177 SECTION 407 DESCRIPTION
407.01.01 General. This work consists of applying a bituminous material seal coat and sand blotter as required.
MATERIALS
407.02.01 Bituminous Material. The bituminous material shall conform to the applicable requirements of
Section 703. Unless otherwise specified, the bituminous material for the seal coat shall be Emulsified Asphalt, Type SS-1h (Diluted); however, Emulsified Asphalt, Type SS-1 (Diluted), Emulsified Asphalt, Type CSS-1 (Diluted), Emulsified Asphalt, Type CSS-1h (Diluted), or Emulsified Asphalt, Type CQS-1nv (Diluted) may be substituted. Regardless of the option chosen, emulsified asphalt will be measured and paid for under the bid item and at the contract unit price bid per metric ton (ton) for Emulsified Asphalt, Type SS-1h (Diluted) and no further compensation shall be allowed therefore. Emulsified asphalt (diluted) shall be proportioned and mixed according to Subsection 405.02.01.
407.02.02 Sand Blotter. Sand blotter shall meet the requirements of Subsection 705.03.05. The material may
be accepted in stockpile at the source. CONSTRUCTION
407.03.01 Equipment. Equipment for heating and applying the bituminous material shall meet the
requirements of Subsection 405.03.01.
407.03.02 Weather Limitations. Do not apply bituminous material on a wet surface, or when atmospheric
temperature is below 10 °C (50 °F), or when weather conditions would prevent proper construction of the seal coat.
407.03.03 Preparation of Surface. Clean the entire width of surfacing of all dirt and loose material by sweeping
with power brooms supplemented by hand brooms if necessary.
407.03.04 Application of Bituminous Material. Uniformly apply the bituminous material in one operation to
the entire width of one designated traffic lane at a time. The temperature of the bituminous material shall conform to Subsection 406.03.04. Apply the seal coat in such manner as to offer the least inconvenience to traffic and to permit one-way traffic without pickup or tracking of the bituminous material. When a surface treatment is to be applied to the travel lanes, apply the seal coat to the shoulder at least 4 days in advance of the application of the adjacent surface treatment requiring screenings. Apply in such a manner that the joint between the surface treatment and seal coat will present a neat and uniform appearance true to the line shown on the typical cross section. Apply the seal coat over the surface treatment not sooner than 3 days, nor more than 7 days after completion of the final brooming as specified in Subsection 408.03.10.
407.03.05 Application of Blotter Material. When necessary for traffic, spread blotter material in the amounts
required to absorb any excess bituminous material. METHOD OF MEASUREMENT
407.04.01 Measurement. Bituminous material will be measured by the metric ton (ton).
Emulsified asphalt (diluted) will be measured by the metric ton (ton) of diluted mixture. Sand blotter will be measured by the metric ton (ton) or cubic meter (cubic yard). 407 SEAL COAT 178 BASIS OF PAYMENT
407.05.01 Payment. The accepted quantities, measured as provided above, will be paid for at the contract
price per unit of measurement for the pay items listed below that are shown in the proposal. Payment will be full compensation for the work prescribed in this Section. When sand blotter is not included in the proposal and it is needed to protect the work or public traffic, payment will be made according to Subsection 104.03. Payment will be made under: Pay Item Pay Unit Cutback Asphalt (type) ................................ ................................ ................................ ................................ .................... Metric Ton (Ton) Emulsified Asphalt (type) ................................ ................................ ................................ ................................ ................. Metric Ton (Ton) Sand Blotter ................................ ................................ ................................ .......................... Metric Ton (Ton), Cubic Meter (Cubic Yard) 179 SECTION 408 SURFACE TREATMENT DESCRIPTION
408.01.01 General. This work consists of an application of bituminous material and cover of screenings applied
on a previously compacted and bonded bituminous surface. This work also consists of the production and stockpiling of screenings. MATERIALS
408.02.01 Bituminous Material. The type and grade of bituminous material will be specified in the contract.
The bituminous material shall meet the applicable requirements of Section 703. Submit a 3.75 L (1 gal) sample of emulsified bituminous material for approval at least 14 days before use.
408.02.02 Field Testing for Acceptance. The Engineer reserves the right to selectively test emulsified
bituminous materials for Saybolt Furol Viscosity at the job site or at any other designated area before application. Equip delivery trucks and trailers supplying emulsified bituminous materials with a sampling valve that provides a sample from the approximate mid-point of the load . Sample valves shall conform to AASHTO T40. If a sampling valve is not provided, samples may be obtained by the dip method according to Test Method No. Nev. T723. All samples are to be provided by the driver and the sampling process is to be observed by the Engineer. Sample bottles will be provided. When tested for Saybolt Furol Viscosity, the specification limits contained in Subsection 703.03.04 will be used as the basis for using or rejecting the material and the demerit schedule for Saybolt Furol Viscosity will not apply. If the material fails to meet specification limits, a second test will be run on the same sample. If the second test also fails, the material represented by that sample will be rejected and returned to the supplier. No payment will be made for rejected material or for the shipping or handling thereof. Do not blend any rejected material. Samples representing material that is accepted for use on the project will be forwarded to the Department’s Materials Division for further testing (excluding Saybolt Furol Viscosity tests) and the regular demerit schedule will apply.
408.02.03 Screenings. Screenings shall meet the requirements of Subsection 705.03.04, for the size
specified. Submit screenings for testing a minimum of 14 days before use. CONSTRUCTION
408.03.01 Distributors. The distributor shall meet the requirements of Subsection 405.03.01. Calibrate the
distributor for transverse and longitudinal application rates according to ASTM D2995 Test Method A or B, or other calibration method as approved. Verify calibration a s directed.
408.03.02 Aggregate Spreader. The aggregate spreader shall be self-propelled and supported by at least 4
wheels equipped with pneumatic tires on 2 axles. Equip the aggregate spreader with positive control so that the required amount of material will be deposited uniformly over the full width of the bituminous material. On divided highways, operate the aggregate spreader against the flow of traffic in order to allow the hauling trucks to enter and leave with the flow of traffic. Calibrate the aggregate spreader according to ASTM D5624, or other calibration method as approved, at a rate to apply the quantity of cover aggregate as specified . Verify calibration as directed.
408.03.03 Rollers. On a new surface, operate with each aggregate spreader, two pneumatic tired rollers and
one steel wheel roller. On an old surface, operate no less than three pneumatic tired rollers and no steel wheel rollers. The pneumatic tired roller shall meet the requirements of Subsection 401.03.04 (b). The steel wheel roller shall meet the requirements of the Subsection 401.03.04 (a) or (c). Additional rollers may be required if the aggregate placement rate exceeds the capabilities of the initial rollers.