Softening point test
The softening point test is conducted by the Ring and Ball method in the laboratory.
The test sample of
the given bituminous material is put in the brass ring which is then suspended
in liquid like water or Glycerin at a given temperature. After this, a steel
ball is placed upon the bitumen and the liquid is heated at a rate of 5°C per
minute. The temperature at which the softened bitumen touches the metal base
placed at a specified distance below the ring is recorded as the softening
point of the bitumen. The softening distance below the ring is recorded as the
softening point of the bitumen. The softening points so recorded are compared
with the specified values and thus the suitability of the bitumen under test is
decided for bituminous pavement construction.
The softening point
of various bitumen grades used in bituminous pavement construction jobs vary
between 35°C to 70°C.
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