Article 1 — Description
Repair localized sections of flexible pavement structure, including subgrade, base, and surfacing, as shown on the plans.
Article 2 — Materials
Furnish materials unless otherwise shown on the plans. Provide materials of the type and grade as shown on the plans and in accordance with the following. Item 132, “Embankment” Item 204, “Sprinkling” Item 247, “Flexible Base” Item 260, “Lime Treatment (Road -Mixed)” Item 275, “Cement Treatment (Road- Mixed)” Item 276, “Cement Treatment (Plant -Mixed)” Item 292, “Asphalt Treatment (Plant -Mixed)” Item 310, “Prime Coat” Item 316, “Seal Coat” Item 330, “Limestone Rock Asphalt Pavement” Item 334, “Hot -Mix Cold -Laid Asphalt Concrete Pavement” Item 341, “Dense- Graded Hot -Mix Asphalt” Item 34 4, “Superpave Mixtures” For asphalt concrete materials, Contractor testing and payment adjustment provisions will be waived unless otherwise shown on the plans.
Article 3 — Equipment
Furnish equipment in accordance with pertinent Items. Use of a motor grader will be permitted for asphalt concrete pavement unless otherwise shown on the plans.
Article 4 — Work Methods
Repair using one or more of the following operations as shown on the plans. For Contracts with callout work, begin physical repair within 24 hr. of notification unless otherwise shown on the plans. Cut neat vertical faces around the perimeter of the work area when removing pavement structure layers. Removed materials are the property of the Contractor unless otherwise shown on the plans. Dispose of removed material in conformance with federal, state, and local regulations. Provide a smooth line and grade conforming to the adjacent pavement.
4.1 Removing Pavement Structure. Remove adjacent soil and vegetation if necessary to prevent contamination of the repair area and place it in a windrow. Do not damage adjacent pavement structure during repair operations. Remove flexible pavement structure layers from work area if subgrade work is required.
435 4.2. Preparing Subgrade . Fill holes, ruts, and depressions using a pproved material. Wet, reshape, and compact the subgrade thoroughly as directed. Remove unstable subgrade material to the depth directed and replace with an approved material where subgrade has failed.
4.3 Mixing and Placing Base Material . Place, spread, and compact material in conformance with the applicable
Item to the required or directed depth. Pulverize bituminous material to a maximum dimension of 2- 1/2 in., and uniformly mix with existing base to the depth shown on the plans when the material is to remai n in pavement structure.
4.3.1 Flexible Base. Use existing base and add new flexible base as required in accordance with Item 247 and
details shown on the plans to achieve required section.
4.3.2 Lime -Stabilized Base. Use existing base, add new flexible base, and stabilize with a minimum lime content
of 3% by weight of the total mixture. Construct in accordance with Item 260 and details shown on the plans to achieve required section.
4.3.3 Cement -Stabilized Base. Use existing base, add flexible base, and stabilize with a minimum cement
content of 4% by weight of the total mixture. Construct in accordance with Item 275 or Item 276 and details shown on the plans to achieve required section.
4.3.4 Asphalt -Stabilized Base. Place asphalt -stabilized base in accordance with Item 292 or Item 341 and details
shown on the plans to achieve required section.
4.3.5 Limestone Rock Asphalt. Place in accordance with Item 330 and details shown on the plans to achieve
required section.
4.4 Curing Base . Cure in conformance with the appropriate Item unless otherwise directed or approved.
Maintain completed base sections until surfacing.
4.5 Surfacing . Apply surfacing to the completed base section using materials shown on the plans.
4.5.1 Prime Coat . Protect the compacted, finished, and cured flexible, lime-stabilized, or c ement -stabilized base
mixtures with a prime coat of the type and grade shown on the plans. Apply the prime coat at the rate shown on the plans.
4.5.2 Surface Treatments. Apply surface treatment with the type and grade of asphalt and aggregate as shown on the plans in accordance with Item 316.
4.5.3 Asphalt Concrete Pavement . Apply tack coat of the type and grade and at the rate shown on the plans
unless otherwise directed. Construct in accordance with Item 330, Item 334, Item 341, or Item 344 to achieve required section.
4.6 Finishing. Regrade and compact disturbed topsoil. Clean roadway surface after repair operations.
4.7 Ride Quality. Use Surface Test Type A to determine the ride quality of the repaired areas, unless otherwise shown on the plans.
Article 5 — Measurement
This Item will be measured by the square yard. In areas where material is excavated, as directed, to depths greater than those specified on the plans, measurement will be made by dividing the actual depth of such area by the plan depth and then multiplying this figure by the area in square yard of work performed. Calculations for each repaired area will be rounded up to the nearest 1/10 sq. yd. At each repair location, the minimum area for payment purposes will be 1 sq. yd. 436 The minimum quantity for Contrac ts with callout work is 5 sq. yd. per callout unless otherwise shown on the plans.
Article 6 — Payment
The work performed and materials furnished in accordance with this Item and measured as provided under “Measurement” will be paid for at the unit price bid for “Flexible Pavement Structure Repair” of the specified depth. This price is full compensation for scarifying, removing, hauling, spreading, disposing of, and stockpiling existing pavement structure; removing objectionable or unstable material; furnishing and placing materials; maintaining completed section before surfacing; applying tack or prime coat; hauling, sprinkling, spreading, and compacting; and equipment, labor, tools, and incidentals.