Monitoring Setting and Early Hydration of Cement Using Dielectric Spectroscopy

Ng, Shao Ting; Shapiro, Gretta; Mak, S. L.

doi:10.14359/10578

Cited by 1 publication

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“…Since water molecules have a large dipole moment, this method is one of the most reliable methods for the investigation of the state of water in moisture-containing substances. Recently, dielectric measurements of cement paste have been performed to clarify the molecular mechanism of the relaxation processes observed [14][15][16][17][18][19][20][21]. The relaxation process reflecting the motion of free water is observed in the GHz region [21][22][23][24][25][26], and the intensity of this process decreases with the progress of curing.…”

Section: Introductionmentioning

confidence: 99%

Nondestructive observation of state of water in concrete using dielectric spectroscopy

Sudo,

Sato,

Kurihara

et al. 2023

Meas. Sci. Technol.

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We present a method of observing the relaxation process reflecting the motion of water molecules masked by the contribution of electrical conduction. By using this method, we can observe the Cole−Cole-type relaxation process reflecting the motion of the bound water molecules in cement-based materials. The relaxation time and strength of this process increase with curing time, and both parameters saturate to a constant value. The curing time dependence of compressive strength can be described by a logarithmic function, and the change in compressive strength correlates strongly with the change in relaxation time. In the analysis using the τ-βCC diagram, the trajectory of the τ-βCC diagram shifts to the lower right as the curing progresses, and the feature of the trajectory of the τ-βCC diagram depends on the difference in the wetting environment. Our results indicate that the state of water retained in the pore structure can be used as a probe to obtain information on the curing progress of concrete.

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