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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: Fly Ash and Slag Jet-Blast Resistant Concretes
Author(s): P. J. Robins and S. A. Austin
Publication: Special Publication
Appears on pages(s): 1141-1164
Keywords: airports; fly ash; jet blasts; lightweight aggregates; pavements; slags; spalling; temperature; Materials Research
Abstract:Conventional limestone concrete airfield pavements are prone to spalling as a result of jet blast from vertical take-off and landing aircraft. This paper describes a research program to develop jet blast resistant pavement quality controls containing alternative cementitious materials and aggregates. The concretes were evaluated by subjecting slabs to simulated Harrier jet engine blast, using thermal imaging and video cameras to record surface temperatures, spall times, and spalled areas. Slag and fly ash as partial cement replacement materials produced moderate increases in the surface temperature and exposure time at which spalling initiated. Fly ash aggregates produced substantial improvements in spalling resistance under simulated Harrier conditions, particularly when used to replace both the fine and coarse natural aggregates. The spalling mechanism was associated with differential thermal expansion, as opposed to the release of water vapor and the dehydration of cementitious compounds. Spalling observed during field exposure was attributed to laitance and brushing of the surface, which also suffered from drying shrinkage cracking.
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