MIX DESIGN Sample Clauses
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. Sr No Concrete Grade Guidelines
1) Upto M-15: This should only be ordinary concrete. No change may be prescribed in the present practice as regards preliminary design of mix and permitting volume batching. Only cement to weight batched
2) M-20 and above Preliminary mix design must be prepared for such mixes Weight batching shall be insisted for cement fine aggregate and course aggregate.
45.2 For the grades of concrete M-20 and above the preliminary mix design shall be carried out from the approved laboratory.
(1) The charges for preliminary design, of concrete mix shall be entirely borne by the contractor.
(2) For grades of concrete M-20 and above where cement is to be used by weight, the cost of extra cement required to make-up the under-weight bags shall be borne by the contractor.
(3) For the items of concrete of grades lower than M-20 and other items in the agreement, where cement is not to be used by weighment, the cement bags as received from the manufacturer and supplied to the contractor under Schedule ‘A’ shall contain cement of 50 Kg. net weight.
45.3 The admixtures such as plasticizers/super plasticizers for concrete grade M-20 and above shall be used as directed by Engineer in charge depending upon specific requirements. No extra payment s on this account will be admissible ADDITIONAL TENDER CONDITIONS
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
1) Upto M-15: This should only be ordinary concrete. No change may be prescribed in the present practice as regards preliminary design of mix and permitting volume batching. Only cement to weight batched 2) M-20 to M-25 : Preliminary mix design must be carried out for these mixes. However, weight batching shall be insisted for cement .only for concrete m-20 and above
MIX DESIGN. 44.1) The following instructions shall be followed as regards preliminary design of mix 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. 44.1) The following instructions shall be followed as regards preliminary design of mix 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 respectIV Ae 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
1 Up to M-15 This should only by ordinary concrete. No change may be prescribed for the present practice as regards preliminary design of mix permitting volume batching.
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: 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 contractor shall designate mix proportions and prepare the job mix formula. The final mix design shall conform to the requirements listed in Table 611-3. All component materials used in the mix design shall be representative of the materials proposed by the Contractor for use in the work. ISSA TB-139 Wet Cohesion: At 30 minutes min. (set) At 60 minutes min. (traffic) 12 kg-cm min. 20 kg-cm min. ISSA TB-109 Excess Asphalt by LWT Sand Adhesion 538 g/ max. ISSA TB-114 Wet Stripping Pass (90% min.) ISSA TB-100 Wet Track Abrasion Loss: - One-Hour Soak - Six-Day Soak 538 g/ 807 g/ ISSA TB-147A Lateral Displacement 5% max. Specific Gravity after 1000 cycles of 57 kg 2.1 max. ISSA TB-144 Classification Compatibility (AAA, BAA) 11 grade points min. ISSA TB-113 Mix Time at 25°C Controllable to 120 s min. The Contractor shall submit, at least 7 Days prior to placing any material in the work, the aggregate gradation, final mix design, and results of the Micro-Deval test and the tests listed in Table 611-3. The Contractor shall submit, at the beginning of each Day of Work, a written summary of the total quantity and distribution rate of microsurfacing placed the previous Day, including a list of the quantities used for each component: aggregate, emulsion, mineral filler and additive(s).
MIX DESIGN. At least three weeks prior to beginning work, submit a mix design with certified test results from the most recent mix design verification testing to the State Materials Engineer. Furnish the following information for each mix: • Specific project for which the mixture will be used • Type(s) of SFST to be used on project • Source and description of the materials to be used • Proportions of the raw materials to be combined in the SFST mixture • Single temperature at which to discharge the SFST onto the asphaltic concrete paved shoulder surfaces • Name of the person responsible for quality control of the mixture during production and placement • Proposed spreadrate for SFST placement • Test Results for SFST Mix Design Properties
1. Do not start SFST work until the Engineer has approved the mix design for the SFST to be used. No material will be accepted until the Engineer has given approval.
2. After a SFST mix design has been approved, assume responsibility for the quality control of the mixtures supplied to the Department according to Subsection 106.01, “Source of Supply and Quantity of Materials.” Test Method Description Criteria Specification ASTM D 3910 Wet Track Abrasion Loss 6 Day Soak Maximum 1.5 lb/yd2 (807 g/m2 ) 1 Hour Soak Maximum 1 lb/yd2 ( 538 g/m2 ) ASTM D 2196 Initial Brookfield Viscosity at 77°F (RV-4, 20 rpm) 5,500 – 9,000 cPs AASHTO T111 Total Inorganic Aggregate Content > 34.0 % ASTM D 2486 Modified4 Wear Resistance < 4.0 %
1. Report Asphalt Content of Mixture prior to being loaded for install as % Solids minus % Ash. 2. Ash Content as a percentage of Solids Content. 3. Ash Content of completed HDMB minus Ash Content of HDMB Base Non-Ionic Emulsion. Total Inorganic Aggregate Content defined as slate, refined corundum, and sand. 4. ASTM D 2486 (Modified): Prepare samples at 48 Wet Mils on glass panel. Dry at 77 ºF for 3 days. Immerse in water for 24 hours at 77 ºF. Test scrub resistance with 1,000 gram brass brush for 12,000 cycles. Report % of dry film lost. 5. Total allowed sand content in Mix Design. 4% No. 50 (300 m) 20-45 3% No. 200 (75 m) 5-15 Design Requirements Range AASHTO T 245 (Modified) Flow 6-16 AASHTO T 245 (Modified) Min. Stability, lb (kg), 50 Blow ▇▇▇▇▇▇▇▇ 1800 (8000) ISSA TB-147A or 147C Vertical Displacement (Maximum) 10% ISSA TB-109 Excess Asphalt by LWT (Maximum) 1 lb/yd² (538 g/m²) ISSA TB-113 Mixing Time Test @ 100 F (38 C) (Minimum) 45 Seconds ISSA TB-102 Water Resistance Test @ 30 Minutes No Discoloration ISSA...
MIX DESIGN. The contractor shall submit for approval, a job mix formula for the material that shall include the source of each component. The job mix formula for the mixture shall establish the percentage of dry weight of aggregate passing each required sieve size and the optimum percentage of asphalt binder based upon the weight of the total mix. The design values of percent passing each sieve size shall be within the gradation band of Subsection 303.05. The permeability shall be 1500 At least 45 days prior to the production of the asphalt-stabilized open-graded material, the Contractor shall submit a mix design for approval. In addition, samples of the component materials shall be submitted for verification by the Central Laboratory. The quantities submitted shall be: Blended Aggregate 198 pound Asphalt Binder 1 gallon Anti-Stripping Agent, if needed 0.264 gallon The submitted sample will be tested for gradation according to AASHTO T-27. The components will be mixed according to the JMF at a temperature of 260 degrees F. The mixture will be compacted according to ASTM D1074 and the NJDOT Laboratory procedure “Compaction of Bituminous- Stabilized Open-Graded (BSOG) Base Course Material”. The samples will be compacted at 260 degrees F using a Universal Testing machine. The stress applied will be 600 psi for carbonate rock and 1000 psi for all other aggregate types. Permeability will be determined according to NJDOT Laboratory Procedure “Falling Head Permeability Test for Non-Stabilized and Bituminous Stabilized Open Graded Base Course Materials”. At the Department's option, verification of the mix design may be done on an annual basis provided the properties and proportions of the materials do not change appreciably. The approved proportions of material will govern during the progress of work, except that the Contractor may change to another previously approved mix design, provided that the Engineer is notified at least three days prior to the change. No change in source or character of any material shall be made until approved by the Engineer, based on the results of tests of the new design mixes or previously approved mix designs using the new material.