LABORATORY VANE SHEAR APPARATUS (MOTORISED) AZA0920 - Image 1
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POCKET VANE SHEAR APPARATUS AZA0921
POCKET VANE SHEAR APPARATUS AZA0921

LABORATORY VANE SHEAR APPARATUS (MOTORISED) AZA0920

The AZA0920 Motorised Laboratory Vane Shear Apparatus from Azalab is a high-precision instrument designed for accurate determination of undrained shear strength (cᵤ) and sensitivity of cohesive soils such as clays and silts. The motorised drive ensures a constant and uniform rate of vane rotation, eliminating operator-induced variability and delivering highly repeatable, standard-compliant results.

This apparatus is an essential tool for geotechnical laboratories, research institutions, and civil engineering projects, particularly where reliable strength parameters of soft to medium cohesive soils are required for foundation, slope, and embankment design

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Description

Description

Principle of Operation

The laboratory vane shear test is a direct shear method performed on undisturbed or remoulded soil samples under controlled conditions:

  1. A cruciform vane of standard dimensions is carefully inserted into the soil specimen.

  2. The motorised drive applies torque at a constant prescribed rate.

  3. The torque required to cause shear failure of the soil is measured using a calibrated torsion spring system.

  4. The peak torque value is converted into undrained shear strength (cᵤ) using standard equations based on vane geometry.

  5. After remoulding the soil by rapid rotation, a second test determines remoulded strength.

  6. Soil sensitivity is calculated as the ratio of undisturbed to remoulded shear strength.

Applications

The AZA0920 is widely used for:

  • Determination of undrained shear strength of cohesive soils

  • Sensitivity evaluation of clays

  • Foundation and embankment design studies

  • Stability analysis of slopes and earth structures

  • Academic research and soil mechanics laboratories

  • Quality control in geotechnical investigations

Key Features and Advantages

  • Motorised rotation for constant and standard-compliant shear rate

  • High accuracy and repeatability compared to manual systems

  • Calibrated torsion spring torque measurement

  • Multiple interchangeable springs for different soil strength ranges

  • Adjustable vane head for precise insertion with minimal disturbance

  • Supplied with standard cruciform vanes

  • Robust laboratory-grade construction

  • Optional digital torque readout available

  • Supplied in a sturdy wooden carrying case

Standards Compliance

  • IS 2720 (Part 30): 1980 (Reaffirmed 2021) – Laboratory Vane Shear Test

  • ASTM D4648 / D4648M – Laboratory Miniature Vane Shear Test

  • BS 1377 – Part 7 – Shear Strength Tests

Specifications

Parameter Specification
Model AZA0920
Product Type Laboratory Vane Shear Apparatus
Operation Motorised
Power Supply 230 V AC, Single Phase
Rotation Rate Constant rate, typically 1/60 RPM (as per standards)
Torque Measurement Calibrated torsion spring system
Springs Supplied Set of 4 calibrated springs (various torque ranges)
Readout Graduated dial with peak value pointer
Vane Head Height adjustable via lead screw
Vane Blades Standard cruciform vanes (multiple sizes supplied)
Sample Container Suitable for prepared samples / sampling tubes
Construction Heavy-duty steel
Accessories Included Springs set, vane set, sample container, calibration chart, wooden carrying case
Standards IS 2720 (Part 30), ASTM D4648, BS 1377-7
Country of Origin Made in India

Frequently Asked Questions (FAQ)

Q1: What does the AZA0920 measure?
It measures the undrained shear strength and sensitivity of cohesive soils in laboratory conditions.

Q2: Why is motorised operation important?
A constant rotation rate is mandatory for accurate vane shear testing. Motorised operation ensures compliance with standards and eliminates operator variability.

Q3: Which soils can be tested?
Soft to medium cohesive soils such as saturated clays and silts. It is not suitable for sands or gravels.

Q4: Can both undisturbed and remoulded samples be tested?
Yes. The apparatus supports both, enabling sensitivity determination.

Q5: What vane sizes are provided?
A set of standard cruciform vanes of different dimensions is supplied to suit various soil strengths and standards.

Additional information

Additional information

Model

AZA 0920
Product Type

Laboratory Vane Shear Apparatus
Operation

Motorized (Electrically operated)
Power Supply

230 V A.C., Single Phase
Rotation Rate

Constant rate of rotation, typically 1/60 R.P.M. (or 0.1 degrees per second) as per standards.
Vane Head Assembly

Adjustable height via lead screw and drive wheel for precise lowering of vane.

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