Section 403 — Asphalt Concrete
Description
403.01This work consists of constructing asphalt concrete facilities using HMA or WMA.
Construction Requirements
403.02Composition of Mix (Job-M ix Formula). Conform to current state department of transportation material specifications for asphalt concrete. Submit a state department of transportation JMF approved within the past 12 months for approval at least 30 days befor e production that meets the current state department of transportation requirements for the location and type of facility being constructed. For each proposed JMF, submit a production certification conforming to state department of transportation specifications. Submit the strength, quality, and gradation specifications for the asphalt concrete mix. Include copies of laboratory test reports that demonstrate aggregate, asphalt binder, additive, and mix properties meet state department of transportation specifications. Submit the maximum specific gravity (density) of the mix as determined by AASHTO T 209. If requested, submit a representative 100-pound loose mix sample 21 days before placement.
403.03Production Start-U p Procedures. Conform to Subsection 153.03( b).
403.04Equipment. Conform to Subsection 401.05.
403.05Surface Preparation. Conform to Subsection 401.06.
403.06Weather Limitations. Confor m to Subsection 401.07.
403.07Hauling. Conform to Subsection 401.11.
403.08Placing and Finishing. Do not use mixes produced from different plants unless the mixes are produced according to the same JMF, use material from the same sources, and are approved. Place HMA at temperatures shown in Table 401-4. Place WMA at temperatures according to Subsection 401.03(d)( 5). Measure temperature of the asphalt concrete mix in the hauling vehicle immediately before dumping into the spreader or measure it in the windrow immediately before pickup.
Place the mix with a paver conforming
to Subsection 401.05. Control horizontal alignment using a reference line. Automatically control the grade and slope from reference lines, a ski and slope control device, or dual skis. Use skis having a minimum length of 20 f eet. In areas where mechanical sp reading and finishing are impractical, place and finish the asphalt concrete mix by other approved methods to produce a uniform finished surface. Offset the longitudinal joint according to Subsection 401.13. 350 403.09 Compacting. Thoroughly and uniformly compact the asphalt surface by rolling. In places inaccessible to rollers, use approved alternate equipment. Do not cause cracking, shoving, or undue displacement. Monitor the compaction process with nuclear density gauges calibrated according to ASTM D2950 within 6 months before use. Check the standard and reference on each day of use according to the ASTM D2950 standardization and reference check sections. Compact to at least 91.0 percent of the maximum specific gravity (density) determined in Subsection 403.02 . Do not pass rollers over an unsupported edge of freshly laid asphalt concrete mix. Continue rolling until roller marks are eliminated, cracks are sealed, and the required density is obtained. For HMA, d o not roll the mix after the surface cools below 175 °F.
403.10Joints, Trimming Edges, and Cleanup. Conform to Subsection 401.15.
403.11Pavement Straightedge Measurement. Measure the pavement surface using a 10- foot metal straightedge at right angles and parallel to the centerline. Defective areas are deviations between the surface and the bottom of the straightedge more than ¼ inch measured between two contacts of the straightedge or deviations more than ¼ inch measured at the end of the straightedge. Correct defective areas according to Subsection 401.17. Obtain approval for the method of correction.
403.12Acceptance. See Table 403-1 for sampling, testing, and acceptance requirements. If no asphalt concrete type is designated, evaluate according to Type I in Table 403-1. Asphalt binder will be evaluated under Subsection 106.03. Asphalt concrete mix properties will be evaluated under Subsections 106.03 and 106.04. Construction of asphalt concrete facilities will be evaluated under Subsections 106.02 and 106.04. Pavement straightedge measurement will be evaluated under Subsection 106.04.
Measurement
403.13Measure the Section 403 pay items listed in the bid schedule according to Subsection 109.02 .
Payment
403.14The accepted quantities will be paid at the contract price per unit of measurement for the Section 403 pay items listed in the bid schedule. Payment will be full compensation for the work prescribed in this Section. See Subsection 109.05 . Table 403-1 Sampling, Testing, and Acceptance Requirements
Material or
Product
(Subsection) Type of
Acceptance
(Subsection) Characteristic Test Methods
Specifications Sampling
Frequency Point of
Sampling Split
Sample Reporting
Time Remarks
Mix Design
Asphalt
concrete,
Type I Measured &
tested for conformance (106.04 ) Job-mix formula Subsection
403.02If requested Flowing mix stream (bin or belt discharge) or behind the paver before compaction Yes Before approval of job-mix formula Tested by the
Government
Production
Asphalt
concrete,
Type I Measured &
tested for conformance (106.04 ) Job-mix formula Subsection
403.021 per 700 tons Behind the paver before compaction Yes 24 hours − Density(1) AASHTO T 166 " In-place after compacting " " Deliver cores to CO after testing is completed
Maximum
specific gravity(2),(3) AASHTO T 209 " Behind the paver before compaction " " −
Surface
tolerance Straightedge measurement,
Subsection
403.11Continuously, after compaction Finished pavement surface No " −
Placement
temperature − First load & as directed thereafter Hauling vehicle before dumping, or windrow before pickup " Upon completion of measurement −
Process
control (153.03 ) Gradation at the plant AASHTO T 27 & T 11 Contractor determined Cold feed or hot bins as applicable No 24 hours −
Moisture
content of aggregates AASHTO T 255 " Stockpile " " − Density ASTM D2950 1 per 500 ft In-place after compacting " " − Table 403- 1 (continued) Sampling, Testing, and Acceptance Requirements
Material or
Product
(Subsection) Type of
Acceptance
(Subsection) Characteristic Test Methods
Specifications Sampling
Frequency Point of
Sampling Split
Sample Reporting
Time Remarks
Asphalt
concrete,
Type II Measured &
tested for conformance (106.04 ) Density ASTM D2950 1 per 500 ft In-place after compacting No 24 hours −
Surface
tolerance Straightedge measurement,
Subsection
403.11Continuously, after compaction Finished pavement surface " " −
Placement
temperature − First load & as directed thereafter Hauling vehicle before dumping, or windrow before pickup " Upon completion of measurement − (1)For asphalt concrete Type I, c ut two 6 -inch diameter side by side cores. Obtain cores as soon as the pavement has cooled sufficiently to allow coring, but not later than 12 hours after final rolling. Remove them with a core retriever and fill and compact the core holes with asphalt concrete mixtur e. Label the cores and protect them from damage due to handling and temperature. Submit one core for verification testing. Dry the other core to constant mass at 125±5 °F or vacuum dry it according to ASTM D7227 before performing the core density and measuring the thickness. Use 62.245 pounds per cubic foot to convert specific gravity to density. (2)After production paving has begun, use the average maximum specific gravity value (AASHTO T 209) for each day to adjust t he percent compaction for the cores that represent that day’s paving.(3)Do not use the supplemental procedure for mixtures containing porous aggregate (dry back method of AASHTO T 209).