602 - HOT MIX ASPHALT (HMA) CONSTRUCTION (Quality Control/Quality Assurance (QC/QA)) 600-14 compaction foreman shall document at a minimum of once every 2 hours th at the approved rolling sequence is being followed. Documentation incl udes roller passes, the mat temperature at each pass, amplitude setting of rollers and roller speed. Provide the documentation to the Engineer. Determine and periodically update an approved rolling procedure and pe riodically, as outlined in this section. As a minimum, evaluate the initial rolling procedure using 3 rollers. If the hot mix plant is operating at over 275 tons per hour, use a minimum of 4 rollers in the initial evaluation. Operate vibratory rollers according to SECTION 151 . Evaluate HMA paver screed operation with the nuclear gauge at various vibration settings. For screed evaluation, take the nuclear gauge readings directly behind the screed and before rolling. The Compaction Foreman and Engineer will evaluate the densities obtained with the various roller combinations and screed settings to determine the initial approved rolling procedure. Together, the Compaction Foreman and Engineer will determine when new rolling procedures are required. HMA production may be stopped by the Compaction Foreman or Engineer whenever rolling is not being performed according to the approved rolling procedure.
When using WMA, achieve the maximum density before the temperature of the WMA falls below 165 oF. Do not crush the aggregate. Wh en the mat temperature falls below 175 F or 165F for WMA, roller marks may be removed from the mat with a self-propelled static steel roller.
TABLE 602-10: DAILY PRODUCTION VS NUMBER OF SUBLOTS AND TEST REQUIREMENTS Daily Production
Nuclear Density Tests** No. of Verification Cores or Nuclear Density Tests** * 6* 3* 600-999 4* 8* 4* 1000 or more 5 10 5 *Minimum number for mixes with a specified thickness of 1½ inches or greater: The Contractor may choose to obtain the number required for 1000 or more tons. If the Contractor chooses to test 5 sublots (10 tests) , KDOT will obtain 5 verification tests. **For mixes with a specified thickness less than 1½ inch: Verification testing may be perfo rmed, but is not required. Additional testing may be performed by the Cont ractor. A minimum of 10 tests are required.
uniform coating of asphalt material. Pl ace the HMA uniformly high n ear the contact surfaces so that after compaction it shall be approximately ¼ inch above the edge of such structures.
provide a thorough and c ontinuous bond, provide an acceptable surface texture and meet density requirements. Do not vary the surface elevation more than 3/16 inch in 10 feet, when tested longitudinally across the joint. When required, repair the joints or paving operations will be suspended.
compaction at the joint. If deemed necessary by the Engineer to properly seal the joint, apply a light coat of asphalt emulsion or asphalt binder to the exposed edge before the joint is made. Before placing the fresh HMA against a cut joint or against old pavement, spray or paint the contact surface with a thin uniform coat of asphalt emulsion or asphalt binder. Where a finishing machine is used, make the longitudinal joint by depositing a sufficient amount of HMA to form a smooth and tight joint. Offset the longitudinal joint in successive courses by 6 to 12 inches. Comply with traffic lane edges for the width of the surf ace of top course placement.