3.2
APPLICATION OF FIRST COURSE
3.2.1
Bituminous Material
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NOTE: Application temperatures will vary with the
grade of asphalt or tar used. Recommended materials
and application temperatures may be found in
paragraph APPLICATION TEMPERATURE OF MATERIALS,
below and in Asphalt Institute Publications: Asphalt
Surface Treatments - Specifications (publication No.
ES-11) and Asphalt Surface Treatments - Construction
Techniques (publication No. ES-12).
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Bituminous material shall be applied by means of a bituminous distributor
at the temperature specified in paragraph APPLICATION TEMPERATURE OF
MATERIALS,below or as directed. The bituminous material shall be applied
within the limits specified in paragraph QUANTITY LIMITS in PART 1.
Bituminous material shall be applied in such a manner that uniform
distribution is obtained over all surfaces treated. Unless the distributor
is equipped to obtain a satisfactory result at the junction of previous and
subsequent applications, building paper shall be spread on the surface for
a sufficient distance back from the ends of each application so that flow
through the sprays may be started and stopped on the paper in order that
all sprays will operate at full force on the surface treated. Immediately
after application, the building paper shall be removed and destroyed.
Areas inaccessible to the distributor shall be properly treated with
bituminous material using the hose attachment. Protect adjacent buildings,
structures, and trees to prevent their being spattered or marred.
3.2.2
Spreading of Aggregate
Immediately following application of bituminous material, aggregate shall
be spread uniformly over the surface within the limits of the quantities
specified in paragraph QUANTITY LIMITS in PART 1. Spreading shall be done
with mechanical spreaders. Aggregate shall be spread evenly by hand on all
areas missed by the mechanical spreader. Equipment spreading aggregate
shall be operated backwards, so that the bituminous material will be
covered ahead of the truck wheels. When hand spreading is employed on
inaccessible areas, aggregate shall be spread directly from trucks.
Additional aggregate shall be spread by hand over areas having insufficient
cover, and spreading shall continue during these operations when necessary.
3.2.3
Brooming and Rolling
The surface shall be rolled with a pneumatic-tired and a steel-wheeled
roller after sufficient aggregate is spread. Rolling shall continue until
no more aggregate can be worked into the treated surface. The use of the
steel-wheeled roller will be discontinued, or a lighter weight steel wheel
roller substituted, as directed, if the roller being used causes excessive
crushing and shattering of the aggregate. If the aggregate is not
distributed properly, the surface shall be broomed as soon as possible
after the first coverage by the roller, but not until the surface has set
sufficiently to prevent excessive marking. Brooming, rolling, and
supplemental spreading of aggregate shall continue until the surface is
cured and rolled sufficiently to key and set the aggregate. In places not
accessible to rollers, the aggregate shall be compacted with pneumatic
tampers. Aggregate that becomes contaminated with foreign matter shall be
SECTION 02745
Page 14
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