Bituminous surfaces are exposed to different temperature conditions and endure a considerable deal of expansion and contraction. A crucial feature of the binder is its ductility and the degree of ductility has an effect on the cracking of bituminous surfaces caused by traffic stress.
The ductility of bitumen is expressed as the distance in centimeters to which a basic briquette can be elongated before the thread formed breaks under stated conditions. A molten bitumen sample is poured into a standard mold, allowed to cool to room temperature, and then put into a water bath so that the briquette can be brought to test temperature prior to mounting in the testing machine.
Engineered to test three specimens concurrently, the machine has a carriage moving over a lead screw. An electric motor driven reduction gear unit guarantees smooth constant speed and continuous operation. The whole assembly is mounted with water bath totally encased in metal bound hardwood. It is fitted with an electric pump circulator and heater. The temperature is regulated by a digital temperature controller. Two rates of travel - 5 cm/minimum and 1 cm/minimum – are provided. The machine is supplied whole with four ductility molds, each comprising a base plate.
Supplied as Standard
- TO-56501 3 x ductility molds
- TO-560501 3 x ductility molds