610 - DOUBLE ASPHALT SURFACE TREATMENT
600-60 m. Maintenance of Completed Work. Maintain the completed surface for a period of 5 days after the
project or portions of the project are open to traffic. If fo r reasons beyond the Contractor’s control, traffic can not be routed over the work upon completion of the project, maintain the surface for a period of 5 days after completion of the second seal coat. Maintenance consists of the following:
1.Make one, complete coverage each day of the 5 days after the project or porti ons of the project are open to traffic with a light blade equipped with broom drag followed by a pneumatic roller. If weather and roadbed conditions are such that the dragging and rolling would not be beneficial to the surface the daily dragging and rolling may be omitted with approval of the Engineer.
2.The application of additional asphalt material, aggreg ate, dragging and rolling or all of these operations may be required. Asphalt material and aggregate ordered by the Engineer used in the maintenance work will be included in the quantities of these materials for which payment is to be made. Additional manipulation required for the maintenance work will not be paid for separately, but will be considered as subsidiary work to the item of "Manipulation (D.A.S.T.)" included in the Contract Documents.
n.Treatment of Adjacent Areas. When shown in the Contract Documents, perform the second seal on the same areas as the first seal, including existing inters ections and entrances, mailbox turnouts, all widened areas etc. Asphalt and cover material for this work is incl uded in the contract quantities and will be paid for at the contract unit.
o.Maintenance of Traffic. Maintain traffic according to DIVISION 800 and the following. Coordinate all construction operations to result in the least practicable delay of traffic. Maintain one-way traffic and restrict traffic speeds to 30 MPH on bare pavement and 20 MPH on freshly applied seal. Use pilot cars to lead one-way traffic through the areas of distribution and curing. Coordinate the work so the pilot car completes a round trip in 15 minutes or less. Do not delay traffic at more than 2 separate locations of work on a project. Station one flagger immediately ahead of the ap plication of the asphalt material and one flagger immediately behind the section being cured. Move the signs and flaggers forward as the work progresses. Complete all brooming activities before opening the traveled way to unrestricted traffic. On projects where asphalt sealing is constructed in connection with other work from which traffic is detoured, the provisions of this subsection do not apply. Restrict the speed of all equipment traveling on the freshly applied seal to 20 MPH for 24 hours.
p.Seasonal and Weather Limitations.
1.Construct asphalt sealing using cutback asphalt between May 1 and October 15, when the ambient air temperature is 60ºF and rising.
2.Construct asphalt sealing using emulsified asphalt between June 1 and September 15, when the ambient air temperature is 60ºF and rising, and the pavement temperature is a minimum of 70ºF.
3.Construct asphalt sealing using asphalt cement between June 1 and September 1, when the ambient air temperature is 70ºF and rising, and the pavement temperature is a minimum of 80ºF. When aggregate retention is unsatisfactory, suspend sea ling. Do not seal when the surface is wet, or the weather is foggy or rainy. These limitations may be modified with written approval from the Engineer. If the seal is damaged or lost, due to rain or we t pavement, repair or re-seal the damaged pavement.
q.Pavement Smoothness. Double asphalt surface treatment is excl uded from profilograph testing, and not eligible for pay adjustments. 610.4 MEASUREMENT AND PAYMENT The Engineer will measure cover material by the cubic yard. The material will be measured in the vehicle at the time and place of unloading. No deductions will be made for moisture in the cover material. The Engineer will measure asphalt material by the ton. Deductions will be made for the number of tons that are not placed on the road surface. The Engineer will measure manipulation by the Station, along the centerline. On divided highways, the Engineer will measure manipulation by th e Station, along the centerline of each divided direction. This includes all widened and irregular areas and irregular variations in depth. The Engineer will measure ordered water by the M Gallo n by means of calibrated tanks or water meters. 610 - DOUBLE ASPHALT SURFACE TREATMENT
600-61 Payment for "Cover Material", "Cutback Asphalt", "Emulsified Asphalt", "Asphalt Cement" and
"Manipulation (D.A.S.T.)" at the contract unit prices and "Water (Flexible Paveme nt) (Set Price)" at the contract set unit price is full compensatio n for the specified work. When the Contract Documents call for asphalt cement for asphalt sealing, the following provisions apply: If the work is not completed by September 1, and when ordered by the District Engineer in writing, change the type of asphalt material to cutback asphalt. If approved changes are made, the unit price for cutb ack asphalt will be the contract price for asphalt cement plus or minus the difference in the invoice pric e of the two materials at the refinery at the time of application. Such measurement and payment is full compensation for the work specified. 611 - HOT MIX ASPHALT (HMA)-COMMERCIAL GRADE
600-62 Section 611
HOT MIX ASPHALT (HMA)-COMMERCIAL GRADE 611.1 DESCRIPTION Construct the designated class of HMA-Commercial Gr ade asphalt pavement, as shown in the Contract Documents. Class A HMA-Commercial Grade is intended for all areas that are not Class B locations. Class A includes permanent traffic areas and temporary tr affic areas with moderate to high volumes of vehicular traffic such as driving lanes, auxiliary lanes and shoulders. Class B HMA-Commercial Grade is in tended for non-traffic areas and sh ort-term temporary traffic areas with a low volume of vehicular traffic. B I D I T E M S U N I T S HMA–Commercial Grade (Class *) Ton HMA–Commercial Grade (Class *) (Patching) Ton *A or B 611.2 MATERIALS
a.Aggregates. Provide individual aggregates that comply with DIVISION 1100 .
b.Asphalt. Provide performance graded asphalt binder that complies with DIVISION 1200 . Provide asphalt for tack coat suitable for th e intended use and approved by the Engineer.
