613 – ULTRATHIN BONDED ASPHALT SURFACE
600-76 Station one flagger ahead of the application of the tack coat and one flagger ahead of the area being protected
from traffic. Take adequate protection for tr affic on side roads approaching the tack area.
g.Treatment of Adjacent Areas. Pave sideroads, entrances and turnouts for mailboxes as shown in the Contract Documents. Overlay all widening areas designated in the Contract Documents or ordered by the Engineer.
h.Pavement Smoothness. Evaluate pavement smoothness according to SECTION 603 . 613.5 PROCESS CONTROL
a.General. Establish gradation limits and proportions for each individual aggregate and mineral filler. Specify the limits and proportions such that the material produced complies with the applicable requirements of the designated mix type. The Contractor is responsible for all process control operations including testing. At no time will KDOT’s representative issue instructions to the Contractor or producer as to setting of dials, gauges, scales and meters. KDOT will collect and test verification samples an d assurance samples and inspect the Contractor’s quality control operations.
b.JMF Adjustments. Produce a mixture of uniform composition closely complying with approved design JMF to obtain the specified properties when compacted. If, during production, results from quality control tests demonstrate a need to make adjustments to the mix design, then make adjustments to the design JMF single point gradation and binder content to achiev e the specified properties. The JMF adjustments shall produce a mix that complies with TABLE 613-1 for the specified mix designation. When necessary, adjust on a sublot basis. Report the new JMF to KDOT’s field representative and the DME before making such changes, and submit a new mix design for review and approval if required by the DME.
c.Specification Working Ranges. Establish acceptable limits for fiel d test results by applying the tolerances shown in TABLE 613-5 to the JMF or adjusted JM F for binder content. Es tablish acceptable limits for the other listed mix characteristics by applying the tolerances shown in TABLE 613-5 to the requirements of TABLE 613-1 . TABLE 613-5: SPECIFICATIO N WORKING RANGES (QC/QA) Mix Characteristic Tolerance from JMF and Specification Limits Single Test Value Plot 3 Point Moving Average Value Binder Content (Maximum deviation from JMF) ±0.3% * ±0.3% Film Thickness n/a * zero tolerance Gradation** n/a * zero tolerance Course Aggregate Angularity (CAA) zero tolerance n/a Fine Aggregate Uncompacted Vo ids (FAA) zero tolerance n/a Sand Equivalent zero tolerance n/a *Values to plot. In addition, plot the Gmm values. For gradations, as a minimum, plot the No. 4, 8, 30 and 200 sieves. **The maximum deviation for UBAS from the JMF for the sieves with a ± tolerance shall be as listed in TABLE
613-6 Only the No. 16, 30, 50 and 100 si eves may exceed th e limits listed in TABLE 613-1 provided the
minimum retained percentage shown in TABLE 613-6 is met. TABLE 613-6: SPECIFICATION WORKING RANGES FROM THE JMF Mix Designation Percent Retained – Square Mesh Sieves ¾" ½" ⅜" No. 4 No. 8 No. 16 No. 30 No. 50 No. 100 No. 200 Type A ±5 68 - 78 75 min 82 min. 87 min. 90 min. 94.0 – 96.0 Type B ±5 ±4 73 - 83 77 min. 82 min 87 min. 90 min. 94.0 – 96.0 Type C ±5 ±5 ±4 73 - 83 77 min. 82 min 87 min. 90 min. 94.0 – 96.0 613 – ULTRATHIN BONDED ASPHALT SURFACE
600-77 d. EBL Shot Rate Specification. Periodically determine the application rate of the EBL. The Engineer
will verify the application rate. Acceptable tolerance of the application rate is the target rate ±0.02 gal/sq yd. Check for proper coverage at least twice per day by applying the EBL to the road surface for a minimum distance of 20 feet. When the Engineer verifies the coverage meets specification, back up the paver and shoot not more than 1/4 of the EBL shot rate over the previously tacked segment. 613.6 WEATHER LIMITATIONS Do not place UBAS on any wet or frozen surface or when weather conditions otherwise prevent the proper handling and finishing of the mixture. Only place UBAS when either the mi nimum ambient air temperature is 50 oF or the minimum road surface temperature is 55oF. 613.7 MIXTURE ACCEPTANCE
a.General. Test the UBAS at each pl ant for compliance with TABLE 613-1 . Acceptance will be made on a lot by lot basis contingent upon satisfactory test results. Obtain quality control and verification samples of the UBAS using KT-25 sampling procedure C.1 Plant Discharge or C.2 Truck Bed. A load or loads of mixture which, in the opinion of the Engineer, are una cceptable for reasons such as being segregated, aggregate being improperly coated, foaming aggr egate or being outside the mixing temperature range may be rejected.
b.Lot Definition for Mix Production Sampling and Testing. A lot is defined as an isolated quantity of a specified material produced from a single source or operation. Each lot shall normally be represented by 4 contiguous test results. A lot may be represented by test results on samples taken from 1 or more day’s production.
c.Lot Investigation. The Engineer may examine materials represented by individual test results which lie beyond the Contractor’s normal quality control testing variation. The investigation may be based on either Contractor or KDOT test results. Th e information from additiona l testing (including testing of in-place HMA) may be used to define unacceptable work according to SECTION 105 . The Engineer may apply appropriate price reductions or initiate corrective action. For any test, if a dispute exists between the Engineer and Contractor about the validity of the other’s test results, the KDOT District Materials Labor atory or the MRC will perform referee testing. If the disputed KDOT test results were generated at the District Laboratory, the MRC will perform the refe ree tests. If the disputed KDOT test result was generated at the MRC, an inde pendent laboratory agreeable to both par ties will be selected. The Laboratory shall be accredited by the AASHTO Accreditation Pr ogram in the appropriate testing category. If referee testing indicates that KDOT test results are co rrect, the Contractor pays for the additional testing, including referee testing performed at the MRC. This will be paid using the bid item Contract Deduct which will be an item added to the contract. If the referee testing indicates that C ontractor test results are correct, KDOT pays for the additional testing. Pay the independent lab for the testing and submit the pa id invoice to KDOT. The Engineer will reimburse the Contractor (based on the invoice price) as Extra Work, SECTION 104 .
d.Multiple Projects. If multiple projects are supplied from 1 or more plants using the same mix, carry over the lots at each hot mix pl ant from project to project.
e.Lot Size. A standard size mix production lot consists of 4 equal sublots of 400 tons each of asphalt mixture (lot size 1,600 tons). If the last sublot contains less than 200 tons, combine it with the previous sublot. It is anticipated that lot size shall be as specified. However, with the Engineer’s approval, the Contractor may re-define lot size for reasons such as, but not limited to, change in contract quantities or interruption of the work. Take 1 sample during production of each sublot and utilize it to determine di sposition of the lot in which it occurs.
f.Increased Lot Size. After 8 consecutive sublots have been produced with the tolerances shown for all mix characteristics listed in TABLES 613-5 and 613-6 , the sublot size may be increased by the Contractor to 500 tons each of asphalt mixture (lot size 2,000 tons), provided normal production rate of the plant is over 200 tons per hour. Immediately notify the Engineer of lot size change. If subsequent test results fall outside the tolerances
Source: Kansas Standard Specifications for State Road and Bridge Construction, 2015 Edition. Pages 313–314 of 978.