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SPECIAL PROVISIONS - SP20I6 BOOK Last Revision by CO Special Provisions: 2/08/17 Moving average of 3 consecutive strength tests >93.0%off'c > 87.5% and < 93.0% of fc <87.5%offc Created August 20, 2015 Page 45 SP 0202-101 Table 2461-19 All Concrete Grades Monetary Reduction for Moving Average Failure * $20.00 per cubic yard or 10% of the Contractor -provided invoice for quantity represented by test that brought moving average into non-conformance $50.00 per cubic yard or 25% of the Contractor -provided invoice for quantity represented by test that brought moving average into non-conformance Remove and replace concrete in accordance with 1503, "Conformity with Contract Documents," and 1512, "Unacceptable and Unauthorized Work," as directed by the Engineer. If the Engineer, in conjunction with the Concrete Engineer, determines the concrete can remain in place, the Engineer will adjust the concrete at a reduction of $100.00 per cubic yard or 50% of the Contractor -provided invoice for quantity represented by test that brought moving average into non-conformance. S-32.35 MnDOT 2461.3.G.6.a and 2461.3.G.6.a(1) shall be deleted and replaced with the following: G.6.a Development of Maturity -Strength Relationship The Engineer will allow development of the maturity curve in either the laboratory or in the field, provided the precautions for field curing and testing are followed, as described in the Concrete Manual. Test the concrete strength specimens for development of the maturity curve. Determine the strength development criteria based on the type of concrete in accordance with the following: (1) For concrete pavement: 2301.3.0, "Opening Pavement to Traffic," (2) For concrete pavement repairs: 2302.3.B.4, "Opening to Construction Equipment and Traffic," (3) For concrete structures: 2401.3.G, "Concrete Curing and Protection" (4) For sidewalks, driveway entrances and curb and gutter, a minimum of 3000 psi [20.6 MPa] is required. Until an acceptable strength -maturity relationship is established, verify strength using concrete beams or cylinders. G.6.a(1) Procedure Estimate the in -place concrete strength using the maturity method as described in ASTM C 1074, except as noted in this specification as follows: (a) Fabricate 15 cylinders plus 2 additional cylinders to embed temperature sensors or 15 beams; (b) The Nurse -Saul method of computing maturity; (c) A datum temperature of -10°C (14°F); (d) Maintain specimens at temperatures greater than 50° F for the duration of the maturity curve development. Test three (3) strength specimens at five different ages specified in Table 2461-20 for the type of concrete work.