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SPECIAL PROVISIONS - SP20I6 BOOK Last Revision by CO Special Provisions: 2/08/17 Created August 20, 2015 Page 43 SP 0202-101 Table 2461-17 Acceptance Criteria for Standard 28-day Cylinders Single Strength Moving average of 3 consecutive strength tests * tests fc<5000psi >(fc-500psi) > f'c fc > 5000 psi > 0.90 * f'c > fc * If a project does not establish a moving average of 3 consecutive strength tests, use the average of 2 strength tests to determine acceptance. If there is only a single strength test, contact the Concrete Engineer for recommendation. S-32.34 MnDOT 2461.3.G.5.f, 2461.3.G.5.f(1), 2461.3.G.5.f(2), 2461.3.G.5.f(3), and 2461.3.G.5.f(4) shall be added: G.5.f Non -Conforming Material If the Contractor places concrete not meeting the strength requirements of 2461.3.G.5.e, "Concrete Compressive Strength" into the work, the Engineer may not accept nonconforming concrete at the contract unit price. The Engineer will evaluate non -conforming strength results in accordance with the following: G.5.f(1) Single Strength Test < 500 psi Below Pc If any single strength test (3 cylinders) shows a strength < 500 psi below fc and is not deficient due to erroneous/invalid strength tests as defined in 2461.3.G.5.f(4), "Moving Average Below fc", no additional investigation will occur and the Engineer will include the low strength test result in the moving average. G.5.f(2) Single Strength Test > 500 psi Below fc If any single strength test (3 cylinders) shows a strength > 500 psi below f'c and is not deficient due to erroneous/invalid strength tests as defined in 2461.3.G.5.f(4), "Moving Average Below fc", the Engineer, in conjunction with the Concrete Engineer, will investigate to determine if the concrete has attained the critical load -carrying capacity. The investigation may consist of, but is not limited to reviewing the following: (1) Sampling and testing plastic concrete (2) Handling of cylinders (3) Cylinder curing procedures (4) Compressive strength testing procedures (5) Certificate of Compliances (6) Evaluation using Rebound Hammer (ASTM C803), Penetration Resistance (ASTM C805), or other method approved by the Concrete Engineer (7) Review of the design calculations for the concrete in question If it is determined that the concrete represented by the single strength test has attained the critical load carrying capacity, the Engineer will include the strength test in the moving average calculation. If it is determined that the concrete has not attained the critical load carrying capacity, the Engineer will direct the Contractor to remove and replace concrete in accordance with 1503, "Conformity with Contract Documents," and 1512, "Unacceptable and Unauthorized Work." The Contractor may dispute the remove and replace order within 7 days of written notification by the Engineer If the Contractor disputes the order, follow the dispute resolution coring procedure in accordance with 2461.3.G.5.f(3), "Dispute Resolution Coring for Single Strength Test Failure." G.5.f(3) Dispute Resolution Coring for Single Strength Test Failure The Engineer and Contractor will mutually agree on an Independent Third Party to core and test the concrete in accordance with ASTM C42.