Page 58 - HIGHWAY ENGINEERING LABORATORY_FLIP BUILDER
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REFERENCE
WORK PROCESS DOCUMENT
7. Thus, the two clips are pulled apart horizontally at uniform speed
until the briquette specimen ruptures.
8. Measure the distance between the clips at the time of rupture of
the specimen
Observation:
As the ductility machine is allowed to run, one end of the machine
remains fixed, while the other end is pulled apart. The distance at
which the thread of the bitumen breaks is to be noted down for all the
three samples. If the specimen does not break even at 75 centimeters,
the machine is stopped and the ductility value is then mentioned as
greater than 75 cm.
DATA :
Description Sample- 1 Sample- 1 Sample- 1
Initial Reading (a) in mm
Final Reading (b) in mm
Ductility (b-a) in mm
Ductility of the sample = Average value of ductility of 1, 2, 3.
The ductility test of bitumen specimen is dependent on the grade
of the bitumen. Hence, ductility requirements vary with the grade
of the bitumen. Minimum ductility values standardized by Bureau
of Indian Standard for Bitumen Type1 for different grades are
tabulated below:
Grade of Bitumen Type-I Ductility (in cm)
S – 35 50
S – 55 75
S – 65 75
S – 90 75
S – 200 75
Higway Engineering Laboratory page 45
