AZA 0906 VOLUME CHANGE GAUGE

Description

The Volume Change Gauge is a precision device used for determining the volume change in saturated soil specimens during triaxial shear and permeability testing. It is an essential part of a complete triaxial test system, designed to provide accurate data on the inflow or outflow of water from a sample, enabling calculation of volumetric strain and effective stress analysis.

This apparatus is especially critical in Consolidated Undrained (CU) and Consolidated Drained (CD) triaxial tests, where monitoring the change in volume due to compression and pore pressure variations is fundamental to understanding soil behavior.

The Volume Change Gauge connects in-line with the drainage or back pressure circuit of the triaxial setup and records water movement through a graduated burette or piston assembly. Its high-resolution readings ensure even the smallest volume fluctuations are captured reliably during testing.

Applications

The volume change gauge is commonly used in:

• CU and CD triaxial shear tests

• Soil consolidation and swelling studies

• Permeability testing in cohesive soils

• Volumetric strain analysis under controlled drainage

• Academic, research, and construction soil labs

By measuring the volume of water entering or leaving a soil sample, this apparatus allows researchers and engineers to determine critical soil parameters like bulk modulus, coefficient of permeability, and volume compressibility.

Construction & Features

This lab-grade instrument features:

• Borosilicate glass or acrylic burette (typically 50–100 ml)

• Calibrated scale for direct volume readings (±0.1 ml resolution)

• Plunger or piston system with low-friction linear movement

• LVDT or dial indicator to measure displacement (optional digital)

• Drain and back-pressure connection ports

• Heavy-duty metal frame with mounting bracket

The burette is housed securely to prevent vibration or tilt during the test, and the entire assembly is pressure-tight to avoid leakage or air entrapment. Optional upgrades include digital volume transducers for automated data logging.

Standards and Compliance

This gauge is designed in accordance with:

• ASTM D4767 – Standard for CU Triaxial Compression Test

• BS 1377 Part 7 – British Standards for Effective Stress Tests

• IS 2720 (Part 11, 12) – Indian Standard for Triaxial and Consolidation Tests

You can view the ASTM D4767 Standard for detailed testing protocol.

Key Benefits

• High-precision volume change measurement

• Compatible with manual or digital triaxial systems

• Robust design ensures long life and repeated accuracy

• Supports critical stress-path and pore pressure studies

• Easy-to-read scale with optional digital output

Specifications:

FREQUENTLY ASKED QUESTIONS (FAQ):

Q1: What is a Volume Change Gauge used for?
A1: It measures the change in volume (typically water displacement) in saturated soil specimens during triaxial or permeability testing.

Q2: Can it be connected to digital systems?
A2: Yes, many models offer LVDT or digital displacement gauge options for real-time data logging.

Q3: Is this suitable for both CU and CD triaxial tests?
A3: Absolutely. It is ideal for any test requiring precise volume change measurement under controlled drainage conditions.

Q4: How accurate is the gauge?
A4: It typically offers a resolution of 0.1 to 0.2 ml, depending on the scale or displacement sensor used.

Q5: Does it include mounting accessories?
A5: Yes, the system includes a stable stand or mounting frame for secure placement during testing.