Asphalt Repair Specification

REPAIRING ASPHALTIC CONCRETE PAVEMENTS

PART 1 GENERAL

SECTION INCLUDES

A. Patch pavement areas detailed on drawing to full-depth with hot mix, hot laid asphaltic concrete.

REFERENCES

A. Appropriate state specification for hot mix, hot laid asphalt for the job site area.

B. CL-19 The Asphalt Institute Bulletin, "Full-Depth Asphalt Patching"

C. ASTM D 946 Standard Specification for Penetration Graded Asphalt Cement in Pavement Construction

D. ASTM D 2397 Standard Specification for Cationic Emulsified Asphalt

E. ASTM D 3381 Standard Specification for Viscosity-Graded Asphalt Cement for use in Pavement Construction

F. ASTM D 3628 Standard Practice for Selection and Use of Emulsified Asphalt

PROJECT/SITE CONDITIONS

A. ENVIRONMENTAL REQUIREMENTS

1. Apply hot mix, hot laid asphaltic concrete in dry weather when pavement and atmospheric temperatures are [ forty (40) degrees ] [ ] F. or above and are anticipated to remain above [ forty (40) degrees ] for four (4) hours after completing application.

PART 2 PRODUCTS

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IDENTIFY PRODUCT TYPE AND QUALITY IN MATERIALS LISTED BELOW AS APPROPRIATE FOR AVAILABLE LOCAL MATERIALS.

DO NOT REQUIRE TESTING OR OTHER QUALITY DETERMINATIONS UNLESS THERE IS SPECIFIC INTENTION TO ENFORCE THE REQUIREMENT.

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MATERIALS

A. Asphalt Cement: [ ASTM D 3381 ] [ ASTM D 946 ]

In accordance with [ State ] [ Municipality ]] of [ ] [ Highways ] [ Public Works ] standards.

B. Mineral Aggregate: [ In accordance with; [ [ State ] [ Municipality ]] of [ ] [ Highways ] [ Public Works ] standards. ]

C. Tack Coat: [ ASTM D 2397 ] [ D 3628 ]

MIXES

A. Use dry material to avoid foaming. Mix uniformly in central plant.

B. Mixture: [ 5 to 7 ] [ ] percent of asphalt cement by weight in total mixture in accordance with;

[ ] [ [ State ] [ Municipality ] of [ ] [ Highways ] [ Public Works ] standards. ]

PART 3 EXECUTION

3.01 EXAMINATION

A. Inspect areas that have not been detailed for patching on drawing number [ ] and notify Architect/Engineer if additional patching is needed.

B. If after excavating for patching, the subbase is found to be unsuitable, notify Architect/Engineer.

PREPARATION

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ARCHITECT/ENGINEER TO DEFINE ACCEPTABLE PROCEDURES FOR DENSITIES AND TESTING IF NOT DEFINED ELSEWHERE.

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A. Remove surface, base course and subgrade to reach firm support. Extend at least one (1) foot horizontally into pavement.

B. Make square or rectangular cuts. Make faces straight and vertical, with one pair of faces, where practical, parallel to the direction of traffic.

C. Trim and compact subgrade. Compact subgrade to at least one hundred (100) percent of standard procter density or ninety-five (95) percent of modified procter density.

D. Tack coat vertical surfaces with ASTM D 2397 or D 3628 asphalt emulsion types SS-1, SS-1h, CSS-1 or CSS-1h diluted with equal parts of water.

REPAIR/RESTORATION

A. Backfill with hot mix, hot laid asphaltic concrete while temperature stays above one hundred eighty five (185) degrees F. Prevent segregation of mixture.

B. Compact in layers, if hole is more that four (4) inches deep. Compact layers thoroughly to maximum of three (3) inches in thickness. Compact with equipment most suited for size of job.

C. Adequate compaction equipment will yield surface of patch at same elevation as the surrounding pavement. When hand tamping or other light compaction methods are required, leave surface of compacted patch slightly higher than adjacent pavement, permitting patch to be further compressed by traffic.

D. Check riding quality and alignment of patch with a straight edge or string line.

CLEANING

A. Broom clean areas of work and remove extra materials from job site.

ATTACHED SCHEDULES

END

These specifications are provided for informational purposes only. NPCA assumes no liability for their completeness, accuracy, or suitability for a particular purpose.