Softening Point Test of Bitumen

    • 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



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