A06_NIFC_Campus_Slurry_Seal__North_Areas_SPEC.pdf

NIFC Campus Slurry Seal, North Areas 21MAY2024

PART 1 – GENERAL INFORMATION

A. Summary: The Bureau of Land Management, National Interagency Fire Center (NIFC), located at 3833 S. Development Avenue, Boise, Idaho, has a requirement for an application of asphalt slurry applied to the existing asphalt concrete pavement surface to renew and seal the surface. Following the slurry seal process, line striping will be performed to establish the campus parking areas and roadways.

This document specifies the characteristics of the material and details the application workmanship.

B. The campus surface is comprised of asphalt concrete (AC) surfacing in a combination of parking areas and roadways. The AC surfacing has received miscellaneous patches and seal coat throughout the years with no formal materials used.

C. Work will be done on 3 parking areas and 1 roadway north of Robinson Road over 60 consecutive days to allow Government to move vehicles and equipment from one area to the next. Contractor will coordinate with COR to ensure government vehicles and equipment are moved.

D. Administration: Overall administration of this contract shall be by the Contracting Officer (CO). The CO will appoint a Contracting Officer Representative (COR) to manage the detailed activities of the contract.

E. Installer qualifications: Work shall be accomplished by companies demonstrating 5 years of slurry experience in the State of Idaho.

F. Description: The slurry seal shall consist of a mixture of an approved emulsified asphalt, mineral aggregate, water, and specified additives, proportioned, mixed and uniformly spread over a properly prepared surface as directed by the COR. The completed slurry seal shall leave a homogeneous mat, adhere firmly to the prepared surface, and have a friction-resistant surface texture throughout its service life.

G. Submittals:

1. Contractor shall submit product data to the Government for review. Submit package a minimum of 1 week prior to scheduled work start date. Allow Government 7 business days to review. Contractor shall not proceed with replacement until receipt of reviewed submittals from the government.

2. Submittal Package shall include:

(a) Asphalt slurry seal materials: emulsified asphalt type and grade, aggregate, anti-strip additives, cover coat material.

(b) Test results for testing indicated.

(c) Pavement paint manufacturers certification that paints and beads meet or exceeds specified requirements.

(d) Project Schedule, describing at a minimum; start date, work schedule for each parking area and roadway, weekend and holiday work expected and total project length.

PART 2 – PRODUCTS

A. JOINT SEALANT

1. ASTM D6690, Type II or III, hot-applied, single-component, polymer-modified bituminous sealant.

B. EMULSIFIED ASPHALT

1. Emulsified asphalt grade CSS-1, CSS-1h, or HFRS-P1 as specified in ASTM D977 or ASTM D2397 or AASHTO M 104 emulsified asphalt.

2. Quality Test:

a) Test on emulsion: ASTM D244, residue after distillation must be 60% minimum.

b) Test on emulsion residue: ASTM 2397, penetration at 77℉, 40-60

c) Each load of emulsified asphalt shall be accompanied with a Certificate of

Analysis/Compliance to assure that it is the same as that used in the mix design.

3. Anti-Strip additive – Product as required to meet the project requirements.

C. MINERAL FILLER

1. Portland cement, hydrated lime, limestone dust, fly ash, or other approved filler meeting the requirements of ASTM D242 shall be used if required by the mix design. They shall be considered as part of the dry aggregate.

D. ADDITIVES

1. Additives may be used to accelerate or retard the break-set of the slurry or to improve the resulting finished surface. The use of additives in the slurry mix

(or individual materials) shall be made initially in quantities predetermined by the mix design with field adjustments approved by COR.

E. AGGREGATE MATERIAL

1. Furnish Aggregate cover material consisting of crushed or uncrushed Rock free of Clay, loam or other harmful substances and meeting the following gradation. Sieve analysis will be determined according to ASTM D75.

F. MIX DESIGN

1. Emulsified-Asphalt Slurry: ASTM D3910, Type 1.

G. PAVEMENT PAINTING

1. Paint to be waterborne with volatile organic compound (VOC) less than 150 g/L.

2. Paint to conform to either the current ITD Waterborne Traffic Line Paint Specifications (Formula No. 14) or to Federal Specification TT-P-1952-D.

3. Federal Standard Colors:

(a) White 37875: parking isles, stop bars, arrows, no parking zones, fog line, handicapped logo

(b) Yellow 33538: centerline, safety boundaries

(c) Blue 15080: handicapped logo background

4. Glass beads: AASHTO Type I beads.

PART 3 – EXECUTION

A. GENERAL

1. Complete all work in each section as indicated by the individual sheet before moving onto the next section. Refer to the Drawings.

B. CONSTRUCTION LIMITATIONS

1. Do not apply when roadway surface or weather conditions would prevent satisfactory construction.

2. Weather Limitations: Do not place when the air temperature is below 55℉ and falling but may be applied when both pavement and air temperatures are above 45℉ and rising.

