Spring type unconfined compression testing apparatus can be used either in a laboratory or in field. This apparatus is as per the design of Building Research Station, U. K. Unconfined Compression Test Apparatus (Spring Type - Autographic)

Salient Features

• Specifications : Consists of a spring operated load frame with arrangements for loading 38 mm x 76 mm samples, one set of four load springs of stiffness 0.2 kg, 0.4 kg, 0.8 kg, and 1.6 kg/mm, a calibrated mask and one set of 50 charts, in a metal carrying case.
  Spares & Accessories : Charts, set of 50 Calibrated mask. Spring set comprising one each of stiffness 2 N/mm, 4N/mm, 8N/mm and 16 N/mm Coning toll for 38 mm sample (female) Coning toll for 38 mm sample (male) Tripod stand wooden, for using the instrument in field.

This is a hand operated instrument for determining the unconfined compression strength of soil specimens of diameter ranging from 38 mm to 100 mm. Load on the sample is applied gradually by a hand operated load frame and loads are measured on a sensitive proving ring attached to the load frame. Unconfined Compression Tester Proving Ring Type (Hand Operated).
Salient Features

• Specifications: Comprises of a hand operated load frame, cap. 5000 kgf with screw jack for loading, handle and strain dial gauge bracket, adaptor for proving ring, conical seats and male/female coning tools for 38 mm dia samples. Supplied without proving ring, dial gauge.

This is similar to above with the added advantage of a motorised drive permitting a choice of three constant rates of stain. Specifications: comprises a screw operated load frame cap 5000 kg. with a gear box and motor drive giving 1.25, 1.5, 2.5 mm/min. rates of strain, a pair of cone seating, adaptor for proving ring and stain dial gauge bracket. Supplied with one pair of male/female coning tools for 38 mm dia samples but without proving ring and dial gauge. Suitable for operation on 230 volts, single phase A. C. Supply.
Salient Features

• Accessories: Coning tools in pairs (male & female) for samples having diameter 38 mm, 50 mm, 75 mm & 100 mm.
• - Also available with only one rate of train 1.25 mm/min.
• - Also available with the following rates of strains: 1.5mm/min, 2.0 mm/min and 3.0 mm/min.

Capacity 50 kg. Specimen size 38 mm dia x 76 mm long. strain measurement is done on a scale fixed to one of the pillars. Scale graduated mm. Complete with conical seatings, a male coning tool and one proving ring 50 kg. cap with chart, specimen 40 mm dia x 80 mm long can also be tested.