Precast
Concrete Curbing.
These units may be used in lieu of cast in place
curb. They shall be made and installed in accordance with the
requirements of this item.
Asphalt Concrete Curbing
The specified asphalt concrete
material shall be furnished and placed to form a curb of the required
cross section by one of the following methods or by any other method
approved by the Director.
Method 1. After completion of the surface
course, the area to be occupied by the curb shall be painted or sprayed
with bituminous material meeting the requirements of 407.02 and applied
at the rate of 0.7 L/m2 (0.15 gallons per square yard). Only
the area to be occupied by the curb shall be so treated. The curb shall
then be placed with a hand-operated or self-propelled machine consisting
of a hopper and power-driven screw which forces the material through a
tube by an extrusion method. The proper density and cross section of the
curb shall be obtained by forcing the material through a die attached to
the end of the extrusion tube.
Method 2. The material for the curb shall be
placed as an independent operation preceding the final rolling of the
surface course upon which the curb is to be placed. Loose material of
sufficient height shall be placed and shaped by hand methods using
suitable templates or by other means that will produce the specified
cross section. The loose material shall then be compacted to final cross
section dimensions by use of a hand-operated mechanical vibrating tamper
equipped with a compacting shoe of such shape that will produce the
specified cross section of the curb.
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