ASTM -3080 2050 User Manual

This latest shear device utilizes a dead weight loading system (straight on and a 10: 1 beam) for applying the vertical load to the sample.
The device is a self-contained stand alone model that is compact and requires little floor space.
A load cell with digital readout is used for measuring shear forces. The vertical and shear displacement are measured with dial indicators.
Optional linear displacement transducer/readouts with analog outputs to data acquisition are available.
The basic device comes complete with 2.5" diameter shear rings and water chamber. Maximum shear displacement is 0.8" from the
home position). Travel is set with limit switches by the operator. A stepping drive motor and controller maintains the desired rate of strain.
The strain rate is easily set with digital thumb wheels and is maintained within 1% by a crystal stabilized clock. The thumb wheel settings
represents direct readings in inches per minute(0001 = .0001"/minute).
CONSTRUCTION
The Direct Shear was designed for harsh lab environments with a solid base (1.25" thick) for the loading and shear box assembly coupled
with a sturdy aluminum cabinet. The upright rods are stainless steel and the cabinet is painted with an enamel finish. The shear rings are
stainless steel and the water chamber is anodized aluminum for corrosion resistance. Cabinet legs are steel angle with floor mounting
holes.
SPECIFICATIONS
MAX VERTICAL
MODEL LOAD
2050 750 lb (340 kg)
Horizontal Movement:
Rate of Strain: 2050
Overall Height:
Cabinet Height:
Length:
Depth:
Weight:
Power:
WEIGHT SET
8 TSF 1/8 1/4
WT SET TSF TSF
1119 2 1
The direct shear test may be run on any type of soil sample, but it is particularly adapted to cohesion materials. This machine can
also be used to establish the undrained shear strength of saturated, highly plastic cohesive soils under certain conditions.
The direct shear test is normally run as a strain controlled test. In order to obtain the effective stress parameters of any soil,
excluding the most pervious medium and fine sands, it is necessary to use a slow rate of shearing in order for induced pore
DEAD WEIGHT
DIRECT/RESIDUAL SHEAR DEVICE
MAX HORIZONTAL
SHEAR FORCE
750 lb (340 kg)
.8" Maximum
.0001" to .2999"/min
54"
9"
36"
14.5"
180 lbs. (without wts.)
110 Volts 60 Hz
½ 1 2
TSF TSF TSF
1 1 1
DEAD WEIGHT DIRECT SHEAR
ASTM-3080
4
TSF
1
See Page 3 for ratios