Manual 31 Guidelines for calibrating a binder distributor ... - Aapaq.org

Figure 15: Weighing each 'Bucket'
When the spray does not comply with the limits the nozzles can be
cleaned or replaced and then a further spray carried out. This
procedure is repeated until a successful outcome is achieved.
Appropriate personal protective equipment is to be worn when
performing this test and should include a pair of safety gloves (heat
resistant), face shield and approved overalls.
It is not necessary to clean the troughs between sprays. Diesel or
other suitable fluid can be used to clean the apparatus after the test
is finished and the troughs have cooled down sufficiently.
B.5.6 Fluid for testing and calibration of binder distributors
The testing fluid, at the temperature at which it is to be used, should
have similar flow characteristics to that of bitumen at its optimum
spraying temperature. For annual calibration the default fluid is a
bitumen emulsion heated to 60 o C. Other fluids may be used
including a project specific binder or a testing oil. Testing oil at a
temperature of between 25°C and 30°C should have a dynamic
viscosity of between 0,07 Pa.s and 0,1 Pa.s and a density of 0,85
kg/L to 0,94 kg/L.
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