weight equivalent to a Caterpillar D-6. For restricted placement
areas, such as placement of RCC near the dam crest or next to
abutments, the dozer shall have as a minimum a size and weight
equivalent to a Caterpillar D-4.
c. There shall be a minimum of one operating dozer for each 150 cubic
meters 200 cubic yards of RCC placed each hour. The dozers shall be
equipped with well maintained grousers. A front-end loader with
operator shall be available to assist with deposition and spreading of
RCC as needed in confined areas.
d. The equipment shall be maintained in good operating condition.
The
equipment shall not leak or drip oil, grease, or other visible
contaminants onto the RCC surface.
e. All equipment used for spreading and remixing that leaves the
surface of the structure for maintenance or repairs or, for any other
reason, must be cleaned of all contaminants by an approved method
before returning to the structure surface. Under no conditions shall a
dozer or other tracked vehicle be operated on other than fresh
uncompacted RCC except to facilitate startup operations for each lift
and by approved procedures.
3.1.7
Compaction Equipment
The compaction equipment shall conform to the following requirements.
3.1.7.1
Primary Rollers
Self-propelled vibratory rollers shall be used for primary rolling and
shall be double-drum. They shall transmit a dynamic impact to the surface
through a smooth steel drum by means of revolving weights, eccentric
shafts, or other equivalent methods. The compactor shall have a minimum
gross mass of 9000 kg 20,000 pounds and shall produce a minimum dynamic
force of 60 000 N/m 350 pounds per linear inch of drum width. The
operating frequency shall be variable in the approximate range of 1,700 to
3,000 cycles per minute. The amplitude shall be adjustable between 0.4 and
1.0 mm 0.015 and 0.04 inches. The roller shall be capable of full
compaction in both forward and reverse directions. The roller shall be
operated at speeds not exceeding 0.7 m/s 2.2 ft/s. Within the range of the
operating capability of the equipment, the Contracting Officer may direct
or approve variations to the frequency, amplitude, and speed of operation
which result in the specified density at the fastest production rate.
3.1.7.2
Small Vibratory Rollers
Small vibratory rollers shall be used to compact the RCC where the larger
vibratory rollers specified above cannot maneuver. The rollers shall
compact the RCC to the required density and shall be so demonstrated during
construction of the test section. Small vibratory rollers cannot compact
the RCC to the same density and thickness as the primary rollers;
therefore, when small rollers are used, total lift thickness of the RCC
layer or lift shall be reduced to not over 150 mm 6 inches uncompacted
thickness to permit adequate compaction. Rollers shall have independent
speed and vibration controls and shall be capable of a wide range of speed
adjustments.
SECTION 03701
Page 41
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