1.12.5.3
Longitudinal Mechanical Float
A longitudinal mechanical float shall be specially designed and
manufactured to smooth and finish the pavement surface without working
excess paste to the surface. It shall be rigidly attached to the rear of
the paver-finisher or to a separate self-propelled frame spanning the
paving lane. The float plate shall be at least 1.5 m 5 feet long by 200 mm
8 inches wide and shall automatically be oscillated in the longitudinal
direction while slowly moving from edge to edge of the paving lane, with
the float plate in contact with the surface at all times.
1.12.5.4
Nonrotating Pipe Float
A pipe float if used, shall be a nonrotating pipe 150 to 250 mm 6 to 10
inches in diameter and sufficiently long to span the full paving width when
oriented at an angle of approximately 60 degrees with the centerline. The
pipe float shall be mounted on a self-propelled frame that spans the paving
lane. No means of applying water to the surface shall be incorporated in
the pipe float.
1.12.5.5
Other Types of Finishing Equipment
Clary screeds, other rotating tube floats, or bridge deck finishers shall
not be allowed on mainline paving, but may be allowed on irregular or
odd-shaped slabs, and near buildings or trench drains, subject to the
Contracting Officer's approval. Bridge deck finishers shall have a minimum
operating weight of 3400 kg 7500 pounds and shall have a transversely
operating carriage containing a knock-down auger and a minimum of two
immersion vibrators. Vibrating screeds or pans shall be used only for
isolated slabs where hand finishing is permitted as specified, and only
where specifically approved. Concrete finishing equipment of types other
than specified above may be demonstrated on a test section outside the
production pavement if approved in writing.
1.12.6
Curing Equipment
Equipment for applying membrane-forming curing compound shall be mounted on
a self-propelled frame that spans the paving lane. The reservoir for
curing compound shall be constantly mechanically (not air) agitated during
operation and shall contain means for completely draining the reservoir.
The spraying system shall consist of a mechanically powered pump which will
maintain constant pressure during operation, an operable pressure gauge,
and either a series of spray nozzles evenly spaced across the lane to give
uniformly overlapping coverage or a single spray nozzle which is mounted on
a carriage which automatically traverses the lane width at a speed
correlated with the forward movement of the overall frame. All spray
nozzles shall be protected with wind screens. Calibrate the spraying
system in accordance with ASTM D 2995, Method A, for the rate of
application required in paragraph: Membrane Curing. Any hand-operated
sprayers allowed by paragraph: Membrane Curing shall be compressed air
supplied by a mechanical air compressor. If the curing equipment fails to
apply an even coating of compound at the specified rate, it shall
immediately be replaced.
1.12.7
Texturing Equipment
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NOTE: Edit the following paragraphs to correlate
with the drawings and with paragraph Texturing. Do
SECTION 02753
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