The Deep Freezers are widely used in medical laboratories and for industrial purposes to store chemicals, bloods, tissue cultures, and other medical samples that can only be stored and preserved in low temperature range. 

 

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 0 0 of 50mm/minute +/-2.5 mm per minute at a temperature of 27 C+/-0.5 C.

 

Specification:

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 in 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, 5cm/min. and 1cm/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 mould and one base plate, all made of brass. Operates on 230Volts A.C. single phase.

  

 

It is used for determining Striping Value of bituminous mixes having aggregate size 1.0mm to 75 microns.

 

Specification:

A circular tray rotates in a vertical plane at a rate of approximately 100 rpm by an electrical 0 geared motor1 4 bottles of approximately 400cc are mounted on this circular tray at an angle of 90 to each other with their mouth towards centre of the tray. A time switch is provided. Suitable for operation on 230Volts A.C. Single phase.

 

This device was developed by U.S. Bureau of Public roads and is used to measure deflections of flexible pavements.

The light weight instrument is supplied in two path for assembling on site with easy hand tools. In use one end of the beam rests at a point under investigation while the beam is pivoted at the centre.

The free and carries a dial gauge to record the deflections.

The other end is kept on a stable platform.

The beam ratio is 2:1 which magnifies even small deflections.

Supplied with a dial gauge 0.01 to 25mm.

This is a lift weight dismantle able instrument and easy carry.