsgemeinschaft, DFG, geförderten Forschungsprojektes zum Einfluss alternativer Bindemittelsysteme auf das Korrosionsverhalten der Stahlbewehrung werden derzeit in Zusammenarbeit mit dem F. A. Finger‐Institut für Baustoffkunde der Bauhaus‐Universität Weimar und dem Institut für Baustoffforschung der RWTH Aachen University umfangreiche Untersuchungen durchgeführt. Im Rahmen dieses Projektes, wurde auch untersucht, inwiefern der sogenannte Formationsfaktor als eine einfach zu ermittelnde Kenngröße zur Charakterisierung des Gefüges geeignet ist.Der Formationsfaktor wird in der Geophysik seit Jahrzehnten zur Charakterisierung poröser Sandsteine und Böden verwendet. Er wird als Quotient des elektrischen Widerstandes der porösen Probe und dem elektrischen Widerstand des in den Poren enthaltenen Fluids ermittelt. Untersuchungen verschiedener Forscher zeigen, dass der Formationsfaktor unter bestimmten Randbedingungen für herkömmliche Betone sehr gut mit relevanten Transportkenngrößen und Schädigungsvorgängen korreliert. Im Rahmen dieses Beitrags soll herausgearbeitet werden, ob der Formationsfaktor auch als Gefügekennwert für Betone mit alternativen Bindemittelsystemen geeignet ist.

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The effects of pore structure on the electrical properties of sand-based porous media

Xie

Yin²,

Pang

et al. 2021

Arab J Geosci

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Empirical time-dependent tortuosity relations for hydrating mortar mixtures based on modified Archie’s law

Cited by 17 publications

References 57 publications

Evaluation of Methods to Correct the Effect of Temperature on Electrical Conductivity of Mortar

Evaluation of Methods to Correct the Effect of Temperature on Electrical Conductivity of Mortar

Zur Anwendbarkeit des Formationsfaktors als Gefügekennwert für Mörtel aus verschiedenen alternativen Bindemittelsystemen

The effects of pore structure on the electrical properties of sand-based porous media

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