Page 52 - HIGHWAY ENGINEERING LABORATORY_FLIP BUILDER

REFERENCE
WORK PROCESS DOCUMENT

For Cutback Bitumen:

1. Heat the material to a temperature 17 lower than the expected
flash point. Bring the tester to the same temperature too.

2. Fill the space between the cup and the interior of the air bath with
the same temperature to remove the air.

3. The same procedure as above is followed then after. Except for
the rate of the application of heat. Control the rate of the
application of heat such that the temperature increases by 1-1.5

°C per minute as recorded from the thermometer.
4. Turn the stirrer at the rate of 70-80 rev/min.

5. Then the test flame is applied and the other steps are followed as

described previously except for the interval at which test flame is
applied. Instead of applying test flame at intervals of 1 °C, the test
flame is applied at every 0.5 °C rise in temperature.

DATA :

NAME GROUP
CHECKED BY DATE

Observation:
As the test flame is applied, at a certain temperature, a flash
can be observed. This temperature is noted down as flash
point.
Again, the test flame is continued to be applied. At a certain
temperature, the fire occurs for at least 5 seconds. This temperature
is noted down as fire point.

Observation Table:

(A sample observation table for flash and fire point test is drawn
below)

Higway Engineering Laboratory page 39