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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 Construction Of Concrete Arches In Allegheny County, Pennsylvania
Author(s): V. R. Covell
Publication: Journal Proceedings
Appears on pages(s): 653-664
Abstract:Forms for arch ribs and spandrel forms were designed to be transferred practically without modification from one arch to another. Arch forms were built especially tight. Three-ply I/2-in. veneer boards were used to cover 4 x 4-in. lagging and served as the intrados form. 1forms were -in. ton ue-and-groove lumber. All seamsand cracks were fil ed l with sawdust and glue, after which form oil was applied. For winter concreting a 2000-ton bin for the sand and gravel was erected in which I in. perforated steam pipes were placed at an angle of about 45 deg upward.A 230-ton steel bin for measuring and loadmg was erected underneath. The total cost of heating for a daily run of 400 cu yd was about $25. Contractors found it advantageous to use high-early-strength cement in cold weather, which were protected by steam-heated tarpaulins; frequent temperature tests were made by the inspector.
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