| http://www.w3.org/ns/prov#value | - Structural concrete shall conform to the durability requirements of ACI 318.EXCEPTION:For Group R-2 and R-3 occupancies not more than three stories above grade plane, the specified compressive strength, f'c, for concrete in basement walls, foundation walls, exterior walls and other vertical surfaces exposed to the weather shall be not less than 3000 psi.1904.2 Nonstructural concrete.
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