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Section 23 – Asphalt Concrete

At the end of the Working Day, the distance between the ends of the adjacent improved

lanes shall be between five feet (5’) and ten feet (10’), unless otherwise approved by the

23-8.02 Pre-Overlay Preparation

Existing asphalt concrete roadways to be overlaid with asphalt concrete shall be prepared

A leveling course may be required. Leveling courses shall be Type "A" asphalt concrete

with three-eighths inch (3/8”) inch maximum aggregate gradation. A leveling course shall be

required for all locations for which the difference in elevation between the existing pavement

surface and the finished pavement surface, as indicated on the Plans, exceeds the thickness of

the overlay designated for the associated areas of roadway by more than 0.02 feet. The total

thickness for asphalt concrete leveling course varies. At locations where the leveling course

thickness exceeds three inches (3”), the leveling course shall be placed in lifts not exceeding

three inches (3”). For projects with pavement reinforcing fabric, leveling course material shall

be placed prior to the placement of the fabric.

The Contractor is responsible for removing all vegetation from the edge of pavement and

sweeping and washing the pavement, if required, in advance of the overlay operation. It is

recommended that a power water wash be used in the deceleration zones of intersections for

the complete removal of dust that may cause overlay slippage.

The Contractor shall remove and dispose of all pavement markers, temporary Type "B"

Detector Handhole protection devices, and temporary traffic stripe (tape), if any, prior to the

overlay. In addition, the Contractor shall remove and dispose of existing traffic bars as required

All thermoplastic limit lines, crosswalks, and legends existing on the road surface shall be

scarified prior to placing the overlay. Scarification shall be performed by grinding such that

approximately twenty percent (20%) of the underlying pavement is exposed. All material

resulting from the grinding operation shall be removed immediately from the right-of-way and

shall become the property of the Contractor and properly disposed of.

Striping removal shall occur no sooner than one Calendar Day prior to the scheduled date

for the placement of asphalt concrete overlay. If the stripe removal is performed on a day other

than the day of the pavement overlay, the Contractor shall supply and install temporary

pavement markings. Temporary pavement markings shall be flush mounted reflectorized tape

squares, 4” x 4” #M “Staymark” with backing liners, detour grade, #6350 yellow and #6351

white, or approved equal. Right turn barrier lines, edge lines, and shoulder lane lines shall not

be delineated with temporary pavement markings. The spacing of the temporary pavement

markings shall be as follows:

Centerline (straight roadway portions)

Centerline (tapered or curving portions)

The Contractor shall be responsible for the removal of the temporary pavement markings

prior to the placement of the overlay.

All manhole and other utility covers encountered in the area to be overlaid with asphalt

concrete shall be carefully referenced out by the Contractor and the locations of the cover

painted on the surface immediately after paving. All storm drain and sewer manhole and