3. No slurry seal shall be applied when there is danger that the finished product will freeze before 24 hours.

4. Do not place when pavement temperatures exceed 140°F.

5. Do not place when wind velocity exceeds 15 mph.

C. SCHEDULING

1. Prior to moving to next scheduled area of work, contractor to notify COR to confirm work is complete and ready to accept traffic.

D. EQUIPMENT

1. Mixing Equipment

The machine shall be specifically designed and manufactured to lay slurry seal.

The material shall be mixed by a self-propelled, slurry mixing machine of either truck-mounted or continuous-run design.

2. Proportioning Devices

Individual volume or weight controls for proportioning each material to be added to the mix (i.e. aggregate, mineral filler, emulsified asphalt and additive) shall be provided and properly marked.

3. Spreading Equipment

The mixture shall be spread uniformly by means of a conventional surfacing spreader box attached to the mixer and equipped to agitate and spread the material evenly throughout the box. A front seal shall be provided to insure no loss of the mixture at the road contact point. The rear seal shall act as final strike-off and shall be adjustable. The spreader box and rear strikeoff shall be so designed and operated that a uniform consistency is achieved to produce a free flow of material to the rear strike-off. The spreader box shall have suitable means provided to side shift the box to compensate for variations in the pavement geometry. A burlap drag or other approved screed may be attached to the rear of the spreader box to provide a uniform, highly textured mat.

E. REPAIRS

1. Crack and Joint Filling: Remove existing joint filler material from cracks or joints to a depth of 1/4 inch.

a) Clean cracks and joints in existing hot-mix asphalt pavement.

b) Use emulsified-asphalt slurry to seal cracks and joints less than 1/4 inch wide. Fill flush with surface of existing pavement and remove excess.

c) Use hot-applied joint sealant to seal cracks and joints more than 1/4 inch wide. Fill flush with surface of existing pavement and remove excess.

F. EMULSIFIED-ASPHALT SLURRY SEAL

1. Clean surfaces with powered vacuum sweeper and high-pressure water as required to meet conditions. Do not begin applying asphalt until surface is completely dry and has been approved by Engineer.

2. Protect all drains, utilities and manhole covers by covering with building paper prior to spreading asphalt.

3. Provide Traffic Control to prevent “tracking” of asphalt.

4. Rate of application: The slurry seal mixture shall be of proper consistency at all times so as to provide the application rate required by the surface condition.

Suggested application rate shall be 8 -12 lb/sq yd.

5. The slurry seal shall be of the desired consistency upon leaving the mixer. A sufficient amount of material shall be carried in all parts of the spreader at all times so that a complete coverage is obtained. Overloading of the spreader shall be avoided.

6. No lumping, balling, or unmixed aggregate shall be permitted.

7. No streaks, such as those caused by oversized aggregate, shall be left in the finished surface.

G. HANDWORK

1. Areas which cannot be reached with slurry seal machines shall be surfaced using hand squeegees to provide complete and uniform coverage. The area to be handworked shall be lightly dampened prior to mix placement and the slurry worked immediately.

2. Care shall be exercised to leave no unsightly appearance from handwork. The same type of finish as applied by the spreader box shall be required. Handwork shall be completed during the machine applying process.

H. LINES

1. Care shall be taken to measure straight lines along curbs and shoulders. No run-off on these areas will be permitted. Lines at intersections will be kept straight to provide good appearance.

I. ROLLING

1. All parking areas and roadways should be rolled by a self-propelled, 5-ton pneumatic roller with a tire pressure of 50 PSI (3.4 ATMS), equipped with a water spray system. The surfaced areas shall be subjected to a minimum of two

(2) full coverage passes by the roller.

2. Rolling should not commence until the slurry seal has cured enough so that it will not pick up on the tires of the roller.

J. PAVEMENT MARKING

1. Use airless spray-type marking equipment, compatible with waterborne paint, and capable of providing a uniform wet film thickness of 15 ± 2 mils.

2. Prior to application allow slurry seal cure time minimum of 7 days.

3. Pavement surface must be clean and thoroughly dry.

4. Ambient air temperature must be above 50°F.

5. Paint stripes to be uniform and free of erratic waves.

6. Width and location of marking to be designated in the Contract Documents.

7. Apply paint in accordance with the manufacturer's recommendations.

8. Mix paint thoroughly prior to application.

9. Do not thin paint.

10. Apply paint at a rate of not more than 100 square feet/gallon.

11. Apply glass beads during or immediately following the application of paint in such a manner as to provide good adhesion and reflection.

12. Apply glass beads at a rate of 6 pounds/gallon.

13. All pavement marking to conform to the MUTCD.

14. Provide minimum 2 hour dry time before allowing traffic to enter.

K. CLEAN UP

1. The contractor shall remove any debris associated with the performance of the work on a daily basis.

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3. Anti-Strip additive – Product as required to meet the project requirements.

4. Glass beads: AASHTO Type I beads.