C 300 degrees F during storage and shall not be heated by the application
of a direct flame to the walls of storage tanks or transfer lines. Storage
tanks, transfer lines, and weigh buckets shall be thoroughly cleaned before
a different type or grade of bitumen is introduced into the system.
1.5
PLANT, EQUIPMENT, MACHINES, AND TOOLS
The bituminous plant shall have capacity to produce the quantities of PFC
mixture required. Hauling equipment, paving machines, rollers,
miscellaneous equipment, and tools shall be provided in sufficient numbers
and capacity, and in proper working condition, to ensure proper placement
of the PFC mixtures at a rate that will permit proper construction of the
PFC. A sufficient number of trained personnel shall be available during
paving operations to ensure production of a PFC pavement that meets the
requirements of this specification.
1.5.1
Mixing Plants
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NOTE: The capacity shall be the minimum required to
produce the required tonnage within the specified
time limits and in no case should the capacity be
less than 100 metric tons (tons) per hour.
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The mixing plant shall be a commercially manufactured unit, automatically
or semiautomatically controlled, designed, and operated to consistently
produce a mixture meeting the requirements of the job mix formula (JMF).
The plant shall have a minimum capacity of [_____] metric tons tons per
hour. Coarse aggregate, fine aggregate and natural sand (when used) shall
be stored in and dispensed from separate cold storage bins. When drum
mixers are used, they shall be prequalified at the production rate to be
used during actual mix production. The prequalification tests will include
extraction and recovery of the asphalt cement in accordance with ASTM D 2172
and ASTM D 1856. The penetration of the recovered asphalt binder shall
not be less than 60 percent of the penetration of the original asphalt, as
measured in accordance with ASTM D 5.
1.5.2
Straightedge
The Contractor shall furnish and maintain at the site, in good condition,
one 3.7 m (12 foot) 12 foot straightedge for each bituminous paver, for use
in the testing of the finished surface. Straightedge shall be made
available for government use. Straightedges shall be constructed of
aluminum or other lightweight metal and shall have blades of box or
box-girder cross section with flat bottom reinforced to ensure rigidity and
accuracy. Straightedges shall have handles to facilitate movement on
pavement.
1.6
ACCESS TO PLANT AND EQUIPMENT
The Contracting Officer shall be provided access at all times to all parts
of the paving plant for checking adequacy of any equipment in use;
inspecting operation of the plant; verifying weights, proportions, and
characters of materials; and checking temperatures maintained in
preparation of the mixtures.
SECTION 02747
Page 8
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