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Section 23 – Asphalt Concrete

monitoring well box adjustments are the responsibility of the Contractor. Adjustment to grade of

other utility covers will be by others.

The Contractor is responsible for furnishing and placing an asphalt emulsion tack coat in

advance of the overlay as provided in Sections 37, 39, and 94 of the State Specifications.

All mixtures shall be spread at a temperature of not less than 260°F.

23-8.03.A Hand Spreading

Areas inaccessible to spreading and compaction equipment may be paved by such methods

as approved by the Agency. In limited areas where irregularities or unavoidable obstacles make

the use of mechanical spreading and finishing equipment impracticable, the asphalt concrete

mixture may be spread, raked, and luted by hand tools. The mixture shall be thoroughly

compacted by means of pneumatic tampers or other methods that will produce the required

compacted thickness.

When hand spreading is permitted, the mixture shall be dumped either on the grade or on

dump sheets outside the area upon which it is to be spread, and then distributed into place

using hot shovels, and spread with hot rakes in a uniformly loose layer to the full width required,

and at a depth that, when the Work is completed, will have the required thickness and will

conform to the grade and surface tolerance specified.

Whenever hand spreading or backwork is required behind the paving spread, the paving

machine shall be stopped until such hand spreading or backwork is completed.

23-8.03.B Mechanical Spreading Equipment

In addition to the requirements in Section 39-5.01, “Spreading Equipment”, of the State

Specifications, asphalt equipment shall be equipped with automatic screed controls and a

sensing device or devices. A twelve-foot (12’) long straightedge shall be required on all paving

Asphalt pavers shall be self-propelled mechanical spreading and finishing equipment,

provided with a screed or strike-off assembly capable of distributing the material to not less than

twelve feet (12’) in width. Screed actions shall include any cutting, crowding, or other practical

action which is effective on the mixture without tearing, shoving, or gouging, and which

produces a surface texture of uniform appearance. The screed shall be adjustable to the

required section and thickness. Pavers shall not leave ridges, indentations, or other marks that

cannot be eliminated by rolling or prevented by adjustment of operation.

The paver shall have a receiving hopper of sufficient capacity to permit a uniform spreading

operation. The hopper shall be equipped with distributing screws to place the mixture uniformly

in front of the screed.

The screed shall be equipped with a controlled heating device for use when required. The

screed shall strike off the mix to the depth and cross-section specified.

The material being placed in the abutting lanes shall be tightly crowded against the face of

the previously placed lane. The paving machine shall be positioned to overlap the existing mat

only to the extent that the material placed against the joint is tightly crowded against the vertical

face at the joint and that the conform raking leaves no ridges or depressions. Before

compacting or pinching the joint, the coarse aggregate in the overlapped material that has

dislodged through raking shall be removed from the pavement surface and discarded.

When placing asphalt concrete to lines and grades established by the Agency, the

automatic controls shall control the longitudinal grade. Grade and slope references shall be

furnished, installed, and maintained by the Contractor. Should the Contractor elect to use a ski

device, or if it is required by the Special Provisions, the minimum length of the ski device shall

be twenty-eight feet (28’). The ski device shall be a rigid one-piece unit and the entire length

shall be utilized in activating the sensor.