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INDIAN RIVER COUNTY JULY 25, 2014 <br />INTERGENERATIONAL RECREATION CENTER 100% CONSTRUCTION DOCUMENTS <br />3. Verification of use of required design mixture. <br />4. Concrete placement, including conveying and depositing. <br />5. Curing procedures and maintenance of curing temperature. <br />6. Verification of concrete strength before removal of shores and forms from beams and <br />slabs. <br />C. Concrete Tests: Testing of composite samples of fresh concrete obtained according to <br />ASTM C 172 shall be performed according to the following requirements: <br />1. Testing Frequency: Obtain one composite sample for each day's pour of each concrete <br />mixture exceeding 5 cu. yd., but less than 25 cu. yd., plus one set for each additional 50 <br />cu. yd. or fraction thereof. <br />2. Testing Frequency: Obtain at least one composite sample for each 100 cu. yd. or <br />fraction thereof of each concrete mixture placed each day. <br />a. When frequency of testing will provide fewer than five compressive -strength tests <br />for each concrete mixture, testing shall be conducted from at least five randomly <br />selected batches or from each batch if fewer than five are used. <br />3. Slump: ASTM C 143/C 143M; one test at point of placement for each composite sample, <br />but not less than one test for each day's pour of each concrete mixture. Perform <br />additional tests when concrete consistency appears to change. <br />4. Air Content: ASTM C 231, pressure method, for normal -weight concrete; <br />ASTM C 173/C 173M, volumetric method, for structural lightweight concrete; one test for <br />each composite sample, but not less than one test for each day's pour of each concrete <br />mixture. <br />5. Concrete Temperature: ASTM C 1064/C 1064M; one test hourly when air temperature is <br />40 deg F and below and when 80 deg F and above, and one test for each composite <br />sample. <br />6. Unit Weight: ASTM C 567, fresh unit weight of structural lightweight concrete; one test <br />for each composite sample, but not less than one test for each day's pour of each <br />concrete mixture. <br />7. Compression Test Specimens: ASTM C 31/C 31M. <br />a. Cast and laboratory cure two sets of two standard cylinder specimens for each <br />composite sample. <br />b. Cast and field cure two sets of two standard cylinder specimens for each <br />composite sample. <br />8. Compressive -Strength Tests: ASTM C 39/C 39M; test one set of two laboratory -cured <br />specimens at 7 days and one set of two specimens at 28 days. <br />a. Test one set of two field -cured specimens at 7 days and one set of two specimens <br />at 28 days. <br />b. A compressive -strength test shall be the average compressive strength from a set <br />of two specimens obtained from same composite sample and tested at age <br />indicated. <br />9. When strength of field -cured cylinders is less than 85 percent of companion laboratory - <br />cured cylinders, Contractor shall evaluate operations and provide corrective procedures <br />for protecting and curing in-place concrete. <br />10. Strength of each concrete mixture will be satisfactory if every average of any three <br />consecutive compressive -strength tests equals or exceeds specified compressive <br />CAST -IN-PLACE CONCRETE 033000 - 20 <br />