MIX DESIGN. 45.1 The following instructions shall be followed as regards preliminary design of mix and methods of batching of plain cement concrete and reinforced cement concrete. These instructions should be treated as supplementary to the relevant provision in the specifications for the respective items contained in the book of standard specifications and will override the provisions contained therein wherever they are contrary to the following instructions. The preliminary mix design and batching for various grades of concrete shall be governed by the following guidelines. Concrete Grade Guidelines
MIX DESIGN. The Contractor shall supply the mix design data for the RAP mixes (including asphalt content of the RAP) to the Project Engineer.
MIX DESIGN. Immediately upon the receipt of the award of the contract, the Contractor shall inform the Engineer-in- charge the exact location of the sources of materials which he proposes to use and get the materials approved. The mix with the actual approved materials to be used shall be got designed by the Contractor in an approved laboratory chosen by BHEL and got approved by the Engineer-in-charge. These proportions shall be used so long as the materials continue to be the same quality and from the same sources. If during the progress of work, the Contractor wishes to change the materials, the proportions shall be fixed on the basis of fresh preliminary tests to give the required strength. No change of materials shall be allowed unless fresh tests with new materials show satisfactory results.
MIX DESIGN. THE FIRST PARAGRAPH IS CHANGED TO: Design the SMA to meet the requirements in Table 902.05.02-1 and Table 902.05.02-2. Prepare the JMF according to AASHTO R 46. Determine the JMF at 4 percent air voids and 75 gyrations of the Superpave gyratory compactor. TABLE 902.05.02-2 IS CHANGED TO: Table 902.05.02-2 SMA Mixtures Volumetrics For Design and Plant Production Production Property Control Tolerances Requirement Air Voids ±1% 4.0% Voids in Mineral Aggregate (VMA) – 17.0% minimum VCAmix – Less than VCAdry Draindown @ production temperature – 0.30% maximum Asphalt Binder Content (NJDOT B-5) ±0.15% 6% minimum Asphalt Binder Content (AASHTO T 308) ±0.40% 6% minimum Tensile Strength Ratio (AASHTO T 283) – 80% minimum
MIX DESIGN. THE FOURTH PARAGRAGH IS CHANGED TO: The ME will test 2 specimens to verify that the final JMF produces a mixture that has a minimum void content as specified in Table 902.03.03-1. The ME will determine percent air voids according to AASHTO T 209, and either NJDOT B-6 or AASHTO T 331.
MIX DESIGN. A. All concrete shall consist of proper proportions of Portland Cement, coarse aggregates, fine aggregates, and clean water conforming to application of A.S.T.M. Standard Specifications.
MIX DESIGN. THE ENTIRE TEXT IS CHANGED TO: Design the SMA to meet the requirements in Table 902.05.02-1 and Table 902.05.02-2. Prepare the JMF according to AASHTO R 46. Determine the JMF at 4 percent air voids and 75 gyrations of the Superpave gyratory compactor. Table 902.05.02-1 SMA Specification Band (% passing) nominal-maximum aggregate size Production Control Tolerances1 Sieve Size 19 mm % Passing 12.5 mm % Passing 9.5 mm % Passing 0% 1" 100 100 100 ±5% 3/4" 00-000 000 000 ±5% 1/2" 00-00 00-000 100 ±5% 3/8" 00-00 00-00 70-95 ±4% No. 0 00-00 00-00 30-50 ±4% No. 0 00-00 00-00 20-30 ±4% No. 16 – – 0-21 ±3% No. 30 – – 0-18 ±3% No. 50 – – 0-15 ±2% No. 200 8.0-11.0 8.0-11.0 8.0-12.0 Coarse Aggregate Portion Retained Portion retained Portion retained Fraction on No. 4 Sieve on No. 4 Sieve on No. 8 Sieve Minimum Lift Thickness 1. Production tolerances may fall outside of the wide band gradation limits. Property Table 902.05.02-2 SMA Mixtures Volumetrics For Design and Plant Production Production Control Tolerances Requirement Air Voids ±1% 4.0% Voids in Mineral Aggregate (VMA) – 17.0% minimum VCAmix – Less than VCAdry Draindown @ production temperature – 0.30% maximum Asphalt Binder Content (AASHTO T 308) ±0.40% 6% minimum Tensile Strength Ratio (AASHTO T 283) – 80% minimum
MIX DESIGN. Mix design is normally a prerequisite to any concreting job and will be required on all major works. If so required, an approved testing laboratory shall, at the Contractor’s expense, design a mix for each class of concrete and shall submit full details of the mix designs to the Engineer for his approval. The Engineer’s representative and the contractor shall clearly code each approved mix with a number and date, and file all details for identifying and reproducing exactly the same mix. General : Each mix design shall be such that the aggregate shall comprise fine aggregate and coarse aggregate of the size specified and the combined aggregate grading shall be continuous. Aggregate shall be calculated by weight, and batching procedures shall be established. The cement content by weight shall not be outside the minimum and maximum limits calculated from the minimum and maximum dry aggregate to cement ratios specified. The mixes shall be designed to produce average concrete cube strength at twenty eighth day after manufacture not less than the trail mix test strength specified. The water/cement ratio shall be in the region of 0.45 to 0.55 and shall never exceed 0.60.
MIX DESIGN. If treatment of the recycled layer with emulsified asphalt is required by the contract, the Department will supply a mix design for the emulsified asphalt stabilized material based on test results from pavement and soil analysis taken to the design depth. The Department will provide the following information prior to construction:
MIX DESIGN. At least 45 days before initial production, submit a JMF for the BDWSC on forms supplied by the Department. Include a statement naming the source of each component and a report confirming the results meet the criteria specified in Tables 555.02.01-1
