409.01 Description
Seal coat is the application of a bituminous material, covered with aggregate on an existing roadway surface.
409.01.1 Contract Time
In cases where seal coat and pavement marking application are the only remaining items of work, contract time will be charged in accordance with Subsection 108.07.3 beginning the first working day following the July 4th (Independence Day) holiday. Submit written notice to perform seal coat work prior to the July 4th (Independence Day) holiday or holiday weekend. Time charges in accordance with Subsection 108.07.3 for seal coat work performed prior to the July 4th (Independence Day) holiday will commence on the date indicated in the Contractor’s written notice. In cases where seal coat and pavement marking application are the only remaining items of work as of August 21st, contract time will not be charged after August 20th if seal coat work is not performed. Contract time will be charged in accordance with Subsection 108.07.3, beginning on the day seal coat work begins, from August 21st through August 31st if seal coat work is performed. Submit written notice to perform seal coat work from August 21st through August 31st.
409.02 Materials
409.02.1 General
Furnish aggregate and bituminous materials that are compatible. Submit compatibility test results for each aggregate source for informational purposes. One recommended compatibility test method is MT 322.
409.02.2 Bituminous Material
Furnish material in accordance with Section 702.
409.02.3 Cover Aggregate
Furnish cover aggregate in accordance with Subsection 701.02.8. The responsibility for furnishing the aggregate source is specified in the contract.
409.03 Construction Requirements
409.03.1 Sampling, Testing, and Acceptance
The Project Manager will randomly select samples taken by the Contractor and witnessed by an Inspector, for gradation and fracture testing. Sample from the belt on the chip spreader, in accordance with AASHTO T 2 procedures, or at another location approved by the Project Manager. The following acceptance tests are used: MT 202 Gradation AASHTO T 335 Fracture The quantity of material placed in 192,500 square yards (178,500 m2) is considered equivalent to a 2,500-ton (2,500 MT) lot, and the quantity of material placed in 38,500 square yards (35,700 m2) is considered equivalent to a 500-ton (500 MT) sublot for the purposes of aggregate analysis and acceptance. 409 – SEAL COAT 2020 EDITION V5.1 409-2 The quantity represented by 5 samples is a lot when production schedules and material continuity permit. The Project Manager may establish a lot consisting of a quantity represented by 3 to 7 consecutive random samples when there are short production runs, significant material changes, or other unusual characteristics of the work. Surfacing aggregates are evaluated for gradation and fracture, on a lot-by-lot basis. The upper and lower limits in the gradation table, Table 701-12 are the upper and lower limits in the evaluation formulas. The specified minimum fracture values are the lower limit. Acceptance is made in accordance with Subsection
105.03 2.
409.03.2 Aggregate and Bituminous Material Application Rates
Determine the application rates for aggregate and bituminous material used to complete a test section and the project. Submit the following for informational purposes before starting full production or any time the source of aggregate or bituminous material changes:
1.Aggregate and bituminous material application rates.
2.Bituminous materials supplier’s recommended ambient and pavement surface temperatures.
3.Bituminous material supplier’s recommended application temperature range; and
4.Elapsed time between the application of the bituminous material and the cover aggregate. Before starting full production or after changing sources of either aggregate or bituminous material, complete a test section at least 2,000 feet (0.6 km) long to verify the following:
1.Optimum bituminous material and aggregate application rates.
2.Time frame to complete each phase of the seal coat operation to meet the requirements for opening the roadway to traffic; and
3.Roller type, number of passes and pattern of rolling operations. Do not begin production seal coat work until the test section has been placed and approved by the Project Manager.
409.03.3 Seal Coat Limitations
The following conditions govern seal coat work:
1.Perform seal coat operations between May 1st and August 31st.
2.Do not perform seal coat work during the 48-hour period immediately preceding a holiday or a holiday weekend except for pilot car operation in accordance with Subsection
618.03 11
.
3.Begin seal coat work when both the ambient and pavement surface temperatures meet the bituminous material supplier’s recommended low temperatures. Do not perform seal coat operations when the surface temperature reaches 140 °F or higher.
