Dynamic dielectric analysis during early-stage hydration of ordinary Portland cement

Kim, H C; Yoon, Sukhwan

doi:10.1088/0022-3727/21/7/025

Cited by 9 publications

(4 citation statements)

References 11 publications

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“…The use of dielectric measurements to follow timedependent structural changes is relatively common. Examples exist of its application to crystal transformations (Shablakh et al 1983), physical aging of polymers (Struik 1978), the curing of resins (Sanjana and Selby 1981) and the drying of cement (Kim and Yoon 1988). Because of its non-invasive nature, this technique is particularly suitable to follow the 'drying' process of paints when these are exposed to a typical environment after application.…”

mentioning

confidence: 99%

Power-law decay of conductance during the drying of latex paints

Dissado¹,

Green²,

Hill³

et al. 1989

J. Phys. D: Appl. Phys.

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The drying of latex paint films in a natural environment has been followed by measurements of the AC conductance of the films. Three stages in the drying have been observed with the first two being related to evaporation of water from the bulk of the film, in accordance with mechanical measurements. The third and final stage has been characterised by a power-law decay in the conductance and has been interpreted as the elimination of a percolation network as particles coalesce, thereby cutting the conduction paths.

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mentioning

confidence: 99%

Power-law decay of conductance during the drying of latex paints

Dissado¹,

Green²,

Hill³

et al. 1989

J. Phys. D: Appl. Phys.

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“…It might be interpreted by a more pronounced interface. Moreover, the presence of the peaks is typical of Debye‐type relaxation,43 even if the presence of a depressed semicircle on the Nyquist plot (Figure 7) suggests some deviation from the ideal Debye case.…”

Section: Resultsmentioning

confidence: 99%

Formation of Single‐Layered Double‐Hydroxide Platelets in Poly(vinylpyrrolidone) and Alginate Medium: Conductive, Capacitive, and Dielectric Properties of the Hybrid Films

et al. 2012

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Direct synthesis from an adapted salt coprecipitation of single-crystalline layered double-hydroxide (LDH) platelets can be realized by using polyvinylpyrrolidone (PVP) assisted by an organo-modifying agent, alginate (ALG). The formation of LDH inorganic platelets with a Zn/Al cation composition of 2:1 was demonstrated by TEM observations as well as by a topotactic restacking reaction that used the terephthalate molecule pillaring effect. From the perspective of PVP, LDH platelets can be viewed as hybrid filler. With regards to the inorganic platelets, the dispersive medium supplied by PVP chains in association with the biopolymer is an elegant process for generating single platelets, the whole of which can form an exfoliated polymer nanocomposite structure. The resulting transparent, crack-free PVP films obtained from solvent casting were studied by electrochemical impedance spectroscopy (EIS) to evaluate their conductive, capacitive, and dielectric properties. Single LDH platelets [a]

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“…It may be interpreted by a more pronounced interface. Moreover, the presence of the peaks is typical of Debye‐type relaxation, 45 even if the presence of a depressed semicircle on Nyquist plot (Figs. 1 and 3) suggests some deviation from the ideal Debye case.…”

Section: Discussionmentioning

confidence: 99%

Low-to-Medium-Frequency AC Impedance Spectroscopy Investigations of Nanocrystalline Calcium Silicate Hydrate Dried Powders

Leroux

Russias

Cau-dit-Coumes

et al. 2011

Journal of the American Ceramic Society

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Low-to-medium-frequency range impedance spectroscopy was used to investigate two series of dried calcium silicate hydrates with or without aluminum atoms, C-S-H and C-A-S-H. Over four decades in frequency, sample Nyquist plots were fitted by adopting an equivalent circuit using constant phase elements (CPE). Conductivity values of the order of 10 À9 -10 À10 S/cm were obtained at 316 K. The presence of CPE characteristic of the depleted semicircle at high frequency was related to a fractal dimension ranging from 2.4 up to 2.7. Above 316 K, the impedance spectra behaved unpredictably due to the dehydration process, while below 316 K the behavior was followed by adopting the modulus loss factor. The associated peak maximum variation is of the Arrhenius-type. The entire behavior may be interpreted by ionic motion and charge accumulation in addition to dielectric polarization at the grain boundaries associated to low fractal surface.

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Dynamic dielectric analysis during early-stage hydration of ordinary Portland cement

Cited by 9 publications

References 11 publications

Power-law decay of conductance during the drying of latex paints

Power-law decay of conductance during the drying of latex paints

Formation of Single‐Layered Double‐Hydroxide Platelets in Poly(vinylpyrrolidone) and Alginate Medium: Conductive, Capacitive, and Dielectric Properties of the Hybrid Films

Low-to-Medium-Frequency AC Impedance Spectroscopy Investigations of Nanocrystalline Calcium Silicate Hydrate Dried Powders

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