In the flexiblepavement construction where bitumen binders are used. It is of significantimportance that the binders form ductile thin film around the aggregates. Thisserves as a satisfactory binder in improving the physical interlocking of theaggregates. The binder material which does not possess significant ductilitywould crack and thus provide previous pavement surface. The ductility isexpressed as the distance in centimeters to which a standard briquette ofbitumen can be stretched before the thread breaks.
The instrument isdesigned as per IS:1208 and consist the following:
Three nos. of mouldsmounted on a base plate, each mould has two end clips, two slides with knurledscrews and side support for proper assembly on the base plate. One spare mouldwith base plate for casting the specimen also supplied
One Water bath ofapprox. 10-liter volume with a perforated shelf, provided with athermostatically controlled heater.
The machine has tworates of travel i.e. 5cm/min and 1 cm/min. A clutch arrangement is provided bywhich the movement of the moveable bracket can be arrested or restarted withoutswitching the motor off. Suitable to work on 220V ~, 50Hz.
Accessories and spares: