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Softening point denotes the temperature at which the bitumen attains a
particular degree of softening under the specifications of test.
The test is
conducted by using Ring and Ball apparatus.
A brass ring containing test sample
of bitumen is suspended in liquid like water or glycerin at a given
temperature.
A steel ball is placed upon the bitumen sample and the liquid
medium is heated at a rate of 5 C per minute.
Temperature is noted when the
softened bitumen touches the metal plate which is at a specified distance
below.
Generally, higher softening point indicates lower temperature
susceptibility and is preferred in hot climates.
Figure 0.1 shows Softening Point test setup.
Figure 1:
Softening Point Test Setup
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