Ductility Test of Bitumen

    • Ductility is the property of bitumen that permits it to undergo great deformation or elongation.
    • Ductility is defined as “The distance in cm, to which a standard sample of the material will be elongated without breaking”.

  • Dimension of the briquette thus formed is exactly 1 cm square. The bitumen sample is heated and poured in the mould assembly placed on a plate. These samples with moulds are cooled in the air and then in water bath at 27 °C temperature.
  • The excess bitumen is cut and the surface is leveled using a hot knife.
  • Then the mould with assembly containing sample is kept in water bath of the ductility machine for about 90 minutes.
  • The sides of the moulds are removed, the clips are hooked on the machine and the machine is operated.
  • The distance up to the point of breaking of thread is the ductility value which is reported in cm.
  • The ductility value gets affected by factors such as pouring temperature, test temperature, rate of pulling etc. A minimum ductility value of 75 cm has been specified by the IS

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