Résumé
L'examen du facteur de facilité de formation d'un gel et du paramètre P de fluage, ce qui inclut les concentrations en volume du gel et de la pâte de ciment, ainsi que l'emploi d'une réaction hyperbolique fluage-temps, ont permis d'élaborer une expression du fluage du type de l'équation (13), qui indique que le fluage est proportionnel au rapport contrainte-résistance et qu'il s'accroît avec le volume du gel et, dans le cas de fluage au séchage, avec le retrait simultané. Les résultats d'essais effectués sur des bétons confectionnés avec un ciment de type I sont présentés et analysés en fonction de l'expression proposée. On montre que la réactivité est plus forte dans des conditions de stockage à l'humidité que dans une atmosphère à 50% h.r. Il faut au moins 100 jours pour que la réactivité s'accomplisse.
Summary
From considerations of the gel compliance factor and of a creep parameter P, involving the volume concentrations of gel and of cement paste, and using a hyperbolic creep-time expression, an expression for creep of the type of Eq. (13) has been derived. This indicates that creep is proportional to the stress-strength ratio, and that it also increases with an increase in the volume of gel and, in the case of drying creep, with concurrent shrinkage. Test results on concretes made with Type I cement are presented and analyzed with respect to the proposed expression. It is shown that creep recovery is higher under wet storage conditions than at a relative humidity of 50%. The time necessary for the recovery to be complete is at least 100 days.
References
Neville, A. M.,—The relation between creep of concrete and the stress-strength ratio. Applied Scientific Research, Section A, vol. 9, 1960, pp. 285–292.
Neville, A. M.—Shrinkage and creep in concrete. Structural Concrete, Vol. 1, March/April 1962, pp. 49–70.
Neville, A. M.—Role of cement in the creep of mortar. Journal, American Concrete Inst., Proc. Vol. 55, March 1959, pp. 963–984.
Neville, A. M., Staunton, M. M., Bonn, G. M. —A study of the relation between creep and the gain of strength of concrete. Symposium on the Structure of Portland Cement Paste and Concrete. Highway Research Board, Special Report No. 90, Washington, D. C., 1966, pp. 186–203.
Ali, I., Kesler, C. E.—Mechanisms of creep in concrete. Symposium on Creep of Concrete. American Concrete Inst., Special Publication No. 9, 1964, pp. 35–57.
Powers, T. C., Brownyard, T. L.—Studies of the physical properties of hardened Portland cement paste (in nine parts). Journal, American Concrete Inst., Proc. Vol. 43, Oct. 1946 to April 1947.
Wallo, E. M., Kesler, C. E.—Prediction of creep in structural concrete. University of Illinois, Dept. of Theoretical and Applied Mechanics, T. & A. M. Report No. 670, Dec. 1966.
Hansen, T. C.—Creep and stress relaxation of concrete. Swedish Cement and Concrete Research Inst., Proceedings No. 31, Stockholm, 1960, 112 p.
Ross, A. D.—Concrete creep data. The Structural Engineer, Vol. 15, Aug. 1937, pp. 314–326.
L'Hermite, R.—Idées actuelles sur la technologie du béton. Documentation Technique du Bâtiment et des Travaux Publics, Paris, 1955.
Powers, T. C.—The physical structure and engineering properties of concrete. Portland Cement Association, Research and Development Laboratories, Research Department Bulletin No. 90, Chicago, July 1958.
Powers, T. C.—The non-evaporable water content of hardened Portland cement paste: its significance for concrete research and its method of determination. A.S.T.M. Bulletin No. 158, May 1949, pp. 68–76.
Neville, A. M.—Creep of concrete as a function of its cement paste content. Magazine of Concrete Research, Vol. 16, No. 46, March 1964, pp. 21–30.
Rutledge, S. E., Neville, A. M.—Influence of cement paste content on creep of lightweight aggregate concrete. Magazine of Concrete Research, Vol. 18, No. 55, June 1966, pp. 69–74.
Neville, A. M.—Properties of concrete. Sir Isaac Pitman and Sons Ltd., London, and John Wiley and Sons Ltd., New York, 1963, reprinted 1965, 532 p.
McIntosh, J. D., Erntroy, H. C.—The workability of concrete mixes with 3/8 in. aggregates. Cement and Concrete Association, Research Report No. 2, London, June 1955.
Neville, A. M.—The measurement of creep of mortar under fully controlled conditions. Magazine of Concrete Research, Vol. 9, No. 25, March 1957, pp. 9–12.
McHenry, D.—A new aspect of creep in concrete and its application to design. A.S.T.M. Proceedings, Vol. 43, 1943, pp. 1069–1084.
Roll, F.—The relations between time-dependent and residual deformations of unsealed concrete, mortar and paste subjected to uniformly distributed stresses. International Conference on the Structure of Concrete, Paper No. H3, London, Sept. 1965.
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Neville, A.M., Ward, M.A. & Kwei, G.C.S. Basic and drying creep of concrete. Mat. Constr. 2, 117–124 (1969). https://doi.org/10.1007/BF02475099
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DOI: https://doi.org/10.1007/BF02475099