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 39 SP 0202-101 (4) Check the bins and stockpiles for segregation, contamination, and interblending of the aggregates; (5) Obtain Aggregate Quality samples per Schedule of Materials Control; (6) Observe Producer's Certified Technician obtain aggregate samples and run gradation and moisture tests when possible; (7) Verify cement, fly ash, and admixtures are certified and approved; (8) Obtain cement, fly ash, and admixtures samples per the Schedule of Material Control; (9) Provide the following test results to the Producer in a timely manner: (9.1) Cementitious Materials (9.2) Admixtures (9.3) Verification Gradations (9.4) Coarse Aggregate Quality S-32.28 The first paragraph of MnDOT 2461.3.G.1 shall be deleted and replaced with the following: Notify the Engineer at least 24 h before beginning concrete production to allow the Engineer time to provide inspection forces needed for the work and to approve preparations for concrete placement. If the Contractor fails to provide 24 h notice, the Engineer may delay concrete placement and will consider any concrete incorporated into the work as unauthorized in accordance with 1512.2, "Unauthorized Work." The Engineer will consider any delays to the Contract resulting from unauthorized work as non -excusable in accordance with 1806.2.C, "Non -Excusable Delays." S-32.29 MnDOT 2461.3.G.2 shall be deleted and replaced with the following: G.2 Placement Temperatures Maintain concrete temperature from 50 °F to 90 °F until placement. Unless Engineer approved cold weather protection plans are in —place, do not place concrete when the air temperature is either of the following at the point of placement: (1) Below 36 °F, or (2) The National Weather Service predicts the temperature to fall below 36 °F within the following 24 h period. S-32.30 MnDOT 2461.3.G.4 shall be deleted and replaced with the following: G.4 Field Adjustments Mix the load a minimum of 5 min or 50 revolutions at mixing speed after addition of admixture or water. G.4.a Water Adjustments The Engineer will allow water adjustments in accordance with all the following: (1) Prior to discharging approximately 1 cubic yard of concrete, (2) Water available to add stated on the Certificate of Compliance, and (3) Concrete is within 60 min from the initial batch time stated on the Certificate of Compliance. G.4.b Water Adjustments for Concrete Placed by the Slip -Form Method The Engineer will allow water adjustments for all grades of concrete placed by the slip -form method, except Grade A paving concrete, in accordance with all of the following: (1) If water is available to add as stated on the Certificate of Compliance. (2) Concrete is within 60 min from the initial batch time stated on the Certificate of Compliance.