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. 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 Contractor shall supply the mix design data for the RAP mixes (including asphalt content of the RAP) to the Project Engineer.
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.
MIX DESIGN. The Contractor shall carry out trial mixes to determine the job mix formulae (gradation of aggregates, precise proportions of bitumen and aggregates) at least 30 days before production of bituminous mixes are started and as soon as possible after commencement of aggregate production. The study shall permit to check that, in spite of the normal fluctuations of a welladjusted plant, the performances of the materials satisfy the requirement of these Technical Specifications. The Contractor shall submit for the approval of the Engineer full details of his proposed aggregates grading and bitumen content together with details of the mix design and results of test carried out at ranges of bitumen contents from below the proposed bituminous content to above. Specimens at each bitumen content shall be made in quadruplicate. The approved laboratory design mix shall be confirmed by full-scale plant trials using the full range of bitumen contents. The approved plant trial mix shall be termed the Job Standard Mix.
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. The Contractor shall submit to the Engineer for approval a complete mix design prepared and certified by a laboratory. Compatibility of the aggregate, polymer-modified emulsion, mineral filler, and other additives shall be verified by the mix design. The mix design shall be made with the same aggregate gradation that the Contractor will provide on the project. Recommended tests and values are as follows: ISSA TEST NO. DESCRIPTION SPECIFICATION ISSA TB-139 Wet Cohesion @ 30 Minutes Minimum (Set) @ 60 Minutes Minimum (Traffic) 12 kg-cm Minimum 20 kg-cm Minimum or Near Spin ISSA TB-109 Excess Asphalt by LWT Sand Adhesion 50 g/ft2 Maximum (538 g/m2 Maximum) ISSA TB-114 West Stripping Pass (90% Minimum) ISSA TB-100 Wet-Track Abrasion Loss One-hour Soak Six-day Soak 50 g/ft2 (538 g/m2) Maximum 75 g/ft2 (807 g/m2) Maximum The Wet Track abrasion test is performed under laboratory conditions as a component of the mix design process. The purpose of this test is to determine the minimum asphalt content of a slurry system. The Wet Track Abrasion Test is not recommended as a field quality control or acceptance test. Some systems require longer times for the asphalt to adhere to the stone. In these systems, a modified Xxxxxxxx Stability Test (ISSA TB-148) or Xxxxx Cohesiometer Test (ASTM D 1560) has been used to confirm asphalt content.
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 and 555.02.01-2. Establish the percentage of dry weight of aggregate passing each required sieve size and an optimum percentage of asphalt binder based upon the weight of the total mix. Determine the optimum percentage of asphalt binder according to AASHTO R 35 and M 323 with an Ndes of 50 gyrations. Before maximum specific gravity testing or compaction of specimens, condition the mix for 2 hours according to the requirements for conditioning for volumetric mix design in AASHTO R 30, Section 7.1. If the absorption of the combined aggregate is more than 1.5 percent according to AASHTO T 84 and T 85, short term condition the mix for 4 hours according to AASHTO R 30,
