American Concrete Institute, CHAPTER 6 ACI 318/318R-65, BUILDING CODE REQUIREMENTS FOR STRUCTURAL CONCRETE, p. 77, section R6.3.2 — "The code prohibits the use of aluminum in structural concrete unless it is effectively coated or covered. Aluminum reacts with concrete and, in the presence of chloride ions, may also react electrolytically with steel, causing cracking and/or spalling of the concrete."
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