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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Porosity of Hardened Portland Cement Pastes
Author(s): L. E. Copeland and J. C. Hayes
Publication: Journal Proceedings
Appears on pages(s): 633-640
Keywords: no keywords
Abstract:Continued study of the properties of hardened portland cement pastes has provided information which makes it possible to estimate porosity of pastes more precisely than is possible by using the original equations of Powers and Brownyard. The total pore volume of hardened pastes is 0.99 we. Capillary pore volume is the difference between total pore volume and pore volume characteristic of the gel in hardened pastes. The pore volume of the gel is assumed to be the lowest pore volume that has been observed in hardened pastes. The paste with the lowest pore volume was made with w,/c = 0.235 and cured for 11 years. The gel porosity calculated for this paste is 0.26. The average number of layers of water molecules on the surface of this saturated gel is 2.38.
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