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

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SPECIAL PROVISIONS - SP20I6 BOOK Last Revision by CO Special Provisions: 2/08/17 (7) Created August 20, 2015 Page 35 SP 0202-101 Batching conditions and testing procedures similar to those expected for the proposed work. Submit all test results on the Strength Test Data sheet as part of the Contractor Mix Design Submittal. The Concrete Engineer reserves the right to request batching data representing the suitable experience record submittal. F.3.a(2) Conventional Trial Mixtures If the Contractor does not have a suitable experience record as required in 2461.2.F.3.a(1) above, establish concrete proportions from trial mixtures, utilizing an AMRL accredited laboratory in accordance with the following: (a) Use proportions and consistencies required for proposed work at the w/c ratios or cementitious materials content that will produce a strength meeting or exceeding the required 28-day compressive strength (f'c) in accordance with Table 2461-6 or 2461-7; (b) Design trial mixtures to produce slump within ± 0.75 in. of maximum permitted; (c) For air -entrained concrete, design trial mixtures to produce air content within ± 0.5 percent of maximum allowable air content; (d) For each w/c ratio or cementitious materials content, make and cure at least three test cylinders for 28-day breaks in accordance with ASTM C 192. For HE concrete mixes, in addition to the 28-day cylinders, make a set of three test cylinders for 48-hour breaks in accordance with ASTM C 192. Submit all test results for the trial mixtures, certified by the AMRL accredited laboratory, in addition to the Contractor Mix Design Submittal. S-32.13 Table 2461-11 of MnDOT 2461.2.F.4 shall be deleted and replaced with the following: Level 1 Mixes Level 2 Mixes Table 2461-11 Mix Design Adjustments Requirements Type of Change or Adjustment Mix Design Resubmittal Requirements • Cementitious Sources • Admixture Sources No resubmittal required • Admixture Dosage Rate • Aggregate Sources • Aggregate Proportions o Resubmittal of Mix Design • Any cementitious or SCM proportion (< 15% max fly ash) • Any cementitious or SCM proportion (> 15% max Resubmittal in accordance with fly ash) 2461.2.F.3.a • Admixture Dosage Rate No resubmittal required • Cement or SCM sources • Aggregate Source, no change in Aggregate Class • < 5% in any cementitious or SCM proportion* Resubmittal of Mix Design • < 10% in Aggregate Proportions • Aggregate source and Class of Coarse Aggregate • > 5% in any cementitious or SCM proportion Resubmittal in accordance with • > 10% Aggregate Proportions 2461.2.F.3.a • Admixture Sources