TABLE 401-3 ACCEPTANCE SCHEDULE BITUMEN CONTENT AND AGGREGATE GRADATION MAXIMUM ALLOWABLE DEVIATION OF THE MEAN OF 3,4 or 5 LOT *R (Range) The difference between the largest and smallest acceptance result. *R (Range) The difference between the largest and smallest acceptance test result. Section 402.-OPEN-GRADED ASPHALT CONCRETE FRICTION COURSE Description 402.01 This work shall consist of constructing a surface course on a foundation in accordance with these specifications and in reasonably close conformity with the lines, grades, thicknesses and typical cro sections shown on the plans or established by the Engineer. Materials 402.02 Composition of Mixture. The bituminous mixture shall composed of a mixture of aggregate and bituminous material. T amount of bituminous material shall be between 6 and 9 percent b weight of the total mixture, adjusted to reflect variations in aggregat densities. Prior to producing the bituminous mixture, the Contractor sha submit in writing the proportion of each type of aggregate that h proposes to use, as well as, a job-mix formula proposing definite singl values for: (a) The percentage of aggregate passing each specified sieve. (b) The percentage of bituminous material to be added based o total weight of mix. (c) The temperature of the mixture leaving the mixer. (d) The temperature of the mixture delivered on the road. The Engineer will evaluate the proposed job mix formula and make any adjustments in it as determined necessary to meet specified design criteria. The Engineer will establish the job mix formula with single values for (a) through (d) above, and will approve the job mix formula so notifying the Contractor in writing. The mixture furnished by the Contractor shall conform to this job-mix formula. The mixture shall have an index of retained strength (AASHTO T 165) of not less than 50 percent. When unsatisfactory results or a change in materials sources make it necessary, the Engineer may establish a new job-mix formula. Should a change in sources of materials be proposed, a new job-mix formula will be established before the new material is used. 402.03 Aggregates. Aggregates shall meet the applicable requirements of subsections 703.07 and 703.09. 402.04. Bituminous Materials. Bituminous material shall be AC 20 meeting the requirements of subsection 702.01. Construction Requirements 402.05 Weather Limitations. The weather limitations shall be as specified in subsection 401.11, supplemented to require that the surface temperature shall be at least 60° F (15 t° c). 402.06 Bituminous Mixing Plant. The plant shall meet the applicable portions of subsection 401.07. 402.07 Hauling, Placing and Compacting Equipment. Equipment shall meet the applicable requirements of subsection 401.08, 401.09, and 401.10, except than 401.10 is amended to require steel wheel rollers conforming to section 212.02(2). 402.08 Conditioning of Existing Surface. Immediately before placing the bituminous mixture, the existing surface shall be cleaned of loose or deleterious material by brooming or other approved means. Contact surfaces of curbing, gutters, manholes and other structures shall be painted with a thin, uniform coating of bituminous material prior to the bituminous mixture being placed against them. 402.09 Preparation of Materials. Materials shall be prepared in accordance with subsection 401.13 and 401.14 and mixed in accordance with subsection 401.15, with the following exception: (1) The aggregates shall be prepared in accordance with 401.14, except the temperature of the aggregates shall not exceed that at which the asphalt cement has a kinematic viscosity of 800 centistokes. 402.10 Transporting, Spreading and Finishing. The bituminous mixture shall be transported, spread and finished in accordance with subsection 401.17. 402.11 Compaction. After the bituminous mixture has been spread, struck off, and surface irregularities adjusted, it shall be thoroughly and uniformly compacted by rolling. The bituminous mixture shall be rolled in a longitudinal direction, commencing at the outside edge and progressing towards the center. Rolling shall be accomplished with a steel-wheel roller and shall be conducted in such a manner that shoving, distortion, or stripping will not develop beneath the roller. On superelevated curves, the rolling shall commence on the low side and progress to the high side. The amount of rolling shall be confined to only that necessary for consolidating the bituminous mixture and bonding it to the underlying surface. Excessive rolling shall be avoided. The completed bituminous mixture shall be protected from all traffic until it has set up and sufficiently hardened to resist abrasion. 402.12 Acceptance Sampling and Testing. Sampling and testing will be performed in accordance with subsection 401.21, 401.22, 401.23, and 401.24 as appropriate. Method of Measurement 402.13 The bituminous mixture shall be measured in accordance with subsection 401.25. Basis of Payment 402.14 The accepted quantities of the bituminous mixture determined as provided above will be paid for at the contract price, except that pay factors will be applied to the contract unit price in accordance with subsection 401.26, complete in place, which price and payment will be full compensation for all materials furnished and all work performed for work under this section. Payment will be made under: Pay Item 402(1) Open-Graded Asphalt Friction Course_-. 402(2) Open-Graded Asphalt Friction Course402(3) Asphalt Cement, Grade 402(4) Emulsified Asphalt Grade. Pay Unit Square Yard. Ton. Section 403.-HOT BITUMINOUS PAVEMENT Description 403.01 This work shall consist of constructing one or more courses of bituminous pavement on a prepared base in accordance with these specifications, and in reasonably close conformity with the lines, grades, thicknesses and typical cross sections shown on the plans or established by the Engineer. The bituminous pavement shall be composed of a mixture of aggregate and bituminous material of the type shown in the bid schedule. Materials 403.02 General. The materials and their use shall conform to the requirements of subsections 401.02 through 401.06. The percentage range by weight of bituminous material to be added will be shown in the special provisions. Aggregate shall meet the requirements of subsection 703.09 for the grading called for in the bid schedule. Construction Requirements 403.03 General. The construction requirements shall be as prescribed in subsections 401.07 thrrough 401.24. Method of Measurement 403.04 Hot bituminous pavement will be measured as prescribed in subsection 401.25. |