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The thermal conductivity of fresh concrete

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Summary

The paper reports a transient method of measurement of the thermal conductivity of fresh concrete. Results are presented for conventional and “no fines” concrete. Predictions of temperature distributions using the measured values are illustrated.

Résumé

Cet article décrit le système expérimental utilisé dans la détermination de la conductivité thermique du béton frais par une méthode transitoire; cette méthode est applicable à la majorité des matériaux de construction et le procédé de calcul est décrit. Les avantages de cette méthode sur les méthodes permanentes classiques sont les suivants:

  1. a)

    rapidité

  2. b)

    élimination du transfert d'eau dans l'échantillon.

La méthode a été appliquée à des bétons classique et caverneux sept jours après le coulage et l'on montre que la conductivité thermique du béton classique décroît de 2.17 W.m./m2 0C à 1.52. W. m. /m2 0C au cours de cette période initiale de prise.

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Abbreviations

A:

area

h2 :

thermal diffusivity

k :

thermal conductivity

Q:

heat flux

t :

time

T:

temperature

T r :

temperature rise at the hot face of the slab

x :

distance

d :

thickness

σ:

volumetric specific heat of test specimen

References

  1. Vernotte, P.—C. R. Acad. Sci., Paris, 208, 1937.

  2. Carslaw H.S., Jaeger J. C.—Conduction of heat in solids, Oxford, 1967, p. 113.

  3. Davey N. andFox E. N.—Temperature rise in hydrating concrete. Building Research Technical Paper No. 15.

  4. Klein A., Pirtz D. andAdams R. F.—Thermal properties of mass concrete during adiabatic curing. Paper No. 10, pp. 199–219, Symposium on mass concrete, A.C.I. publication, SP-6, Denver, March 1963.

  5. Javid M. Y.—A study of the temperature distribution in large flat slabs of fresh concrete as a function of environmental condition and time after casting. M.A. thesis, University of Sheffield.

  6. Clark L. N. andKingston R. S. T.—Equipment for simultaneous determination of thermal conductivity and diffusivity of insulating materials, using a variable state method, J. of Applied Science, vol. 1 (2), June 1950.

  7. Pratt A. W.—An improved solution for the determination of thermal conductivity by Vernotte's dynamic method; B.R.S., Research Series 8.

  8. Ball E. F.—A transient heat flow method of measuring thermal conductivity and diffusivity. B. R. S. Researeh Series No. 65.

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Authors and Affiliations

  1. Department of Building Science, University of Sheffield, Sheffield, UK

    T. D. Brown & M. Y. Javaid

Authors
  1. T. D. Brown
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  2. M. Y. Javaid
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Brown, T.D., Javaid, M.Y. The thermal conductivity of fresh concrete. Mat. Constr. 3, 411–416 (1970). https://doi.org/10.1007/BF02478765

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  • DOI: https://doi.org/10.1007/BF02478765

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