Theoretical Prediction of Drying Shrinkage of Concrete
Publication: Journal of Materials in Civil Engineering
Volume 7, Issue 4
Abstract
The water potential that controls moisture movement in concrete is a kind of stress that also causes concrete to shrink and to expand. An explicit equation that shows the relationships between water potential and drying shrinkage was derived through a mathematical process. In this study, only two micromechanisms that are valid when the relative humidity is over 50% are considered among the three shrinkage mechanisms. The theory developed shows that the magnitude and the shape of the drying-shrinkage curve depends on the compressibility of the ingredients, the amount of aggregate, and the pore structure of the cement. The relationship between drying shrinkage and water potential is found to be a logarithmic curve. Thermocouple psychrometers are embedded in a concrete slab to measure the water potential. The test results prove the validity of the theory, and show how to use the derived equation.
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References
1.
Brown, R. W. (1970). “Measurement of water potential with thermocouple psychrometers: Construction and applications.”Res. Paper INT-80, U.S.D.A. Forest Service.
2.
Kirkham, D., and Powers, W. L. (1972). Advanced Soil Physics . Wiley-Interscience, New York, N.Y.
3.
Nilson, L. O. (1980). “Hygroscopic moisture in concrete-drying measurements and related material properties.” Div. of Build. Mat., Res. Rep. TVBM-1003, Inst. of Technol. of Lund, Lund, Sweden.
4.
Pickett, G.(1956). “Effect of aggregate on shrinkage of concrete and a hypothesis concerning shrinkage.”ACI J., 27(5), 581–590.
5.
Pihlajavaara, S. E. (1982). “Estimation of drying of concrete at different relative humidities and temperature of ambient air with special discussion about fundimental feature of drying and shrinkage.”Creep and shrinkage in concrete structures, Z. P. Bažant and F. H. Wittmann, eds., John Wiley & Sons, Ltd., New York, N.Y., 87–107.
6.
Powers, T. C. (1965). “Mechanisms of shrinkage and reversible creep of hardened cement paste.”Proc., Int. Conf. on the Struct. of Concrete, London, Cement Concrete Assoc., 319–344.
7.
Powers, T. C.(1968). “The thermodynamics of volume change and creep.”Materiaux et Constructions, 1(6), 487–507.
8.
Vos, B. H. (1971). “Moisture migration in concrete.” in First Int. Conf. on structural mechanics in reactor technology, Paper H2/5, Berlin, Germany.
9.
Young, J. F. (1982). “The microstructure of hardened portland cement paste.”Creep and shrinkage in concrete structures, Z. P. Bažant and F. H. Wittmann, eds., John Wiley & Sons, Ltd., New York, N.Y., 3–22.
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Copyright © 1995 American Society of Civil Engineers.
History
Published online: Nov 1, 1995
Published in print: Nov 1995
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