A-A-50499A
1. Safety. All rotating or reciprocating parts and all parts subject to high
operational temperatures, that are of such a nature or are so located as to be
or become a hazard to the safety of the operating personnel, shall be insulated,
enclosed, or guarded to the extent necessary to eliminate the hazard. The
tamper shall comply with applicable Department of Labor (DoL), Occupational
Safety and Health Administration (OSHA) regulations in effect at time of
manufacture. For noise limitation, the tamper shall comply with OSHA documents.
2. Ease of maintenance. Design" of the tamper shall permit ready accessibility
to all parts for maintenance and repair in the field by use of conventional
general-purpose tools associated with tampers. Replacement and adjustment of
component parts and accessories shall be accomplished with minimum disturbance
to other elements of the tamper. Intricate locking devices, controls, and
threaded fastenings that can be easily over-torqued shall be avoided. Covers or
plates that must be removed for component adjustment or for parts removal shall
be equipped with substantial, quick disconnect fastenings. Accessibility to
lubricating oil fill openings, fluid checking devices, and drain plugs shall be
provided without the need of removing or adjusting accessories and parts.
3. Operational requirements. The tamper shall be capable of operating
satisfactorily in ambient temperatures from O degrees Fahrenheit (°F) up to
125°F.
4. Performance. When operating at maximum frequency and as specified herein,
the tamper shall withstand the strains imposed upon it without receiving any
damage or deformation. The tamper shall be capable of compacting asphalt
concrete between the temperatures of 60°F and 210°F to 92 to 94 percent
compaction (6 to 8 percent air voids). When the asphalt concrete temperature is
between 190°F and 210°F, not more than six passes with the tamper will be
required to achieve the required compaction. When the asphalt concrete
temperature is between 90°F and 190°F, not more than ten passes with the temper
will be required to achieve the required compaction. The water sprinkler will
be used for only the first two passes when material temperature is between 60°F
and 140°F and for all but the final two passes when material temperature is
between 140°F and 210°F. Surface of the compacted asphalt will be smooth,
without any evidence of washboard, rills, dips, depressions, and projections.
The asphalt material, hot and cold mix, and compaction test method shall be in
accordance with the requirements for the location where the performance test iS
conducted (if no local standard is enforceable, use California State Highway
Department SS-1 standards). The tamper shall compact both fine and coarse
grained soils as classified in accordance with ASTM D 2487. Maximum density, as
determined by ASTM D 1557, shall be not less than 90 percent for both soils.
Not more than six passes with the tamper shall be required to compact the fine
grain soil. Not more than ten passes with the tamper shall be required to
compact the coarse grain soil. The tamper shall travel at a maximum forward
speed of not less than 50 feet per minute without any assistance from the
operator except directional control. The tamper in general, and the engine and
vibrating mechanism in particular, shall be designed to protect against the
harmful effects of dust, water, and temperature.
5. Powerplant. The class 1 tamper shall be powered by a four-stroke, air
cooled, gasoline engine, which operates on unleaded fuel. The class 2 tamper
shall be powered by a four-stroke, air cooled, diesel engine. The tamper shall
be powered by the manufacturer's standard commercial engine normally furnished
to the commercial market for that tamper. The power and speed necessary to meet
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