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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: Frost Action on Immature Cement Paste -Microstructural
Author(s): Obada A. Kayyali, Christopher L. Page, and Alistair G. B. Ritchie
Publication: Journal Proceedings
Appears on pages(s): 264-268
Keywords: air entrainment; cement pastes; compressive strength; cracking
(fracturing); freeze-thaw durability; freezing; hydration; mechanical properties;
Abstract:Microstructural features, associated with the irreversible loss in strength experienced‘ by immature plain cement paste when exposed briefly to freezing and thawing conditions, have been examined. An important factor is believed to be the formation of large, easily-cleaved portlandite crystals surrounded by stress-intensifying pores. Air-entrained paste, however, contained air voids into which segregation of portlandite occurred during early freezing and thawing. This is thought to have led to reduction in the quantity of portlandite deposited in the body of the paste when normal curing was resumed, and may account for the enhanced strength and toughness values recorded for such specimens.
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