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' <br /> b. Air Content: ASTM C 173, volumetric in.ethod for lightweight or normal ' <br /> weight concrete; ASTM C 231, pressure method for normal weight <br /> concrete;one for each day's pour of each type of air-entrained concrete. <br /> c. Concrete Temperature: ASTM C lt}64; one test hourIy when air ' <br /> temperature is 40 deg� (4 deg C) and below, when 80 deg F (27 deg C} <br /> and above,aud one test for each set of compressive,-strengt�specimens. <br /> d. Compression Test Specimen: ASTM C 31; one set of four standard <br /> cyiinders for each compressive-strength test, unless otherwise directed. ' <br /> Mold and store cylinders for laboratory-cured test specimens except when <br /> field-cured test specunens are required. <br /> e. Compressive-Strength Tests: ASTM C 39; one set for each day's pour t <br /> exceeding 5 cu. yd. plus additionai sets for each 50 cu. yd. more than the <br /> first 2S cu.yd, of each conarete class placed in any one day;one specimen <br /> tested at 7 days, two specimens tested at 28 days, and one specimen ' <br /> retained in reserve for later testing if required. <br /> £. When total quantity of a given class of concrete is iess thar� 50 cu. yd., <br /> Architect may waive strength testing if adequate evidence of satisfactory <br /> sirength is provided. � <br /> C. Test results will be reported in writing to Architect, ready-mix producer, and Contractor <br /> witiiin 24 hours after tests. Reports of compressive strength tests shail contain the Project <br /> identification name and number, date of concrete placement, name of concrete testing ' <br /> service,concrete iype and class,location of concrete batch in struoture,design compressive <br /> strength at 28 days,concrete mix proportions and materials,compressive breaking strength, <br /> and type of break for both 7-day tests and 28-day tests. ' <br /> END�F SECTION 03300 <br /> t <br /> ' <br /> 1 <br /> 1 <br /> ' <br /> 1 <br /> , <br /> ' <br /> ' <br /> CONCRETE Page 8 of 8 ' <br />