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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: CN Tower
Author(s): John A. Bickley, Shondeep Sarkar, and Marcel Langlois
Publication: Concrete International
Appears on pages(s): 51-55
Keywords: air entrainment; calcium hydroxide; calcium-silicate hydrate; carbonation; compressive strength; ettringite; high-performance concrete; microcracking; microstructure; modulus of elasticity; General
Abstract:The CN Tower, Toronto, Ontario, Canada, is the world's tallest freestanding structure at 1805 ft, of which the lower 1500 ft is concrete. The concrete was placed by slipforming in 1973 and 1974. As part of an ongoing inspection program, core samples were obtained and a test program carried out to determine in-place compressive strength, depth of carbonation, modulus of elasticity, and the air-void system. The microstructure was also examined. The results are compared to tests made at the time of construction.
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