4.Stop seal coat work at least ½ hour before sunset, to include equipment off of the roadway and placement of traffic control devices for non-construction activities.
5.Do not apply bituminous material to damp or wet roadway surfaces.
6.Do not apply bituminous material to plant mix pavement which has been placed, in accordance with the contract, within the previous 72 hours.
7.Do not apply bituminous material within 72 hours of performing crack sealing. 2020 EDITION V5.1 SEAL COAT – 409 409-3
409.03.4 Protection of Traffic and Highway Structures
Provide traffic control meeting Section 618 and the approved traffic control plan. Provide highway structure protection in accordance with Subsection 410.03.9(B). Provide dust control during sweeping and brooming.
409.03.5 Surface Preparation
Do not apply bituminous material unless the roadway surface is free of all dust, dirt, and foreign material. Remove excess crack seal blotter material placed in accordance with the contract prior to seal coat operations.
409.03.6 Pre-Seal Coat Meeting
Schedule a pre-seal coat meeting to be held on site prior to starting seal coat operations. The minimum required attendees are the superintendent, foreman, other contractor personnel that will supervise the seal coat operations, broom operators, traffic control foreman, and key Department inspection personnel. The purpose of the meeting is to review the specification requirements, lines of communication, aquatic resources, traffic control, seal coat plan, safety, and sampling.
409.03.7 Application of Seal Coat Materials
Apply bituminous material at the rate established by the test section. Apply the bituminous material within the bituminous material supplier’s recommended temperature range. Ensure that transverse and longitudinal joints are smooth and match the adjacent surfaces. Keep meet lines to a minimum. Locate longitudinal joints at the centerline or lane line. Obtain approval from the Project Manager to construct the joint at any other location. For requests to apply full roadway width bituminous and aggregate applications in a single, continuous operation, submit a sequencing plan that ensures the least traffic impact for approval, at least 5 business days before the planned operation. Uniformly apply the cover aggregate on the bituminous material at the rate established by the test section. When constructing longitudinal joints, one recommended method is to cover the joint with aggregate and sweep the aggregate back before applying adjacent bituminous material. When longitudinal joints are covered to permit vehicle cross over, sweep back the cover aggregate to expose the joint before applying adjacent bituminous material.
409.03.8 Warranty
The Contractor warrants the seal coat work. If the seal coat experiences chip loss, tracking, flushing, or bleeding, at any time between the date the seal coat is completed and the 1st Wednesday in December of the same calendar year, perform repairs to the seal coat, and replace pavement markings covered by the repairs at no additional cost to the Department. Areas of cover material loss determined to result from means beyond the Contractor’s control (snow plow damage, tire chain damage, or others) are not considered under these warranty requirements. Final determination regarding cover material loss will be made by the Engineer. When repairs are deemed necessary, reference is made to the Department’s Warranty Administration Guide. Submit a detailed repair plan for approval within 14 calendar days of notification of required repairs. The repair plan must address the area of failure and transitions required to ensure a uniformly bonded, smooth surface. Make warranty repairs in accordance with the provisions of this specification when performing warranty work. Furnish traffic control meeting Section 618 requirements at no additional cost to the Department.
409.03.9 Application of Blotter Material
Monitor the finished seal coat and apply blotter material on live oil areas throughout the specified warranty period. Live oil is defined as bituminous materials that have not fully set or 409 – SEAL COAT 2020 EDITION V5.1 409-4 bonded to cover material particles. Live oil has a glossy appearance and is present in tracking, flushing, and bleeding conditions. Failure to apply blotter material within 24 hours of written notification by the Project Manager will be cause for the Department to have the work performed. Costs incurred by the Department associated with application of blotter material will be deducted from subsequent progress estimates.
409.03.10 Sweeping and Brooming
Provide a roadway free of loose cover material. In curb and gutter sections, remove and dispose of all loose cover material from the roadway and sidewalks. Do not allow material to enter any storm drain system or any aquatic resource. In guardrail sections, do not allow loose cover material to accumulate beneath the rail. Correct surface irregularities affecting the ride quality at the Contractor’s expense.
