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2. Compression test specimens: ASTM C31; one set of three standard <br />cylinders for each compressive strength test. <br />3. Compressive strength tests: ASTM C39; one set for each 50 cubic <br />yards, or fraction thereof, of each concrete class and type in any one <br />' day; one specimen tested at seven days; and two specimens tested <br />at 28 days. <br />4. <br />Core tests: Core samples of in -place concrete will be made when <br />cylinder breaks are such that there is reasonable doubt that the <br />specified concrete strengths have been attained in the structure. <br />Tests will be conducted to determine the strength and other <br />characteristics of the in -place concrete in accordance with ASTM <br />C42, by load testing or analysis as specified in ACI 318, or other <br />' <br />tests as required. The cost of core test taken to determine the <br />specified concrete strength in lieu of acceptable cylinder breaks shall <br />be paid by the contractor. <br />' <br />5. <br />Workmanship: Concrete work which does not conform to the <br />specified requirements, including strength, color, tolerances, and <br />1 <br />finishes, shall be corrected or replaced at no cost to the owner. <br />G. Samples <br />1. <br />Engineer's samples: Samples of finishes acceptable to the Engineer <br />p P 9 <br />' <br />are available for review by the Contractor before starting work. <br />Coordinate procurement and selection of materials and design, <br />mixing, placing and finishing of concrete, to obtain acceptable color <br />' <br />and finish in completed work. <br />2. <br />Formwork samples: Provide formwork for mock -up or sample <br />panels as required for cast -in -place concrete work specified. <br />' <br />Construct forms using facing materials required to provide specified <br />finishes and textures. Do not proceed with structure formwork until <br />sample units and forms have been accepted by the Engineer. <br />3. <br />Field constructed samples: Fabricate sample sections <br />representative of specified finished surfaces, in locations designated <br />by the Engineer. Form, reinforce, mix, cast, cure and finish sample <br />units using materials and methods proposed for construction work. <br />' <br />Provide sample sections as follows: <br />a. Wall section, approximately four feet high by four feet wide by <br />six inches thick, unless otherwise shown. Form faces shall <br />represent AF3 finish. Provide a safe footing and temporary <br />bracing as needed to prevent the accidental tilt -over of the <br />07/06 <br />03300 -4 05 -5564 <br />