Page 57 - HIGHWAY ENGINEERING LABORATORY_FLIP BUILDER

REFERENCE
WORK PROCESS DOCUMENT

1. Fix the sides, clip over the base plate, and tighten the screw of the
clip with the help of a screwdriver.

2. Prepare all the three briquette molds in a similar manner.

3. Pour the melted bitumen in the briquette mold until they are full.

4. Allow the mold to cool at room temperature in air for about 30 to
40 minutes.

5. Place the whole assembly with brass plate and mold in a water
bath, which is maintained at 27 °C for about 30 minutes.

6. Cut the excess bitumen on the surface with the help of hot,
straight-edged putty knife or spatula and level the top surface. The
dimension of the briquette thus formed is exactly 1 sq. cm.

B. Testing of the Specimen:

1. Place the brass plate along with mold containing the specimen
again in the water bath at 27 °C for 85-95 minutes.

2. Remove the briquette from the base plate, unscrew the clips, and
remove the sides of the briquette mold.

3. Attach the assembly of bitumen sample with a base plate with the
help of rings of the clips to the pins or hooks in the ductility
machine. One clip of the mold is attached to the moving part
while the other clip is attached to the fixed part of the ductility

machine.

4. Tighten the screw of the clips of the mold with the help of a
screwdriver.

5. Check the pointer of the ductility machine is at zero. (Or note

down the initial reading of the ductility machine).

6. Switch on the ductility machine and adjust the gear so that the
movable part moves at the speed of 50 mm/minute. (The pull rate
of the machine is to be maintained 50 mm/min).

Higway Engineering Laboratory page 44