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 40 SP 0202-101 G.4.c Admixture Adjustments Approved admixture additions are allowed within 90 min from the initial batch time stated on the Certificate of Compliance. If the load of concrete has no available water to add, or the load is greater than 60 minutes old, the Engineer will allow one admixture adjustment diluted with up to 2 gallons of water. G.4.d Consistency and Air Content Adjustments The Engineer will test the concrete for compliance with 2461.3.G.7, "Consistency," and 2461.3.G.8, "Air Content," in accordance with the following: (1) If the first test taken by the Engineer passes, the Engineer will continue verification testing in accordance with the Schedule of Materials Control. (2) If the test taken by the Engineer fails, make adjustments and perform any quality control testing before the Engineer performs a final test. Acceptance or rejection of the truck is based on the Engineer's final test result. (3) The Engineer will test up to two additional trucks in accordance with items (1) and (2) above, and (4) If the concrete does not meet the specification after those three trucks, the Engineer will reduce their verification testing rate to once per truck for acceptance for the remainder of the pour. For concrete mixes 3U17A and 3U18, allow mix to hydrate 5 min before slump test to assure all cement is saturated. S-32.31 MnDOT 2461.3.G.5, 2461.3.G.5.a, 2461.3.G.5.b and 2461.3.G.5.c shall be deleted and replaced with the following: G.5 Test Methods and Specimens Perform random sampling and testing in accordance with the Concrete Manual and determine testing rates meeting the requirements of the Schedule of Materials Control. The Engineer performs random sampling and testing in accordance with the Concrete Manual, determines testing rates meeting the requirements of the Schedule of Materials Control. Anyone fabricating concrete cylinders or beams is required to hold either a current ACI Field 1 Technician Certification or a MnDOT Field 1 Technician Certification. Anyone performing concrete strength testing of cylinders is required to hold one of the following current certifications: (1.1) ACI Strength Testing Technician Certification, (1.2) MnDOT Strength Testing Technician Certification, or (1.3) WisDOT Strength Testing Technician Certification. The Engineer will furnish molds based on the maximum size aggregate for the test specimens in accordance with the following: (2.1) 4 in x 8 in cylinder molds, (2.2) 6 in x 12 in cylinder molds for maximum aggregate sizes greater than 11/4 in, and (2.3) 6 in x 6 in x 20 in beam molds; use other beam mold sizes as approved by the Engineer. The Engineer will transport the cylinders in accordance with the following: (3.1) A minimum of at least 16 hours after casting. (3.2) A minimum of at least 12 hours after casting for high early strength (28-day) cylinders.