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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: Optimum Steam Curing Procedure in Precasting Plants
Author(s): J. A. Hanson
Publication: Journal Proceedings
Appears on pages(s): 75-100
Abstract:Describes an investigation of the effect of various steam curing procedures on the compressive strength, indirect tensile strength, and elastic properties of concrete, with particular emphasis on steaming procedures compatible with the time requirements of modern prestressing plants. In the usual operation of these plants the time lapse from casting to steam shutoff remains nearly constant at 18 hr. Consequently this investigation generally varied the delay prior to steaming from 1 to 7 hr and the steaming periods from 17 hr down to 11 hr. The rate of steam room temperature increase varied from 20 to 80 F per hr up to three maximum temperatures, 125, 150, and 175 F. The data have shown that optimum values of these characteristics are obtained with a presteaming of approxi-mately 5 hr combined with a temperature rise rate of 40 F per hr up to a constant temperature of about 150 F. A maximum temperature of 175 F provided only moderate additional benefit. This steam curing study has emphatically demonstrated the adverse effect of delays in the neighborhood of only 1 hr. If such early application of steam is required by plant procedure, the temperature rise rate should be limited to 20 F per hr or less.
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