A.Initial Sweeping and Brooming. Remove all loose cover material before terminating pilot car use, dispose of the material if required. If pavement markings are not placed within 72 hours of completion of the seal coat work, the Department may have work performed and deduct the costs from monies due to the Contractor. Traffic control beyond these 72 hours, unless ordered by the Project Manager, is at the Contractor’s expense. Apply final pavement markings as specified elsewhere in the contract.
B.Final Sweeping and Brooming. Perform final sweeping and brooming operations to remove excess loose material no sooner than 5 calendar days before final pavement markings. Coordinate with the Project Manager to ensure Final Sweeping and Brooming is necessary. Provide traffic control in accordance with Section 618.
409.03.11 Fog Seal
Apply the emulsified asphalt in accordance with Subsection 402.03.9.
409.03.12 Underseal
When required by the contract, perform an underseal following approval by the Project Manager of the prepared surface. Meet the requirements of Section 409 with the following exceptions:
1.The underseal operation may be performed prior to May 1st and after August 31st, on condition that the temperature and weather meet the manufacturer’s recommendations for placement.
2.Meet the requirements of Section 411 when performing an underseal on a milled surface. Do not begin PMS operations until 3 calendar days after the underseal has been completed.
409.04 Method of Measurement
409.04.1 Bituminous Material
Bituminous material used for seal coat work is measured by the gallon (L) or by the ton (MT) in accordance with Subsection 402.04.
409.04.2 Cover Aggregate
Cover aggregate for Type 1, Type 2, and Type 3 is measured by the square yard (m2), based on the length and width of seal coat specified and accepted.
409.04.3 Fog Seal
Bituminous material used for fog seal is measured by the gallon (L) or by the ton (MT) in accordance with Subsection 402.04. 2020 EDITION V5.1 SEAL COAT – 409 409-5
409.04.4 Traffic Control
Traffic control is measured in accordance with Subsection 618.04.
409.04.5 Rolling
Rolling is not measured for payment.
409.04.6 Sweeping and Brooming
Initial sweeping and brooming and the disposal of excess material necessary for traffic control operations as outlined in accordance with Subsection 409.03.10(A) are not measured for payment. Final sweeping and brooming operation is measured by the course mile (CR km). A course mile (CR km) is defined as a roadway portion consisting of 2 travel lanes, adjacent shoulders, and turn lanes (if applicable) for a 1-mile (km) length. Roadways with additional travel lanes or that require less than full width sweeping will be prorated. Traffic control from an approved plan necessary for final sweeping and brooming is measured in accordance with Section 618.
409.04.7 Water
Water used for dust control or wetting chips is not measured for payment.
409.04.8 Blotter Material
Blotter material is not measured for payment.
409.05 Basis of Payment
Payment for the completed and accepted quantities is made under the following: Pay Item Pay Unit Bituminous Material Gallon (L) or Ton (MT) Cover - Type Square Yard (m2) Final Sweep and Broom Course Mile (CR km) Traffic Control See Subsection 618.05
409.05.1 Excess Crushed Cover Aggregate
Sale of excess crushed cover aggregate is the Contractor’s option. The Contractor cannot sell material from Department-owned or Department-optioned sources without a written agreement establishing and providing royalty refunds to the Department. The Department may purchase acceptable unused crushed cover aggregate remaining in the stockpile, if the quantity exceeds 100 tons (100 MT). The conditions of purchase are described in Subsection 109.07 . Haul from the stockpile site to the site selected by the Project Manager will be by the most practical route as determined by the Project Manager. Payment for haul is 15 cents per ton-mile (0.907 MT per 1.6 km) for distances exceeding 2,000 feet (610 m).
Referenced in this section
Sections that cite this one
Seal Coat in other states
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Source: Standard Specifications for Road and Bridge Construction, 2020 (v5.1) Edition. Pages 261–266 of 611. View official source ↗