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Gateway Park Center PERKINS+WILL <br /> 810495.00 <br />12/06/18 <br />033000-13 Cast-In-Place <br />Concrete <br />vii.Monitor consistency and uniformity of concrete. <br />viii.Monitor preparation for concreting operations, placement <br />of concrete, and subsequent curing period for <br />conformance with Specifications for following procedures: <br />(1)Concrete curing. <br />(2)Hot weather concreting operations. <br />(3)Cold weather concreting operations. <br />3.Owner’s Testing Agency shall conduct tests of concrete as follows and in <br />accordance with ASTM C 1077: <br />a)Testing frequency: Sample sets for all tests listed below of each <br />concrete design mix placed each day shall be taken not less than <br />once a day, nor less than once for each 100 cubic yards of <br />concrete, nor less than once for each 5000 square feet of surface <br />area for slabs or walls. Additional tests shall be performed if <br />deemed necessary by the Owner’s Testing Agency and Design <br />Professionals. In addition, sample each truckload used for <br />columns, regardless of other frequencies listed above. <br />b)Obtain each test sample from different batches selected on a <br />strictly random basis before commencement of concrete <br />placement. Record location in structure of sampled concrete. <br />c)Determine air content of normalweight concrete in accordance <br />with either ASTM C 231 or ASTM C 138. Determine air content of <br />lightweight concrete in accordance with ASTM C 173. Conduct <br />one test for air content for each strength test required or for every <br />50 cubic yards (40 cubic meters) of fly ash concrete placed, <br />whichever is less. <br />d)Test water content of freshly mixed concrete on a random basis, a <br />minimum of once per 100 cubic yards or every 5000 square feet of <br />concrete placement, during placement in accordance with <br />AASHTO T 318 for the following concrete types: <br />i.Hard troweled slabs exposed to view <br />ii.Slab to receive a bonded finish floor material <br />iii.Slabs with specified concrete compressive strength <br />exceeding 6000 psi <br />e)Conduct slump tests in accordance with ASTM C 143. <br />f)Slump indicated in mix designs shall be achieved at point of <br />placement. Correlation between slump at point of initial discharge <br />from truck and point of placement must be established to <br />determine amount of slump loss which occurs between initial <br />discharge and point of placement. Adjustment may be necessary <br />to achieve slump indicated in mix designs at point of placement. <br />g)Conduct strength tests of concrete as follows: <br />i.Secure sample sets in accordance with ASTM C 172.