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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: Freeze-Thaw Durablity Versus Freezing Rates
Author(s): Michel Piaeon. Jacaues P&ost, and Jean-Marc Simard
Publication: Journal Proceedings
Appears on pages(s): 684-692
Keywords: air-entrained concretes; air entrainment; concretes; freeze-thaw durability; freezing; measurement; microcracking; pore water pressure; water-cement
Abstract:Non-air-entrained and air-entrained concretes with varying air-void systems were submitted to-300 freeze-thaw cycles in air at 100 percent relative humidity at freezing rates of 4 and 6 C/h. Length change and pulse velocity variation were used as indicators of concrete deterioration. For a water-cement ratio of 0.5, the critical air-void spacing factor (the value below which concrete will be minimally damaged at 300 freeze-thaw cycles) was determined to be 630 ,urn for a freezing rate of 4 C/h and 450 ,am for 6 C/h. Considering previously published data by the first author for a freezing rate of 2 C/h, the relationship between critical air-void spacing factor and rate of freezing was established. It shows that the freezing rate has a significant influence on freeze-thaw durability. The change in the value of the critical air-void spacing factor from 680 ,um at 2 C/h to 450 pm at 6 C/h is in agreement with the equations from Powers’ hydraulic pressure theory. In the tests described, almost no scaling was observed. Deterioration was always in the form of internal cracking. For a good number of specimens, length changes of more than 1 percent were measured.
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