6.1
Refer to the relevant standard for full details of the Marshall test procedure.
6.2
A typical set up for carrying out a Marshall test is shown in figure 4.
Important: the Stability piston and Stabilising bar should be used as shown in
figure 4 and the breaking head must be placed in the machine with the long
guide post facing the operator as shown in figure 5 to ensure very safe loading
conditions.
6.3
To fit the Stability piston, remove the ball nipple from the load ring (or load
transducer) and replace it with the adaptor supplied with the Stability piston. Fit the
ball nipple removed from the load ring (or load transducer) onto the Stability piston
and then screw the Stability piston onto the adaptor on the load ring (or load
transducer). Ensure that all connections are fully tightened.
6.4
Before commencing tests it is necessary to set the height of the crosshead to obtain
the optimum clearance between the ball nipple and the load stud on the Breaking
head. See figure 5.
6.5
Ensure that the Stabilising bar is in position before commencing the test. It is
important to set the Stabilising bar at a height that will not impede the raising of the
platen and Breaking head.
6.6
Operate the machine so that the platen travels to its lowest position.
With the Breaking head on the platen, fit the calibration disc. See figure 5
Important: do not under any circumstances load the machine with the
calibration disc in position.
6.7
Position the crosshead to give the clearance shown in figure 5.
To ensure that the
crosshead is level, the alignment studs on the lower nuts should be located centrally
and at the front of the machine. Tighten the locking nuts using a spanner.
column
column
load stud
breaking head
rear of machine
platen
long guide post
front of machine
view from above showing position
of breaking head on the platen
5 mm minimum
long
guide
post
load stud
ball nipple
view showing clearance between
ball nipple and load stud
Figure 5
calibration disc
breaking head
Original Instructions
13
Summary of Contents for TT AUT-MARSHALL-CBR
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