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Difference of the W/C ratio, porosity and microscopical aspect between the upper boundary paste and the lower boundary paste of the aggregate in concrete

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Abstract

The author compared the W/C ratio, pore volume and microscopical aspect of the upper paste of coarse aggregate with those at the lower paste. Based on experiments using red ink, it can be said that the W/C ratio is partially increased near the lower surface of coarse aggregate in concrete. The total pore volume of the hardened paste near the lower surface of coarse aggregate is confirmed to be larger than that near the upper. With a scanning electron microscope, a larger number of fragile calcium hydroxide crystals was observed near the lower boundary of coarse aggregate than near the upper.

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References

  1. Powers, T.C., in ‘The Chemistry of Cement’, edited by H.F.W. Taylor (Academic, London, 1964) 391–395.

    Google Scholar 

  2. Helmuth, R.A. and Verbeck, G.J., ‘Structures and physical properties of cement paste’, in Proceedings of 5th International Symposium on Chemistry of Cement (Academic Press), Tokyo, October 1968, pp. 1–5.

  3. Wischer, G., ‘Schrifttenreihe der Zementindustrie’, Vol. 28 (Verein Deutsche Zement-Werke, Düsseldorf, 1963).

    Google Scholar 

  4. Knudsen, F.P., ‘Dependence of mechanical strength of brittle polycrystalline specimens on porosity and grain size’,J. Amer. Ceram. Soc. 42(8) (1959) 376–387.

    Article  Google Scholar 

  5. Takano, S., ‘Investigation on the effect of placing temperature upon the strength of mass concrete’.Proc. Jpn Soc. Civil Eng. No. 26 (1955) 1–56.

    Google Scholar 

  6. Kondo, R., ‘Effects of the pore structure in paste on the rate of hydration and mortar strength of C3S, Alite and their solid solutions.Proc. Cem. Assoc. Jpn No. 23 (1969) 76–80.

    Google Scholar 

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Authors and Affiliations

  1. Department of Architectural Engineering, Hokkaido Institute of Technology, Sapporo Nishiku Teine, 419-2, Maeda, Japan

    M. Hoshino

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  1. M. Hoshino
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Hoshino, M. Difference of the W/C ratio, porosity and microscopical aspect between the upper boundary paste and the lower boundary paste of the aggregate in concrete. Materials and Structures 21, 336–340 (1988). https://doi.org/10.1007/BF02472159

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  • DOI: https://doi.org/10.1007/BF02472159

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