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 34 SP 0202-101 At least 21 calendar days before initial placement of the concrete, submit the appropriate General Concrete Mix Design Submittal form to the Concrete Engineer for approval. The Contractor Mix Design Forms are available from the MnDOT Concrete Engineering Website. Design the concrete mix to an absolute volume of 27.00 — 27.27 cu. ft. The Concrete Engineer will: (1) Provide specific gravity and absorption data using oven dry (OD) weights for mix design calculations. (2) Review the mix design submittal and approve the materials and mix design for compliance with the Specifications. Table 2461-8 defines the mix design submittal requirements for Level 1 and Level 2 Mixes. SCM Substitution Limits Level 1 Mixes * Level 2 Fly Ash: > 15% Mixes Ternary: Any Fly Ash: 0 — 15% Slag: 0-35% Table 2461-9 Mix Design Submittal Requirements Fine Gradation Preliminary Aggregate Test Data Submittal Package Limit Requirements Requirements 40-45%of total aggregate 3126 and 3137 None by volume None Use Either: • 3126 and 3137 • Job Mix Formula (JMF) 2461.2.F.3.a * High Early concrete in accordance with Table 2461-7 is defined as a Level 1 Mix. S-32.12 following: General Concrete Mix Design Use Either: • General Concrete Mix Design • General Concrete Mix Design (JMF) MnDOT 2461.2.F.3.a, 2461.2.F.3.a(1) and 2461.2.F.3.a(2) shall be deleted and replaced with the F.3.a Preliminary Test Data Requirements for Level 2 Mixes For Level 2 Mixes, submit the proposed Mix Design Proportions on the General Concrete Mix Design Submittal based upon either a suitable experience record or conventional trial mixtures not to exceed the limits specified in Table 2461-6 or 2461-7. F.3.a(1) Suitable Experience Record A suitable experience record consists of at least 30 consecutive tests, or two groups of consecutive tests totaling at least 30 tests, within the previous 18 months If the Contractor does not have 30 tests, the Concrete Engineer will consider a minimum of 10 test results representing a time period of at least 45 days. The Concrete Engineer considers a suitable experience record to have the following characteristics as compared to the proposed mix: (1) Average compressive strength (f cr) meeting the required 28-day compressive strength and no greater than 1000 psi above the required 28-day compressive strength, (2) Same type or grade of cementitious materials, (3) Same class of coarse aggregate, (4) Aggregate weights within 10% of the proposed, (5) Water/Cement ratio no greater than the maximum allowed, (6) Cementitious or SCM material weights within 5% of proposed, and