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). for Highway Construction Page 201 of 71 5 B. Preparation for and Application of Chip Seal.
1.Cover and protect existing manholes, valve casings, road weather information systems (RWIS) sensors, weigh- in-motion site sensors, expansion joints, drains, street monume nts, and other items as directed before chip sealing. Retain and protect cattle guards and weigh- in-motion concrete pads. If protection of these items is not possible, inform the Engineer before chip sealing and request direction. Remove protection after chip seal is complete.
2.Clean the pavement surface before chip sealing.
3.Do not chip seal bridge deck s or approach slabs. After chip seal completion, remove and dispose of asphalt, aggregate , and other material that may have spilled into deck drains and expansion joints .
4.For beginning and ending joints, mask the roadway with effective material (e.g., building paper) to create a fine and def inite transverse line.
5.Meet -lines must be within 1 foot of lane lines or within 1 foot of center of lanes. Meet -lines are not allowed within a wheel path. Ensure transverse and longitudinal joints are smooth and match the adjacent surfaces.
6.Do not apply chips during the 48- hour period immediately preceding a holiday or a holiday weekend. Brooming and pilot car operations are allowed within this 48 -hour period.
7.When not spreading, park the distributor to ensure the spray bar or mechanism will not drip on the surface.
C.Brooming.
1.Broom loose chips from the roadway and other areas listed in 403.03.C.2 at the end of each day’s operations. The Department requires the Contractor to broom at least 2 complete coverages, with the second brooming approximately 24 hours after the first brooming. Additional brooming may be necessary to receive limited chip seal acceptance of the work.
2.Use a mechanical rotary type broom. Use a mechanical pickup or vacuum broom for the following conditions:
a.In curb/gutter and on sidewalk sections.
b.In all guardrail areas.
c.On bridge deck s.
d.Within 100 feet of bridges that span water channels (wet or dry).
e.Within 100 feet of adjacent wetlands and surface waters that reside within the right of way.
f.Maintained shoulder -foreslope areas where the adj acent property owner cares for and maintains turf or lan dscaping.
3.Provide dust control using water or other approved means during brooming.
4.Pick up and properly dispose of excess materials.
5.After the second brooming meets the Department’s satisfaction, the Department will accept the brooming in writin g before opening the road to full speed traffic, unless otherwise directed. for Highway Construction Page 202 of 715 D. Limited Acceptance, Warranty Period, and Warranty. After brooming has been accepted, CODs in the work will be documented. The CODs that do not exceed the COD threshold may be left to monitor or be repaired. The CODs in excess of the COD threshold will be repaired before limited chip seal coat warranty accep tance is granted. The Department will acknowledge in writing limite d chip seal coat warranty acceptance along with any noted CODs or NCODs. In the event of a disagreement between the Department and the Contractor on what is expected to b e a NCOD, the Contractor will put in writing the disagreement including their reasoning and any supporting documentation (e.g., measurements, pictures). The warranty period begins upon receipt of the written limited chip seal coat warrant y acceptance and continues until April 1 of the following year. If CODs are documented before warranty repair work and the CODs continue to spread or magnify after April 1, all CODs must be repaired. It is the Department’s and the Contractor’s responsibility to monitor, document, and communicate the emergence of NCODs or CODs throughout the warranty period. The Department and the Contractor will evaluate and photo document the roadway before snow plow season. If NCODs or CODs are discover ed during the warranty period, the Engineer and the Contractor will notify the other party in writing of their discoveries. The Department will use its resources to handle insignificant warranty repair work (e.g., applying blotter after the limited chip seal coat warranty acceptance) at t he request of the Contractor and the availability of the Department’s resources. Costs incurred by the Department for roadway maintenance of the chip seal directly associ ated to any CODs will be deducted from subsequent progress estimates. During the warranty period, if the Department or the Contractor determine chip loss is beyond reasonable and resulting in windshield damage or other safety concerns to traveling motorist s, the Contractor will re- broom as needed, coordinate with the Department to re -broom, or submit a repair solution for approval that resolves the safety concerns as soon as practical.
E.COD Threshold Determination. The Contractor warrants that the chip seal (travel lanes, shoulders, turning lanes, and other areas as specified) will have a total COD area within the allowable limits for the warranty period. In April following the Engineer’s limited chip seal coat warranty acceptance or sooner if conditions warrant, the Contractor will arrange a meeting wi th the Engineer, if necessary, to conduct an onsite evaluation to review and document NCODs and CODs. The Engineer will provide in writing the final decisions on wh at repairs are required in accordance with the Department’s current version of the Chip Seal Coat Warranty Guide and 105.03. Warranty repair work will be required if the total COD area exceeds the specified threshold of 1.5 percent or more than 1 of the following guidelines is met:
1.If separate COD areas total approximately 50 s quare yards in a 0.1 mile section and there are other CODs under consideration.
2.If an individual COD area is greater than 100 square yards in total area and ther e are other CODs under consideration.
3.If there are regularly occurring individual CODs and there are other CODs under consideration.
4.If a COD is linear in nature, regardless of width (approximately 300 feet or more) and there are other CODs under consideration. for Highway Construction Page 203 of 71 5 If the Department determines the required repair work will not benefit the traveling public, and if agreed by both parties, financial reparation will be considered instead of repair work at a cost of 2 times the bid amount price per square yard.
