AS PER IS: 1028 - 1958, ASTM: D 113, IP 32, 55.



  • In flexible pavement construction, bitumen binders are used. It is important that bituminous material forms ductile thin film around the aggregates, which serves as a binder.
  • The binder material not of sufficient ductility renders pervious pavement surface and leads to development of cracks.
  • Therefore it is important to carry out the ductility tests on bituminous material.
  • Ductility is defined as distance in cms to which a standard briquette of bitumen can be stretched before the thread breaks.
  • The briquette is stretched at a rate of 50 mm/minute ±2.5 mm per minute at a temperature of 27°C ± 0.5°C.


General Description & Specifications:

  • The apparatus consists of a Water bath with a thermostatic heater, and a circulating pump to maintain uniform water temperature.
  • One half of the briquette moulds is fixed on a fixed plate in the water bath, the other half of the briquette mould is fixed to a carrier which slides over a rotating threaded shaft with a clutch.
  • The motor and gears to rotate the shaft are housed in a cabinet fixed above the other and of the bath.
  • A pointer fixed to the carrier moves over a scale graduated from 0-110 cm x 1mm fixed on the bath with “0” (zero) of the scale towards the fixed plate slide.
  • The rotating shaft has 2 speeds of travel for the bracket, 5 cm/min. and 1 cm/min, selected by a clutch.
  • Water bath inside is aluminum, it is an insulated water bath. Water bath is provided with a drain.
  • A heater with thermostatic control is fixed inside the water bath. Control switches for motor, stirrer, heater and indicator lamps are fixed at a convenient place on the water bath.
  • Complete with three briquette moulds and one base plate, all made of brass. Operates on 230 Volts A.C. single phase.



  • Thermometer IP 38 C, range 23°C to 27°C
  • Ductility mould with base plate.




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