INTRODUCTION
The engineering properties of an asphalt mix relate directly to the
compaction method. Thus, the method of specimen compaction is
crucial to creating asphalt specimens that behave like asphalt used in
construction and in obtaining meaningful test results. Studies show
that gyratory compacted asphalt specimens possess engineering
properties similar to those achieved under actual paving conditions.
The Model 4140 Gyratory Compactor (Figure 1-1) meets or exceeds
all Federal Highway Administration (FHWA) SUPERPAVE™
specifications. The unit provides safe, reliable gyratory compaction
of asphalt specimens at a given consolidation pressure and angle of
gyration. The Model 4140 provides significant improvements over
other gyratory compactors in user safety, machine durability, noise
levels, heat output, and energy consumption.
For user safety, all rotating parts are covered and cannot be
physically accessed during compaction. The gyratory compactor
will not compact a specimen with either the shrouds improperly
positioned or the specimen chamber door open. The red
〈EMERGENCY〉 safety button found in the lower right corner of
the control unit stops all moving parts and releases all forces that
could pose a threat to the user.
Two access doors, one on the front and one on the left side of the
compactor, provide easy access for angle verification and
adjustment. The shrouds allow access to the rotating parts and
machine control electronics for maintenance.
The Model 4140 requires little maintenance. To reduce the effects
of gyration on moving parts, the gyratory compactor requires some
lubrication. If necessary, the user may easily replace the turntable
insert. For a schedule of machine maintenance see page A-8.
To offer more flexible laboratory use, the Model 4140 provides two
compaction modes: automatic and manual. The automatic
compaction mode compacts the asphalt specimen with the touch of
a single key. The manual compaction mode allows the user to
control each phase of specimen compaction.
To Next Page
Loading...
Need help?
General
