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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: Role and Regulation of the Transition Zone in Realizing High Performance Concrete
Author(s): Hiroshi Uchikawa
Publication: Special Publication
Appears on pages(s): 109-130
Keywords: Aggregates; calcium compounds; cement pastes; concretes; drying
shrinkage; durability; permeability; pore-size distribution; strength.
Abstract:The transition zone which is formed at the interface between cement paste and aggregate affects decisively the properties of hardened concrete. The transition zone in ordinary concrete consists mainly of a highly porous three dimensional network structure of calcium hydroxide crystals with pores from 50 nm to 2pm in diameter. Its thickness is usually 30 to 4Opm. The structure of the transition zone is closely related to the conditions of concrete manufacturing, including composition and structure of materials, proportions and curing conditions. The effects on concrete properties by the formation of the transition zone and the measure to reduce the formation of the transition zone, which causes the deterioration of concrete quality, are also described.
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