for Highway Construction Page 199 of 715 SECTION 402 – PRIME COAT
402.01 Description.
Prepare and treat an existing surface with asphalt and blotter as specified.
402.02 Materials.
Provide asphalt of the type and grade specified in 702 . The Engineer will accept the asphalt at the point of delivery. Provide blotter as specified in 703 . The Engineer will accept material at the point of delivery from the Contractor -provided s ources or from designated sources.
402.03 Construction Requirements.
Do not apply asphalt if surface or weather conditions can prevent proper construction. Provide distributor equipment as specified in 406.03. Shape the surface to be primed to the required grade and section. Ensure it is uniformly compact and without ruts, c orrugations, segregated material, or other irregularities. Obtain approval of quantities , rates of application, temperatures, and areas to be treated before prime coat application. Apply asphalt to the width of the section to be primed with a pressure distributor in a uniform, continuous spread. Do not exceed the specified asphalt application rate at the spread overlap junction. Correct skipped areas or deficiencies. Provide for 1- way traffic on the untreated portion of the surface when traffic is maintained. Transfer traffic to the treated portion as soon as the asphalt has been absor bed by the surface and will not pick up, and then prime the remaining width of the section. If a roadw ay must be used by traffic but the asphalt does not penetrate after application of the prime coat , spread blotter with a self -propelled aggregate spreader supported by at least 4 wheels equipped with pneumatic tires on 2 axles, as approved. Equip the aggregate spreader with positive controls so the required amount of material will be depos ited uniformly over the full width required to absorb the ex cess asphalt.
402.04 Method of Measurement.
The Engineer will measure acceptably completed work as follows:
1.Asphalt will be by the ton.
2.Blotter will be by th e ton or cubic yard.
402.05 Basis of Payment .
The Department will pay for accepted quantities at the contract unit prices as follows: Pay Item Pay Unit ____ Emulsified Asphalt for Prime Coat ................................................. Ton Blotter ..................................................................................................... Ton or CY for Highway Construction Page 200 of 71 5 SECTION 403 – CHIP SEAL COAT WARRANTY
403.01 Description.
Construct a chip seal at least 1 layer of asphalt followed by 1 layer of aggregate . Warrant the quality of work and materials against contractor -obligated defects (COD) for the warranty period as specified in this section. Noncontractor -obligated defects (NCOD) will not count against the warrantied work. Applying a fog seal over the chip sealed area is at the discretion of the Contractor unless otherwise specified. A chip seal area determined to be a catastrophic failure will be repaired and the warranty will be extended for an additional year. The chip seal work will be evaluated using the current version of the Department’s Chip Seal C oat Warranty Guide.
403.02 Materials.
Provide materials in accordance with the following:
1.Asphalt ic binder. Meet the requirements of 702.03. Type, grade, and other binder characteristics (e.g., viscosity, chemical composition) of the binder is the Contractor’s option.
2.Use the specified class of aggregate, meet quality requirements in 703.01, and gradation in
703.06 1.
Submit the f ollowing quality control tests: Table 403.02- 2 – Contractor -Provided Tests Test Test Method Frequency Point of Sampling Specifications Gradation AASHTO T 27 1 test minimum per 400 tons From crusher Cover Coat Aggregate See Table 703.06-1 Fracture Count AASHTO T 335 1 test minimum per 400 tons From crusher 70% with at least one fractured face Cleanness Value Idaho IT 72 1 test minimum pe r 400 tons At point of loading the roadway —
3.Submit documentation of the materials (e.g., type and grade of binder) used, control tests charts, and other pertinent data.
403.03 Construction Requirements.
The Contractor is responsible for determining the best method and means to construct the chip seal. Public and private property damage claim(s) will be forwarded to the Contractor for consideration.
A.Existing Roadway Conditions. Before chip sealing, the existing roadway conditions that may result in NCODs will be identified and documented in writing by the Contractor and submitted for approval. Pictures of potential NCOD areas are suggested. If approved, these preexisting conditions will be excluded and not considered CODs. If there is a disagreement between the Engineer and the Contractor on what is expected to be a NCOD, the Contractor will put in writing the disagreement including their reasoning and any supporting documentation (e.g., pictures).
Source: Idaho Standard Specifications for Highway Construction, 2023 Edition. Pages 235–235 of 768.