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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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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: The Camera Lucida Method for Measuring Air Voids in Hardened Concrete
Author(s): George J. Verbeck
Publication: Journal Proceedings
Appears on pages(s): 1025-1040
Abstract:The camera Lucida method for the determination of the air content and the air void characteristics of hardened cement pastes, mortars, and concretes is described. Data are included to demonstrate the influence of experimental factors on the results obtained by the camera lucida method. A comparison is made of the void concentrations and averaae void areas of the air entrained bv different types of agents and under different mixing conditions. No factors significantly alterinq the void characteristics in concrete are revealed in the tests thus far made. The air contents of hardened concretes as determined by the camera lucida method com-pare satisfactorily with results obtained by other methods applied to the same concretes when in the plastic state.
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