Agenda - Council - 06/27/2017 - Laserfiche WebLink

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SPECIAL PROVISIONS - SP20I6 BOOK Last Revision by CO Special Provisions: 2/08/17 Created August 20, 2015 Page 46 SP 0202-101 Table 2461-20 Chronological Testing Ages of Strength Specimens Type of Concrete Testing Ages * Concrete Pavement as defined in 2301 Determined by the Contractor 11 Normal Strength Concrete as defined in 2461 1, 2, 3, 7 and 28 days High -Early (HE) Concrete as defined in 2461 12 hours, 1, 2, 7 and 28 days Ultra High -Early (UHE) Concrete as defined in 2302 3, 4 and 8 hours, 1 and 14 days * The Contractor may adjust the testing ages if approved by the Engineer, in conjunction with the Concrete Engineer II Test at least two (2) sets of strength specimens before the anticipated opening strength. S-32.36 The first paragraph of MnDOT 2461.3.G.6.c shall be deleted and replaced with the following: Perform a verification strength test to ensure the in place concrete strength correlates with the maturity -strength relationship as follows: (1) Notify the Engineer at least 24 hours in advance of the time and location of both the verification specimen's casting and strength testing. (2) When the maturity curve is developed prior to the start of construction or in a laboratory, perform a verification strength test on the first day of concrete placement. (3) Perform a verification strength test at least once every seven (7) calender days during normal plant production for concrete paving. For all other concrete, perform a verification strength test at least once every thirty (30) calendar days during normal plant production. (4) If the plant has not supplied concrete to the project for a period of greater than thirty (30) calendar days, perform a verification strength test. (5) Cast 3 cylinders plus one additional cylinder to embed the temperature sensor or 3 beams for each verification strength test. (6) The Engineer will test the concrete strength specimens for verification of the maturity curve as close to the maturity value determined to represent the opening, loading or form removal strength criteria in accordance with the Concrete Manual. (7) Record the results of verification test on the Concrete Maturity -Strength Verification form and submit an updated copy with the newest test result to the Engineer the day that the verification test is completed. (8) The Engineer may direct additional verification testing as necessary. (9) Submit electronic data from the maturity meters or temperature loggers in a comma - delimited (.txt or .csv) file format to the Engineer, which includes at least the project number, date and location of the meters or loggers. S-32.37 MnDOT 2461.3.G.6.d(4), 2461.3.G.6.d(5) and 2461.3.G.d(6) shall be deleted. S-32.38 following: MnDOT 2461.3.G.7.b, Table 2461-25 and Table 2461-26 shall be deleted and replaced with the G.7.b Non -Conforming Material Only place concrete meeting the slump requirements in the work. If the Contractor places concrete not meeting the slump requirements into the work, the Engineer will not accept non -conforming concrete at the contract unit price.