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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: Creep in Spirally Prestressed Concrete Cylinders
Author(s): C. W. Martin
Publication: Journal Proceedings
Appears on pages(s): 224-232
Keywords: concretes;creep properties;high-strength concretes;prestressed concrete; prestressing steels;research;spiral reinforcement;stresses;triaxial loads.
Abstract:Experiments with 18 spirally prestressed concrete cylinders are discribed. Spiral prestressing volume was 1.9 percent of concrete volume and initial laterla stress was 2100 psi (148 kg/cm^2). Specimens were subjected to sustained axial stresses from 17 to 83 percent of ultimate for up to 183 days. Strength was increased up to 19 percent by exposure to triaxial stress and reached 29.6 ksi (2080 kg/cm^2). Creep rupture is likely at axial stress greater than 80 percent of short-itme ultimate strength but specimens at 73 percent and 60 percent of ultimate were safe from creep rupture. Working stress of 8 ksi (562 kg/cm^3) appears feasible.
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