DUCTILITY TESTING APPARATUS AZA0956

Description

Principle of Operation

The AZA0956 operates on the principle of controlled tensile elongation. A bituminous sample is first molded into a standard briquette shape using ductility molds. After conditioning at the specified test temperature—typically 25 °C—the specimen is mounted between two clips inside a temperature-controlled water bath.

One clip remains stationary while the other is pulled away at a uniform, controlled speed using a motor-driven carriage moving over a precision lead screw. As the specimen elongates under tensile stress, it continues to stretch until rupture. The total distance stretched at the moment of break is recorded as the ductility value.

The apparatus is capable of testing three specimens simultaneously, significantly improving laboratory productivity without compromising accuracy.

Design and Construction Features

The AZA0956 Ductility Testing Apparatus is designed for precision, durability, and continuous laboratory use:

• Stainless-Steel Lined Water Bath
  Ensures corrosion resistance, easy cleaning, and uniform temperature distribution.

• Thermostatically Controlled Heating System
  Maintains the test temperature accurately, typically at 25 °C, as required by international standards.

• Electric Circulating Pump
  Ensures constant water circulation for uniform temperature throughout the bath.

• Motorized Pulling Mechanism
  A reduction gear-driven electric motor provides smooth, vibration-free movement of the carriage.

• Lead Screw & Carriage Assembly
  Ensures precise and uniform elongation of specimens at controlled speeds.

• Multiple Test Capability
  Designed to test three briquette specimens simultaneously for improved efficiency.

• Metal-Bound Hardwood Outer Casing
  Provides structural rigidity, durability, and thermal insulation.

Importance in Pavement Engineering

The AZA0956 plays a critical role in bitumen quality assessment and pavement performance evaluation:

Binder Quality Assessment

Determines the elasticity and tensile resistance of bitumen, helping identify materials prone to cracking.

Pavement Durability Prediction

Higher ductility values generally indicate better resistance to thermal cracking and fatigue under traffic loads.

Quality Control & Compliance

Ensures that bituminous materials conform to project specifications and regulatory standards before use in road construction.

Research & Development

Used extensively in R&D laboratories for evaluating modified binders, polymer-modified bitumen (PMB), and new asphalt formulations.

Ductility testing is a mandatory requirement in many specifications referenced by MoRTH, IRC, and international standards organizations.

Key Features & Benefits

• Simultaneous testing of three specimens

• Accurate and stable temperature control

• Uniform and consistent rate of elongation

• Two selectable rates of travel: 50 mm/min and 10 mm/min

• Robust construction for long service life

• Fully compliant with Indian and international standards

Technical Specifications

Model Number: AZA0956
Test Type: Ductility Test for Bituminous Materials

Temperature Range:

• Typically maintained at 25 °C (other temperatures possible as per standards)

Elongation Speed:

• 50 mm/min (standard)

• 10 mm/min (optional)

Measurement Range:

• 0–100 cm × 1 mm least count

Specimen Capacity:

• Three specimens tested simultaneously

Water Bath:

• Stainless steel construction

• Integrated heater and circulating pump

Drive Mechanism:

• Electric motor with reduction gear and lead screw

Power Supply:

• 230 V AC, 50 Hz, Single Phase

Standards Compliance:

• IS 1208 / IS 1208-1058

• ASTM D113

• IP 32 / IP 55

• AASHTO T51

Standard Accessories Included:

• Ductility mould with base plate – 3 Nos.

• Thermometer IP 38 °C (Range: 23 °C to 27 °C)

Operating Procedure (Summary)

1. Prepare bitumen briquettes using standard ductility molds.

2. Condition specimens in the water bath at the specified temperature.

3. Mount specimens in the clips inside the bath.

4. Set the elongation speed (50 mm/min or 10 mm/min).

5. Start the motor and observe elongation until specimen rupture.

6. Record the elongation length as the ductility value.

Routine maintenance includes cleaning the bath, checking water circulation, and periodic verification of temperature and travel speed.

Frequently Asked Questions (FAQ)

Q1. What does the AZA0956 measure?
It measures the ductility of bituminous materials, defined as the distance a specimen can stretch before breaking under controlled conditions.

Q2. Why is ductility important in asphalt testing?
Ductility indicates the flexibility and tensile strength of bitumen, helping predict its resistance to cracking under temperature changes and traffic loading.

Q3. How does the AZA0956 ensure accurate results?
By maintaining constant temperature with a circulating water bath and applying a uniform, motor-controlled rate of elongation.

Q4. Can multiple samples be tested at the same time?
Yes. The AZA0956 is designed to test three specimens simultaneously.

Q5. Which standards does this apparatus comply with?
It complies with IS 1208, ASTM D113, IP 32 / 55, and AASHTO T51.

Q6. Who typically uses the AZA0956?
Civil engineering laboratories, highway authorities, asphalt producers, QC departments, and research institutions.

Summary

• Measures ductility of bituminous materials accurately

• Essential for evaluating pavement flexibility and durability

• Motorized, temperature-controlled, and highly reliable

• Fully compliant with international and Indian standards

• Ideal for quality control, mix design, and research applications