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SITE CONCRETE <br />Section 03000 <br />15-1207 <br />3.12 CONCRETE TESTING <br />A. Comply with CBC Section 1903A, 1905A.3, 1916A and as specified in B. below. Costs of <br />tests will be borne by the Owner. <br />B. Four identical cylinder samples for strength tests of each class of concrete placed each day <br />shall be taken not less than once a day, or not less than once for each 50 cubic yards of <br />concrete, or not less than once for each 2,000 square feet of surface area for slabs or walls. <br />In addition, samples for strength tests for each class of concrete shall be taken for seven-day <br />tests at the beginning of the concrete work or whenever the mix or aggregate is changed. <br />C. Strength tests will be conducted by the Testing Lab on one cylinder at seven (7) days and two <br />cylinders at twenty-eight (28) days. The fourth remaining cylinder will be available for testing <br />at fifty-six (56) days if the 28 -day cylinder test results do not meet the required design <br />strength. <br />D. On a given project, if the total volume of concrete is such that the frequency of testing <br />required by paragraph B. above would provide less than five strength tests for a given class <br />of concrete, tests shall be made from at least five randomly selected batches or from each <br />batch if fewer than five batches are used. <br />E. Cost of retests and coring due to low strength or defective concrete will be paid by Owner and <br />back -charged to the Contractor. <br />F. Each truck shall be tested for slump before concrete is placed. <br />3.13 REMOVAL OF FORMS <br />A. Remove without damage to concrete surfaces. <br />B. Sequence and timing of form removal shall insure complete safety of concrete structure. <br />C. Forms shall remain in place for not less than the following periods of time. These periods <br />represent cumulative number of days during which temperature of air in contact with concrete <br />is 60 degrees F and above. <br />1. Vertical forms of foundations, walls and all other forms not covered below: 5 days. <br />2. Concrete paving edge screeds or forms: 7 days. <br />D. Concrete shall not be subjected to superimposed loads (structure or construction equipment) <br />until it has attained its full design strength and not for a period of at least 21 days after <br />placing. Concrete systems shall not be subjected to construction loads in excess of design <br />loads. <br />3.14 SEALANT <br />A. Sealant Application: Apply sealant in compliance with manufacturer's application instructions, <br />using hand guns or pressure equipment with proper nozzle size, on clean, dry, properly <br />prepared substrates. Force sealants into joint against sides of joint to make uniform. Avoid <br />pulling of the sealant from the sides. Fill sealant space completely with sealant. Finished <br />joints shall be straight, uniform, smooth, and neatly finished. Remove any excess sealant <br />from adjacent surfaces of joint utilizing the manufacturer's recommended solvent and <br />13 <br />