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City of Everett 01 4523 - 7 <br /> ' Evergreen Branch Library Expansion 2017-008 <br /> 1. Submit 1 test with the mix design. <br /> 2. Submit 1 test each week during course of concrete placement. <br /> 3. Test six cubes each test. 3 cubes with wash water and 3 cubes with potable <br /> water. <br /> 4. Conduct chemical tests, 1 per week during course of concrete placemen <br /> F. Sampling for Concrete Compression Tests: <br /> 1. Take representative samples of fresh concrete conforming to ASTM C172 for <br /> each concrete mix delivered to project. <br /> a. No samples are required for less than 5 cubic yards of concrete. <br /> b. Take one sample for placement of 5 to 25 cubic yards. <br /> c. Take one additional sample for each additional 150 cubic yards. <br /> d. Minimum of one sample each day mix is delivered <br /> ' 2. Make and cure test 4 inch by 8 inch test cylinder specimens conforming to ASTM <br /> C31. <br /> ' G. Concrete Compression Tests of Test Cylinders: <br /> 1. Test to ASTM C39 for each concrete mix conforming to following: <br /> Number of Cylinders to be Tested and Broken <br /> Age at Test(Days) Acceptance Age: 56 Days Acceptance Age: 28 Days <br /> 7 1 1 <br /> 28 2 2 <br /> 56 2 <br /> Hold 1 1 <br /> ' 2. Basis for Compliance: <br /> a. Meet or exceed specified compressive strength for average of 3 <br /> ' consecutive strength tests for each concrete mix. <br /> b. Individual strength test average of 2 cylinders does not fall more than 500 <br /> psi below specified compressive strength. <br /> ' 3. Test Report: Indicate exact mix tested, minimum aggregate size, location and <br /> type of concrete placement, cylinder identification, date of receiving test cylinder <br /> in laboratory, cement brand and type, and admixtures used. <br /> H. In Place Concrete Core Tests: Conduct further testing, at Contractor's expense, of <br /> concrete where cylinder test cylinders fall 500 psi below specified compressive <br /> ' strength or where tests of field-cured cylinders indicate deficiencies in protection or <br /> curing. <br /> 1. Testing Procedure: Test to ASTM C42. Take at least three 2 inch diameter core <br /> samples from concrete placement locations considered questionable as directed <br /> by Architect. <br /> t 2. Damaged Core Samples: Replace samples damaged during removal or <br /> subsequent testing with new core sample. <br /> 01 4523 - 7 TESTING AND INSPECTION SERVICES <br /> 1 <br />