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LONGITUDINAL COMPRESSOMETER AZA1172
The AZA1172 Longitudinal Compressometer is a precision mechanical instrument designed for measuring axial (longitudinal) deformation of concrete cylinders subjected to compressive loading. Manufactured in full compliance with ASTM C469, it is an essential tool for determining the modulus of elasticity and supporting calculations of Poisson’s ratio in hardened concrete.
This instrument is widely used in construction material testing laboratories, civil engineering research facilities, academic institutions, and quality control departments, where accurate stress–strain characterization of concrete is required.
Purpose & Function
During compression testing, concrete undergoes axial shortening. Accurate measurement of this deformation is critical for plotting the stress–strain curve and calculating elastic properties. The AZA1172 compressometer measures these minute changes in length with high precision, ensuring reliable and repeatable results.
When used alongside a compression testing machine—and optionally with a lateral extensometer—the AZA1172 enables full elastic behavior analysis in accordance with ASTM C469 procedures.
Description
Design & Construction
The compressometer features a lightweight yet rigid aluminum alloy frame, engineered to maintain dimensional stability under repeated loading cycles. The unit is mounted directly onto the specimen using quick-fit clamping rings or threaded studs, allowing fast installation and consistent positioning.
A high-precision mechanical dial gauge (standard) measures axial deformation over a fixed gauge length, typically set between 200 mm and 250 mm. The gauge offers excellent readability and stability, ensuring accurate tracking of deformation throughout the loading cycle. Digital or LVDT-based variants are available upon request.
The system is adjustable to accommodate 100 mm and 150 mm diameter concrete cylinders, generally of 300 mm height, making it suitable for standard laboratory testing practices.
Applications
-
Modulus of elasticity testing of concrete
-
Stress–strain behavior analysis
-
Poisson’s ratio determination (with lateral extensometer)
-
Quality control of concrete mix designs
-
Civil engineering research and academic instruction
-
Compliance testing as per ASTM standards
Specifications
| Feature | Description |
|---|---|
| Model | AZA1172 – Longitudinal Compressometer |
| Standard | ASTM C469 |
| Specimen Sizes | 100 mm & 150 mm diameter, 300 mm height |
| Gauge Length | 200 mm – 250 mm (adjustable) |
| Measurement Accuracy | ±0.002 mm (mechanical dial gauge) |
| Gauge Type | Mechanical dial (Digital / LVDT optional) |
| Frame Material | Aluminum alloy (Stainless steel optional) |
| Installation Type | Clamping rings or threaded studs |
| Weight | Approx. 2–3 kg |
| Application | Concrete axial strain measurement |
| Accessories | Carry case, calibration block, clamping rings |
Frequently Asked Questions (FAQ)
Q1: What is the primary use of a longitudinal compressometer?
It measures axial strain in concrete cylinders during compression testing to determine the modulus of elasticity as per ASTM C469.
Q2: Which specimen sizes are supported?
The instrument is adjustable for 100 mm and 150 mm diameter concrete cylinders.
Q3: How accurate are the readings?
The standard mechanical dial gauge provides accuracy up to ±0.002 mm.
Q4: Is calibration required?
Yes. Calibration using a standard block or micrometer is recommended before each test series.
Q5: Is this suitable for educational laboratories?
Yes. Its straightforward setup, visible operation, and repeatability make it ideal for academic and training environments.
Additional information
| Model |
Longitudinal Compressometer |
|---|---|
| Standard |
ASTM C469 |
| Specimen Sizes |
100 mm & 150 mm diameter, 300 mm height |
| Gauge Length |
200 mm to 250 mm (adjustable) |
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