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REPRODUCED AT GOVERNMENT EXPENSE, 0 1.2 GENERAL REQUIREMENTS: In the ACI publications referred to herein, the advisory provisions shall be considered to be mandatory, as though the word "shall" has been substituted for "should" wherever it appears: reference to the "Building Official," the "Structural Engineer," and the "Architect/Engineer" shall be interpreted to mean the Contracting Officer. 1.3 SUBMITTALS: None required. 1.4 DELIVERY: Do not deliver concrete until ready for concrete placement. 1.5 STORAGE: Store concrete aggregates to prevent contamination or segregation. Store reinforcement of different sizes and shapes in separate piles or racks raised above the ground to avoid excessive rusting. Protect from contaminants such as grease, oil, and dirt. Provide for accurate identification after bundles are broken and tags removed. PART 2 - PRODUCTS 2.1 CONCRETE: 2.1.1 Concrete Mix Design: ACI 301, except as modified herein. Concrete shall have a 28 -day compressive strength of 3000 Psi. Slump shall be between 2 and 4 inches in accordance with ASTM C 143. The slump may be increased to 5 inches for concrete utilizing either fly ash, pozzolan, or ground slag for 20 percent (minimum) of the total cementitious material. Provide ASTM C 33 aggregate Size No. 67 and 4 to 6 percent air entrainment for concrete exposed to freeze -thaw conditions. Accomplish air -entrainment using an air - entraining admixture. 2.1.2 Ready -Mixed Concrete: ASTM C 94, except as modified herein. Ready - mixed concrete is defined in this specification as concrete produced regularly by a commercial establishment and delivered to the purchaser in the plastic state. 2.2 MATERIALS: 2.2.1 Cement: ASTM C 150, Type I or ASTM C 595, Type IPMS blended cement, except as modified herein. The blended cement shall consist of a mixture of ASTM C 150 cement and one of the following materials: ASTM C 618 pozzolan or fly ash, or ASTM C 989 ground iron blast furnace slag. The pozzolan/fly ash content shall not exceed 25 percent by weight of the total cementitious material. For exposed concrete, use one manufacturer for each type of cement, ground slag, fly ash, and pozzolan. 2.2.1.1 Fly Ash and Pozzolan: ASTM C 618, Type N, F, or C, except that the maximum allowable loss on ignition shall be 6 percent for Type N and F. Add with cement. 2.2.1.2 Ground Iron Blast -Furnace Slag: ASTM C 989, Grade 100 or 120. 2.2.2 Water: Water shall be potable.