Bitumen Testing

Ductility Testing Apparatus 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 end of the bath. A pointer fixed to the carrier moves over a scale graduated fixed on the bath towards the fixed plate side. The rotating shaft has 2 speeds of travel for the bracket, 5cm/min and 1 cm/min., selected by a clutch. Water bath inside is Stainless Steel; it is an insulated water bath. 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.

Accessories :
Ductility mould with base-plate.

Marshall Stability Test Apparatus
The test is applicable to hot mix designs using bitumen and aggregates upto a maximum size of 25mm. In this method, the resistance to plastic deformation of cylindrical specimen of bituminous mixture is measured when the same is loaded at periphery at 5 cm per min. This test procedure is used in designing and evaluating bituminous paving mixes. The test procedure is extensively used in routine test programmer for paving jobs. There are two major features of the Marshall method of designing mix namely,
Density - voids analysis
Stability - flow tests.

The Marshall stability of mix is defined as a maximum load carried by a compacted specimen at a standard test temperature of 60ºC. The flow value is deformation the Marshall test specimen under goes during the loading up to the maximum load, 0.25 mm units. In this test and attempt is made to determine optimum binder content for the type of aggregate mix and traffic intensity.

The apparatus consists of :

• A loading unit motorized, capacity 50KN with two telescopic pillars and an adjustable crosshead. Limit switches are fitted inside to control upward or downward movement of the pillars. On-off reversing switch and indicator lamps are on the front side while a hand wheel to manually move the pillars is on the right. The load frame has fixed speed of 5.08cm per minute. Operated on 230 Volts A.C.
• 1 No. Compaction pedal with specimen mould holder.
• 2 Nos. Compaction Rammers, 4.5kg weight and free fall 45.7cm.
• 1 No. Breaking head assembly with provision to fix flow meter.
• 3 Nos. Specimen mould 10.16cm I.D. x 7.6cm high with base plate and extension collar.
• 1 No. Specimen extraction consists of one each load transfer bar, steel ball, specimen extracting plate.

Pavement Core Drilling Machine Description: -
The Pavement Core drilling machine, diesel engine powered road building drill has been deigned specifically for the purpose of drilling test cores from or holes in roads, airport runways, bridges etc.

The Machine comprises of two vertical support columns, which car the drill head/ engine assembly with the help of screwed spindles.

The 5 hp diesel engine with pulley mechanism works with minimum vibrations. The double precision bit advances with screwed spindle, which provides a constant, accurate drill pressure, minimum core chipping & long bit life. For 100mm dia.x 200mm height or 150mm dia x 300mm height sample.