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Air Content: ASTM C 173; volumetric method for lightweight or normal weight concrete; ASTM C 231; pressure method for normal weight concrete; one for each day's pour of each type of air - entrained concrete. Compression Test Specimen: ASTM C 31; one set of 5 standard cylinders for each compressive strength test unless otherwise directed. Mold and store cylinders for laboratory cured test specimens except when field -cure test specimens are required. I� Compressive Strength Tests: ASTM C39; one set for each day's pour for each 50 cu. yds., or fraction thereof, of each concrete class placed in any one day; two specimens tested at 7 days, two specimens tested at 28 days, and one specimen retained in reserve for later testing if required. When frequency of testing will provide less than 5 strength tests for a given class of concrete, conduct testing from at least 5 randomly selected batches or from each batch if fewer than 5 are used. I� When total quantity of a given class of concrete is less than 50 cu. yds., strength test may be waived by ENGINEER if, in his judgement, adequate evidence of satisfactory strength is provided. When strength of field -cured cylinders is less than 85 percent of companion laboratory-cured cylinders, evaluate current operations and provide corrective procedures for protecting and curing the in -place concrete. Strength level of concrete will be considered satisfactory if the averages of sets of three consecutive strength test results equal or exceed specified compressive strength. No individual strength test result fall below specified compressive strength by more than 500 psi. " Test Results will be reported in writing to ENGINEER and CONTRACTOR within 24 hours after tests. Reports of compressive strength test shall contain the project identification name and number, date of concrete placement, name of concrete testing service, concrete type and class, TS -16 RJCIOBIa31SUNNY ISLESITECHSPECS