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' 40-27 BUILDING PRECAST CONCRETE <br />BRPH ARCHITECTS -ENGINEERS, INC. <br />2.13 SOURCE QUALITY CONTROL <br />A. Quality -Control Testing: Test and inspect precast concrete according to PCI MNL 117 <br />requirements. If using self -consolidating concrete, also test and inspect according to <br />PCI TR-6, "Interim Guidelines for the Use of Self -Consolidating Concrete in <br />Precast/Prestressed Concrete Institute Member Plants." <br />' <br />B. Strength of precast concrete units will be considered deficient if units fail to comply with <br />ACI 318 requirements for concrete strength. <br />C. Testing: If there is evidence that strength of precast concrete units may be deficient or <br />' <br />may not comply with ACI 318 requirements, precaster will employ an independent <br />testing agency to obtain, prepare, and test cores drilled from hardened concrete to <br />determine compressive strength according to ASTM C 42/C 42M. <br />' <br />1. A minimum of three representative cores will be taken from units of suspect <br />strength, from locations directed by Engineer. <br />2. Cores will be tested in an air-dry condition. <br />3. Strength of concrete for each series of 3 cores will be considered satisfactory if <br />average compressive strength is equal to at least 85 percent of 28-day design <br />compressive strength and no single core is less than 75 percent of 28-day design <br />compressive strength. <br />4. Test results will be made in writing on same day that tests are performed, with <br />copies to Engineer, Owner's Representative, Contractor, and precast concrete <br />fabricator. Test reports will include the following: <br />a. Project identification name and number. <br />b. Date when tests were performed. <br />C. Name of precast concrete fabricator. <br />d. Name of concrete testing agency. <br />e. Identification letter, name, and type of precast concrete unit(s) represented <br />by core tests; design compressive strength; type of break; compressive <br />strength at breaks, corrected for length -diameter ratio; and direction of <br />' <br />applied load to core in relation to horizontal plane of concrete as placed. <br />D. Patching: If core test results are satisfactory and precast concrete units comply with <br />requirements, clean and dampen core holes and solidly fill with precast concrete <br />mixture that has no coarse aggregate, and finish to match adjacent precast concrete <br />surfaces. <br />PART 3 - EXECUTION <br />I3.1 EXAMINATION <br />A. Examine supporting structural frame or foundation and conditions for compliance with <br />requirements for installation tolerances, true and level bearing surfaces, and other <br />conditions affecting performance. <br />' C06922.001.00 03 45 00 - 9 <br />05-22-14 <br />i <br />