Category: unconfined

Introduction

Geotest manufactures a variety of compression machines suitable for performing this test. More machines can be found in the triaxial section. All unconfined compression machines can be equipped to measure axial stress with a double proving ring or a load cell with digital display. Load cell models offer extreme accuracy as readout displays to 0.1 lbf or 1N and includes a peak hold feature. All Geotest unconfined compression apparatus conform to ASTM D2166; AASHTO T208.

MULTI-LOADERS are also routinely used for unconfined testing.See related items S5830, S5830A, and S5831.

Unconfined Compression Apparatus
ASTM D2166; AASHTO T208

On hand operated versions load is applied to the specimen by turning an aluminum hand crank connected to a gear box that drives the lower platen. Total platen movement is 3" (76.2mm). Rate of strain is regulated by speed of rotation of the hand crank (50 turns equal approximately 0.125" or 3.2mm). Size is 15x8x33" (381x203x838mm).

Motorized unconfined compression devices will perform all standard tests requiring an adjustable rate of 1 to 10% strain on samples from 1 to 3" (25.4 to 76.2cm) in diameter. As on all Geotest manufactured compression machines, they are vibration free with precise, repeatable strain rate control from 0.005 to 0.315 inch (0.12 to 8mm) per minute. Speeds are maintained constant within 2% despite variation in load or small voltage changes. Circuitry is all solid state, full wave SCR control with feed back regulation. Controls include graduated speed dial, line fuse, motor fuse, fwd/brake/rev switch with dynamic braking, on-off switch and pilot light. Size is 15x10x33" (381x254x838mm). Standard electrical requirements are 115VAC; for 230VAC, add “-3” to catalog number.

Platens are 3" in diameter and have concentric rings to aid in centering sample. Platen height is 10" (254mm). Width between columns is 7.75" (197mm). Apparatus includes 2 plastic discs that can be used as spacers when positioning sample.

Most unconfined tests are performed on 6" high samples. If a 2" or 50mm travel dial indicator is needed, please advise so that we can quote a price.

Following are the catalog numbers available. Modifications can be made to fit exact needs.

Hand Operated Unconfined Compression Testers

Cat.No. w/proving ring	Capacity (approx. sens.) w/prov.ring		Cat.No. w/load cell	Capacity (Sensitivity) w/load cell
S2000	1500 (0.5) lbf		S2002	2,000 (0.1) lbf
S2001	500 (0.1) lbf			or 10kN (1N)

Hand operated-Shipping Weight: 35 lb (16 kg); 3 cu.ft.

We can convert most hand unconfined compression testers to automatic data acquisition in the field with a lap top PC.

Economy Motorized Unconfined Apparatus

Cat. No. w/proving ring	Capacity (approx.sens.) w/prov.ring		Cat.No w/load cell	Capacity (Sensitivity) w/load cell
S2010	1500 (0.5) lbf		S2008	2,000 (0.1) lbf
S2011	500 (0.1) lbf			or 10kN (1N)

Motorized-Shipping Weight: 65 lb (30kg); 5 cu. ft.

S2000.11 Spare Plastic Disks for all Unconfined

Items in the category: unconfined