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Study of dielectric and electrical properties of mortar in the early hydration period at microwave frequencies

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Abstract

The dielectric constant, ɛ, and electrical conductivity, σ, of mortars with various sand-cement ratios,s/c, were measured for the first 30 h hydration using microwave techniques in the frequency range 8.2–12.4 GHz. The ɛ and σ of the mortars were found to increase linearly with increasing water-solid ratiow/(s + c), but decrease with increasings/c. It was found that as long as thes/c values were the same, the rate of changes in ɛ and σ of the mortars were the same. It appears that thes/c is the key factor controlling the rates of changes in dielectric and electrical parameters of cement hydration in mortar. The relationship between compressive strength and dielectric and electrical properties of mortars was also discussed.

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Authors and Affiliations

  1. Department of Physics, National University of Singapore, 0511, Singapore

    X. Z. Ding, X. Zhang, C. K. Ong & B. T. G. Tan

  2. Ssang Yong Cement (Singapore) Limited, 17 Pioneer Crescent, 2262, Singapore

    J. Yang

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  1. X. Z. Ding
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  2. X. Zhang
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  3. C. K. Ong
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  4. B. T. G. Tan
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Ding, X.Z., Zhang, X., Ong, C.K. et al. Study of dielectric and electrical properties of mortar in the early hydration period at microwave frequencies. J Mater Sci 31, 5339–5345 (1996). https://doi.org/10.1007/BF01159302

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  • DOI: https://doi.org/10.1007/BF01159302

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