c.Mix Design. Using forms provided by KDOT, submit a mix design for the designated class of HMA- Commercial Grade to the DME for revi ew and approval. When requested by the Engineer, submit a sufficient quantity of materials to verify the mix design. Submit a mix design that complies with these requirements: (1) TABLE 611-1 , Class A and Class B HMA-Commercial Gr ade Mix Criteria: Unless the Engineer approves otherwise or shown elsewhere in the Contract Documents, use a SM-12.5A or SR-12.5A ( TABLE 611-2 ) for Class A. Use any mix designation listed in TABLE 611-2 for Class B. TABLE 611-1: HMA-COMMERCIAL GRADE CLASS A and CLASS B MIX CRITERIA CLASS A CLASS B AGGREGATE: Coarse Angularity (min.%) 75 50 Uncompacted Voids-Fine (min. %) 42 40 Sand Equivalent (min. %) 40 40 Natural sand (max. %) 35 - Reclaimed Asphalt Pavement (RAP) (max. %) 25 50 Binder: PG64-22 or PG58-281 PG58-28 or PG64-22 COMPACTION REVOLUTIONS: (A)3 (B)3 Nini 7 6 7 Ndes 75 50 75 Nmax 115 75 115 Level of Compaction at N ini ≤90.5 ≤91.5 ≤91.5 MIX: VFA 65 – 78 66-80 65 – 78 Tensile Strength Ratio (TSR) (min. %) 802 - - 1In permanent locations with an asphalt mixture containing Recycled Asphalt Shin gles (RAS) or 16% to 25% RAP, use PG58-28. In all other locations, the Contr actor may use either grade of binder. 2Meet the minimum TSR requirement for design only. Depending on the anticipa ted exposure to the environment, the DME may waive the TSR requirement. 3Use either column A or B, Contractor’s option. 611 - HOT MIX ASPHALT (HMA)-COMMERCIAL GRADE
600-63 If RAP or RAS is used, inform the Engineer as to the source and type of RAP and RAS. Provide RAP that
is reasonably free of contamination, uniform in composition (similar to RAP gradation shown on mix design) and has passed through a 2 ¼" screen or grizzly. The Engin eer will accept the RAP and RAS based on a visual inspection. The Engineer may approve the use of an asphalt mixture (listed in TABLE 611-2 ) that is produced, tested and complies with SECTION 602 . If used, QC/QA testing is required.
2.TABLE 611-2 , Mix Design Requirements. TABLE 611-2: MIX DESIGN REQUIREMENTS (Master Grad ing Limits and VMA) Nominal Maximum Size & Mix Designation Percent Retained - Square Mesh Sieves Min. VMA (%)1" 3/4 " 1/2 " 3/8 " No. 4 No. 8 No. 200 SM-9.5A 0 0-10 10 min. 33-53 90.0-98.0 14.5 SR-9.5A 0-2 0-10 10 min. 33-53 90.0-98.0 14.5 SM-9.5T 0 0-10 10 min. 53-68 90.0-98.0 14.5 SR-9.5T 0-2 0-10 10 min. 53-68 90.0-98.0 14.5 SM-12.5A 0 0-10 10 min. 42-61 90.0-98.0 13.5 SR-12.5A 0-2 0-10 10 min. 42-61 90.0-98.0 13.5 SM-19A 0 0-10 10 min. 51-65 92.0-98.0 13.0 SR-19A 0-2 0-10 10 min. 51-65 92.0-98.0 13.0 Meet the minimum VMA requirements with design only. Use an air void target of 4% (at N des) to establish binder content. Using the combined gradation (RAP and RAS, if any, and virgin aggr egate), select a single point for each sieve within the master gradin g limits and the No. 16, No. 30, No. 50 and No. 100 sieves. Also, provide the combined virgin aggregate gradation. When controlling a virgin mix by cold feed gradation testing, apply single point tolerances in TABLE
611-3 to the design single points for the virgin aggregate. Do not ex ceed the tolerances for the Master
Grading Limits. When controlling a mix that contains RAP or RAS by cold feed virgin gradation testing, apply single point tolerances in TABLE 611-3 to the design single points for the virgin aggregate. The tolerances may exceed the Master Grading Limits. If RAP is used, calculate the Effective Specific Gravity (G se) of the RAP as shown in subsection 5.10.4 – Calculations for the Marshall Mix Design of Bituminous Mixtures, Part V and used as the G sb of the RAP. If RAS is used, calculate the Effective Specific Gravity (G se) of the RAS as shown in subsection 5.10.4, Part V and use as the G sb of the RAS. TABLE 611-3: SING LE POINT TOLERANCES Nominal Maximum Size & Mix Designation Percent Retained - Square Mesh Sieves 3/8" No. 4 No. 8 No. 16 No. 30 No. 50 No. 100 No. 200 SM-9.5A or SR-9.5A ±5 ±5 ±5 ±4 ±4 ±3 ±2 SM-9.5T or SR-9.5T ±6 ±5 ±5 ±4 ±3 ±3 ±2 SM-12.5A or SR-12.5A ±6 ±6 ±5 ±5 ±4 ±4 ±3 ±2 SM-19A or SR-19A ±6 ±6 ±5 ±5 ±4 ±4 ±4 ±2 Comply with the certification requirements for the appr opriate categories listed in the Policy and Procedure Manual for the Certified Inspection and Testing Training (CIT2) Program. Use calibrated testing equipment with prescribed procedures in the KDOT Construction Manual, Part V, Section 5.2.7.
Source: Kansas Standard Specifications for State Road and Bridge Construction, 2015 Edition. Pages 297–300 of 978.