Research Article
Dec 1977
Viscoelasticity of Solidifying Porous Material—Concrete
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VIEW THE REPLYPublication: Journal of the Engineering Mechanics Division
Volume 103, Issue 6
Abstract
The form of the age effect on linear creep and elasticity is established by treating the hydrating cement paste as a variable composite in which the volume fraction of solid grows while the material creeps under load. The formulation rests on three hypotheses: (1)The average strains in microelements solidified at various times are equal; (2)the properties of solidified matter (cement gel) are time-invariant; (3)the rate of migrations of solid particles causing creep in cement gel depends on the mean length of migration passages at the time of load application. The first hypothesis allows eliminating the microstresses from a system of two integral equations set up to relate stress and strain histories. A new form of the creep function is deduced, expressing the aging effect in terms of the growth of volume of cement gel and the increase of the migration passage length. It is shown that the double power law is obtained as a special case when the growth of gel volume is negligible, and a generalization consistent with growing gel volume is suggested and compared with creep data.
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Published In
Journal of the Engineering Mechanics Division
Volume 103 • Issue 6 • December 1977
Pages: 1049 - 1067
Copyright
© 1977 American Society of Civil Engineers.
History
Published in print: Dec 1977
Published online: Feb 3, 2021
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Authors
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Zdeněk P. Bažant, M.ASCE
Prof., Northwestern Univ., Evanston, Ill., and Visiting Scientist, Swedish Cement and Concrete Instit. (CBI), Royal Instil. of Tech., Stockholm, Sweden.
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.