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American Concrete Institute. A nonprofit scientific and educational society, organized in 1904, to represent the user interest in the concrete field. ACI defines “user” as “the public agency, engineer, architect, owner, contractor, educator, or other specialist interested in the design, construction or maintenance of concrete structures.” ACI’s purpose is “to provide a comradeship in finding the best ways to do concrete work of all kinds and in spreading that knowledge.” (from the ACI website)