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 613 – ULTRATHIN BONDED ASPHALT SURFACE
600-78 shown for any mix characteristics listed in TABLES 613-5 and 613-6 , the sublot size will be decreased to 400 tons.
When the increased lot size criteria are again met, the sublot size maybe increased to 500 tons.
g.Pre-Production Mix. Test and evaluate a pre-production mix, limited to a maximum of 200 tons from each plant before production of that mix. Evaluate the pre-production mix at in itial start-up and af ter suspension of production resulting from failing test results. Limit pre- production quantities to 100 tons following a suspension of production. Provide a pre-production mix that complies with the "Single Test Value" in TABLES 613-5 and 613-6 . Except for initial start-up, normal delivery of material to the project before completion of certain test results on pre- production mixes may be authorized by the DME. At the direction of the Engineer, remove the pre-production mix if it is both out of specification and the material shortens the pavement life or changes the intended function. The Engineer will pay for the replacement of one pre-production mix at 100% of the contract unit price. The payment will be full compensation to the Contractor for the placement and removal of that pre-production mix. KDOT will not be financially responsible for any subsequent failed pre-production mixes (that require removal) for that mix. The removed material is the property of the Contractor. The Engineer will not pay for pr e-production mixes that are requir ed to be replaced due to poor workmanship or equipment failure. The Engineer will make the final decision to remove a failed pre-production mix with input from the Contractor.
h.Suspension of Mix Production. Suspend production of the mix until appropriate corrections have been made, if 2 consecutive test results for any single mix characte ristic fail to fall within the limits established by the tolerances shown in the single test value column of TABLE 613-5 . Additionally, suspend production of the mix until appropriate corrections have been made, if any 3-po int moving average value for any single mix characteristic fails to fall within the limits established by the toleran ces shown in the 3-point moving average value column of TABLE 613-5 . Production remains suspended pending the satisfactory results of a pre-production mix, unless waived by the DME. When the mix fails to meet the criteria listed in TABLE 613-5 , identify the cause and document, in detail, what corrective action was taken. The JMF may only be adjusted, when requested by the Contractor, and when approved by the Engineer. For signifi cant changes in the JMF, as determined by the Engineer, a new mix design may be required by the Engineer before the JMF is approved. The Engineer may stop production of HMA at any time the mix or process is determined to be unsatisfactory. Make the necessary corrections before production will be allowed to resume. Failure to stop production of HMA subjects all subsequent material to reje ction by the Engineer or acceptance at a reduced price, as determined by the Engineer. 613.8 MEASUREMENT AND PAYMENT
a.Ultrathin Bonded Asphalt Surface. The Engineer will measure UBAS by the ton of material at the time of delivery to the road. Batch weights will not be allowed as a method of measurement, unless all the following conditions are met: the plant is equipped with an automatic printer system approved by the Engineer; the automatic printer system prints the weights of material delivered; and the automatic printer system is used in conjunction with an automatic batching and mixing control system approved by the Engineer. Provide a weigh ticket for each load. Due to possible va riations in the specific gravity or weight per cubic foot of the aggregates, the tonnage used may vary from the proposal quantities and no adjustment in contract unit price will be made because of such variances. Payment for "HMA Surface (Ultrathin Bonded)" at the contract unit prices is full compensation for the specified work including quality control testing. Sideroads, entrances and mailbox turnouts that are not shown in the Contract Documents that are to be surfaced shall be paid for at 1½ times the unit price for "HMA Surface (Ultrathin Bonded)".
b.Emulsified Asphalt. The Engineer will measure emulsified as phalt used for tack by the ton. Payment for "Emulsified Asphalt (Emulsion Bonding Liquid)" at the contract unit price is full compensation for the specified work. 613 – ULTRATHIN BONDED ASPHALT SURFACE
600-79 c. Quality Control Testing (HMA). The Engineer will measure Quality Control Testing (HMA)
performed by the Contractor on a per to n basis of UBAS placed on the project. No adjustment in the bid price will be made for overruns or underruns in the contract quantity. The bid price w ill constitute payment for all necessary mix design testing, field process control testing, the testing laboratory and all necessary test equipment. Payment for "Quality Control Testing (HMA)" at the contract unit price is full compensation for the specified work. 614 – HMA BASE (REFLECTIVE CRACK INTERLAYER (RCI)
600-80 Section 614
HMA BASE (REFLECTIVE C RACK INTERLAYER (RCI)) 614.1 DESCRIPTION Construct the HMA-reflective crack interlayer ( RCI) as designated in the Contract Documents. BID ITEMS UNITS HMA-RCI (PG 70-28 RCI) Ton Quality Control Testing (HMA) Ton 614.2 CONTRACTOR QUALITY CONTROL REQUIREMENTS Perform quality control testing according to subsection 602.2 . Develop control charts for the mix characteristics listed in Table 614-7 . 614.3 MATERIALS
a.Asphalt Binder. Provide PG 70-28 RCI binder that complies with SECTION 1202 , with this exception: Post a legible copy of the latest bill of lading fo r the Asphalt Binder on or near the gyratory compactor. Use the mixing and compaction temperatures shown on the bill of lading; however, the maximum mixing or compaction temperature is 340ºF, unless otherwise approved by the Field Materi als Engineer. Notify the Engineer if the mixing or compaction temperature changes. Exception: The mixing temperature may be increased no more than 10oF above the maximum mixing temperature shown on the bill of lading provided all the following are met:
1.The air temperature is below 70oF
2.The plant has not produced mix earlier in the day.
3.Do not exceed a mix temperature of 350oF.
4.No truck has returned for its second load of the day. Once a previously loaded truck returns for its next load, reduce the temperature to not higher than the maximum mix temperature shown on th e bill of lading, not to exceed 340oF.
b.Reclaimed Asphalt Pave ment (RAP) and Recycled Asphalt Shingles (RAS). Do not use RAP or RAS in the RCI.
c.Aggregates . Provide aggregates that comply with SECTION 1103 .
d.Combined Aggregates. Provide combined aggr egates for the mixes requ ired in the Contract Documents as shown in TABLE 614-1 . Mixes may use any combination of aggregate and mineral filler supplements complying with the applicable requirements in TABLES 1103-1 and 1103-2 . Provide materials with less than 0.5% moisture in the final mixture. The maximum quantity of crushed steel slag used in the mix is 50% of the total aggregate weight. Natural sand shall be called SSG-1, SSG-2, etc. in the mix design.
e.Contractor Trial Mix Design. A minimum of 10 working days before the start of HMA production, submit in writing to the DME for review and approval, a proposed JMF for each combin ation of aggregates. For each JMF submitted, include test data to demonstrate that mixtures comply ing with each proposed JMF shall have properties specified in TABLE 614-1 for the designated mix type at the Recommended Percent Asphalt (P br). Submit the proposed JMF on forms provided by KDOT. Submit the worksheets used in the design process to include at a minimum the mix properties listed in TABLE 614-2 . Contact the DME to determine if additional information should be submitted. Provide sufficient material as identified in TABLE 614-3 . Submit for the Engineer’s review and approval, the test data listed in TABLE 614-4 for each blend and the pr oposed JMF. Provide a mix that meets the requirements in TABLE 614-5 .
Source: Kansas Standard Specifications for State Road and Bridge Construction, 2015 Edition. Pages 314–317 of 978.