JMT - 105
DUCTILITY TESTING APPARATUS IS : 1028 - 1958, ASTM : D113, 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 of sufficient ductility renders previous pavement surface and leads to development of cracks. Therefore it is important to carry out the ductility tests on betumenus material. Ductility is defined as distance in cms to which a standard briquette to bitumen can be stretched before the thread breaks. The briquette is stretched at a rate of 50mm/minute +/-2.5 mm per minute at a temprature of 27 degree celsius +/-0.5 degree celsius.
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 palate in the water bath, the other half of the briquette mould is fixed to a carrier which slides over a rotating thread shaft with a clutch. The motor or gears to rotate the shaft are housed in a cabinet fixed above the other end of the bath. A pointer fixed to the carrier moves over a scale graduated to 0 - 110cm 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 1cm/min.,
selected by a clutch. Water bath is provided with a drain. A heater with thermostatic control is fixed inside the water bath. Control switches for motor, stirrer, heater indicator lamps are fixed at a convenient place on the water bath, Completer with the three briquette moulds and one base plate, all made of brass. operates on 230 volts A.C., single phase.
1.Thermometer IP 38 c, range 23 degree celsius to 27 degree celsius 2. Ductility mould with base plate.