Page 46 - HIGHWAY ENGINEERING LABORATORY_FLIP BUILDER

5.0 DATA

NAME GROUP
CHECKED BY DATE

Test Ball 1 Ball 2
Number
The temperature at
which each bitumen
specimen touches the
base plate
( C)
0

The Mean Temperature (Softening Point) :

6.0 RESULTS

The mean temperature of the two specimens (which shall not differ by more than as
shown as Table 1) is recorded as the softening point.

Table 1: Maximum Difference for the Mean Temperature of the Two Specimens

TEMPERATURE DIFFERENCE
30°C below 30°C - 80°C 2°C
80°C above 1°C
2°C

This temperature is to be used in conjunction with the penetration value to obtain the
Penetration Index (PI). (Figure 5.3: Nomograph for Penetration Index of Bitumen) . Asphalt
cement with PI between –1 to +1 is suitable to be used in asphalt paving works.

Figure of sample of bitumen finally touches the base plate

Higway Engineering Laboratory page 33