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SPECIFICATION NUMBER: <br /> CHm, �xMolybdE;'nuoi CONCRETE CONSTRUCTION 03 30 00 SPE <br /> AFrseport-MdWoRanCompany TECHNICAL SPECIFICATION PROJECT NAME: <br /> CAVR Shaft Closure Project <br /> 3.01 DESIGN OF CONCRETE MIX AND CONCRETE SUPPLY <br /> i <br /> A. General <br /> 1. All concrete shall be ready-mixed concrete manufactured and delivered in <br /> accordance with the requirements of ASTM C94,Option A. The Contractor <br /> shall assume the responsibility for the design of the concrete mix. Design <br /> of the concrete mix to fulfill job requirements shall comply with ACI 301 <br /> and may be done either on the basis of previous field experience, existing <br /> trial mixtures or new trial mixtures. Proportioning of the new concrete mix <br /> g shall not be done based on empirical data. The design of the concrete mix <br /> shall be in accordance with ACI 211.1 to attain the properties of strength, <br /> slump, entrained air, and water-cement ratio in conformance with the <br /> following requirements. <br /> B. Proportioning <br /> t 1. The concrete mix design shall have the following properties: <br /> Mix Parameter: Value <br /> Slump: 4 inches+- I-inch(in accordance with ACI 301) <br /> Maximum Coarse Aggregate Size: 3/4-inch <br /> Coarse Aggregate Gradation: ASTM C33,Size No.67 <br /> Required Percent Range Air 5-8 /o o <br /> Entrainment: <br /> Maximum Water/Cement Ratio 0.48 <br /> by weight: <br /> Design Strength(28 days): 6,000 psi <br /> 2. The proportion of materials shall be selected to produce the proper <br /> r placeability, pumpability, durability, strength and other required properties. <br /> Proportions shall be such as to produce a mixture which will work easily <br /> into the corners and angles of the forms and around reinforcement. <br /> 3. The determination of the water-cement ratio to attain the required strength <br /> and/or durability shall be in accordance with AC1 301 and with ACI 211.1. <br /> t <br /> C. Correction of Proportions <br /> 1. Prior to concreting operations, the Contractor shall establish minimum <br /> standards of proportions for all the types of concrete to be used on the <br /> LL project. Concrete operations shall proceed with these mix designs, but if at <br /> any time the tests of job concrete indicate failure to meet the strength, <br /> 114-910345 CONCRETE CONSTRUCTION <br /> Climax CAVR Shaft Closure Project 03 30 00 SPE-11 <br />