F.Warranty Repair. If it is determined that the CODs threshold is exceeded, submit a repair plan and repair schedule for approval before starting repairs. Complete repairs by August 31. If repairs cannot be made by August 31 due to events outside the control of both parties as specified in 107.11, both parties will agree to an acceptable repair by date. Perform warranty repair work as approved in the Contractor’s repair plan at no additional cost to the Department. The repair may be localized or be full reconstruction depending on the CODs identified. Use the same source for any localized warranty repair work as the original source. If this is not possible, the Engineer will consider other sources that have similarly colored aggregate. Warranty work includes replacing all pavement markings and any other permanent features that are damaged or obliterated due to the chip seal failure or repair process at no additional cost to the Department. The Engineer will terminate the chip seal coat warranty when the chip seal is accepted or the required warranty repair work has been completed. The chip seal coat warranty does not apply to the warranty repair work.
G.Pavement Markin gs. Pavement markings will be applied in accordance with Department standards and the MUTCD.
H.Catastrophic Failure and Repair. A catastrophic chip seal failure is defined as a total COD area that equal or exceeds the specified threshol d of 40 percent. If a limited acceptance chip seal coat warranty was already issued before the catastrophic failure occurred, the limited acceptance will be immediately revoked. Upon completion of the repairs, a new limited chip seal coat warranty acceptance will be made and only the catastrophic areas repaired will have an extended warranty period. The repair plan of a catastrophic chip seal coat failure will be approved by the Engineer and may include removing the remaining chips before re- chip sealing the roadway (e.g., if there is little confidence the remaining chips will stay imbedded in the roadway) and applying a fog coat. As needed, brooming will be required until the repair is completed. If the Department determines the required repair work will not benefit the traveling public, and if agreed by both parties, financial reparation will be considered instead of repair work and the extended warranty at a cost of 2 times the bid amount price per square yard.
403.04 Method of Measurement.
The Engineer will use plan quantity of acceptably completed work by the square yard.
403.05 Basis of Payment .
The Department will pay for accepted quantity at contract unit prices as follows: Pay Item Pay Unit Chip Seal Coat Warranty ........................................................................ SY for Highway Construction Page 204 of 71 5 The warranty repair work, including the necessary traffic control and striping, will be at no additional cost to the Department. Work associated with chip sealing is incidental, includin g:
1.Cleaning the pavement surface.
2.Protecting existing manholes, valve casings, street monuments, and RWIS sensors. Remove and dispose materials used for protection after chip sealing is completed.
3.Restori ng items that were not properly protected
4.Providing and applying materials, including asphalt , cover coat aggregates, and blotter , if necessary.
5.Water applications.
6.Brooming.
7.Maintaining the roadway surface until receipt of written limited acceptance.
8.Removing and disposing excess material.
9.All other work necessary to chip sealing. The Contractor is eligible to receive 100 percent of payment for work completed after limited acceptance has been issued. The Contractor’s performance bond will be used as the chip seal warranty bond. The entire value of the performance bond must remain in effect for the duration of the chip seal coat warranty. The Department will release the performance bond as specified in 103.04 after the Engineer terminates the c hip seal coat warranty. for Highway Construction Page 205 of 71 5 SECTION 404 – SURFACE TREATMENT
404.01 Description.
Construct a single or multiple course surface treatment that may consist of the application of 1 or more chip seal coats or may consist of a prime coat followed by 1 or more chip seal coats as follows:
1.Type A: Apply a chip seal coat .
2.Type B: Apply a prime coat followed by the application of a chip seal coat .
3.Type C: Apply 2 chip seal coat s.
4.Type D: Apply a prime coat followed by the application of 2 chip seal coats. A fog coat may be constructed on any of the types of surface treatments, as specified.
404.02 Materials.
Provide materials as specified in: Asphalt .................................................................................................................................... 702.01 Emulsified Asphalt .................................................................................................................. 702.03 Anti-Stripping Additive ............................................................................................................. 702.04 Aggregate for Cover Coat Material .......................................................................................... 703.06 Aggregate for Blotter and Aggregate for Choke Sand ............................................................. 703.07 Provide asphalt of the type a nd grade specified. Provide asphalt and anti -stripping additive, if required, as specified in 702 . The Engineer will accept the asphalt at the point of delivery. The emulsified asphalt is subject to viscosity and sieve testing by the Department, in the field or at a location other than the project site. Schedule the delivery time to allow testing before usage. Expect delays up to 1 hour for this testing. Provide cover coat m aterial , blotter, and choke sand as specified in 703. The Engineer will accept the cover coat material, blotter, and choke sand at the point of loading for delivery to the roadway. Submit a chip seal coat design for each stockpile using the McLeod method at least 2 weeks before construction. Field- verify the chi p seal coat design for spread rate of asphalt and aggregate.
404.03 Construction Requirements.
A.Chip Seal Coat . Do not apply asphalt if the roadway surface or weather conditions can prevent satisfactory construction. Do not start chip sealing unless the pavement surface temperatures are 80°F and rising, and do not chip seal when pavement surface temperature exceeds 140°F, unless authorized i n writing . If bleeding becomes apparent on the completed chip seal, start immediate maintenance and traffic control, and do not continue chip sealing until corrective action has been started. Do not apply chip seals when the wind velocity exceeds 15 mph without written approval . Do not apply chip seals before June 15 or after September 1.
Source: Idaho Standard Specifications for Highway Construction, 2023 Edition. Pages 236–240 of 768.