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Aggregate Impact Value (AIV) Test
Accurate Aggregate Impact Value Testing for Stronger and Safer Infrastructure
The Aggregate Impact Value (AIV) Test is a standard laboratory procedure used to determine the toughness of coarse aggregates by measuring their resistance to sudden impact or shock. Since aggregates make up approximately 60–75% of the volume of concrete and asphalt mixes, their mechanical properties significantly influence the strength, durability, and long-term performance of construction projects.
The AIV Test is particularly important for aggregates used in roads, highways, airport pavements, bridges, railway ballast, and concrete structures, where materials are subjected to repeated impact loads from traffic and heavy machinery.
At QC LAB Solution Bangladesh, we provide advanced Aggregate Impact Value testing equipment that delivers accurate, reliable, and standards-compliant results for construction companies, quality control laboratories, universities, consultants, and government organizations.
What is the Aggregate Impact Value (AIV) Test?
The Aggregate Impact Value Test measures the percentage of fines produced when a standard sample of aggregate is subjected to a specified number of blows from a standard hammer under controlled conditions.
The percentage of crushed material passing a 2.36 mm sieve after impact is reported as the Aggregate Impact Value (AIV).
- Lower AIV = Higher aggregate toughness and better impact resistance.
- Higher AIV = Weaker aggregate that is more susceptible to impact damage.
This test helps engineers select aggregates suitable for various construction applications.
Importance of the Aggregate Impact Value Test
The AIV Test is essential because it:
- Evaluates the toughness of coarse aggregates.
- Determines resistance to sudden impact and shock.
- Helps select suitable aggregates for pavement construction.
- Supports quality assurance (QA) and quality control (QC).
- Ensures compliance with project specifications.
- Reduces the risk of aggregate degradation under traffic loads.
- Improves the durability of concrete and asphalt structures.
- Supports safe and cost-effective infrastructure development.
Principle of the Test
A prepared aggregate sample is placed in a cylindrical mould and subjected to 15 standard blows from a 13.5–14.0 kg hammer falling from a height of 380 mm. After testing, the sample is sieved through a 2.36 mm sieve, and the percentage of fines generated is calculated.
The Aggregate Impact Value (AIV) is calculated using the formula:
AIV (%) = (Weight of material passing 2.36 mm sieve ÷ Total weight of sample) × 100
Equipment Required
The test requires the following equipment:
- Aggregate Impact Value Apparatus
- Cylindrical Measure
- Tamping Rod
- Standard Hammer
- Impact Testing Machine
- 2.36 mm IS Sieve
- Balance (0.1 g accuracy)
- Oven
- Drying Tray
- Sample Containers
Modern testing equipment ensures precise and repeatable results in accordance with international standards.
Test Procedure
The Aggregate Impact Value Test generally follows these steps:
1. Sample Preparation
Select clean, oven-dried aggregate of the specified size fraction.
2. Filling the Measure
Fill the cylindrical measure in three layers, compacting each layer with the standard tamping rod.
3. Transfer to the Test Cup
Place the compacted sample into the impact testing cup.
4. Impact Loading
Apply 15 standard blows using the falling hammer.
5. Sieving
Sieve the tested sample through a 2.36 mm sieve.
6. Calculation
Determine the weight of material passing the sieve and calculate the Aggregate Impact Value as a percentage.
Common Testing Standards
Aggregate Impact Value Testing is performed according to internationally recognized standards, including:
- BS 812 Part 112
- IS 2386 (Part IV)
- EN 1097-2 (related aggregate mechanical property testing)
- Applicable national highway authority specifications
Following these standards ensures consistent, accurate, and internationally accepted test results.
Interpretation of Results
General guidelines for AIV values are:
| Aggregate Impact Value | Quality Assessment |
|---|---|
| Less than 10% | Exceptionally strong |
| 10–20% | Very strong |
| 20–30% | Strong and suitable for heavy-duty pavements |
| 30–35% | Suitable for normal concrete and road works |
| Above 35% | Weak aggregate; generally not recommended for heavy-duty pavement applications |
Acceptance limits may vary depending on the applicable project specifications and standards.
Applications
The Aggregate Impact Value Test is widely used in:
- Highway construction
- Airport runway projects
- Bridge construction
- Concrete production
- Asphalt pavement construction
- Railway infrastructure
- Aggregate quarries
- Material testing laboratories
- Universities and research institutes
- Government quality control agencies
Benefits of Aggregate Impact Value Testing
Accurate AIV testing provides:
- Better aggregate selection
- Improved pavement durability
- Higher-quality concrete production
- Compliance with international standards
- Reduced maintenance costs
- Enhanced structural safety
- Improved quality control
- Greater confidence in construction materials
Why Choose QC LAB Solution Bangladesh?
QC LAB Solution Bangladesh is a leading supplier of civil engineering and construction material testing equipment. We provide comprehensive laboratory solutions for testing aggregates, concrete, cement, soil, asphalt, steel, and other construction materials.
Our Advantages
- High-quality Aggregate Impact Value Apparatus
- Equipment compliant with BS, IS, ASTM, and EN standards
- Professional installation and commissioning
- Calibration and maintenance support
- Technical training
- Reliable after-sales service
- Competitive pricing
- Fast delivery throughout Bangladesh
- Expert technical consultation
Our mission is to help laboratories and construction professionals achieve precise, efficient, and standards-compliant testing.
Conclusion
The Aggregate Impact Value (AIV) Test is an essential laboratory test for evaluating the toughness and impact resistance of coarse aggregates used in construction. By identifying aggregates that can withstand repeated impact loads, the test helps ensure the durability, safety, and long-term performance of roads, pavements, bridges, and concrete structures.
With advanced Aggregate Impact Value Testing Equipment and expert support from QC LAB Solution Bangladesh, laboratories and construction professionals can perform accurate, repeatable, and internationally compliant aggregate testing with confidence.
Frequently Asked Questions (FAQs)
1. What is the Aggregate Impact Value Test?
The AIV Test measures the toughness of coarse aggregates by determining their resistance to sudden impact or shock.
2. Why is the AIV Test important?
It helps engineers select durable aggregates for roads, pavements, bridges, and concrete structures while ensuring compliance with quality standards.
3. What does a low Aggregate Impact Value indicate?
A low AIV indicates that the aggregate has high toughness and excellent resistance to impact.
4. Which standards are commonly used for the AIV Test?
The most common standards are BS 812 Part 112 and IS 2386 (Part IV).
5. Which industries use Aggregate Impact Value Testing?
It is widely used in highway construction, aggregate production, concrete manufacturing, infrastructure projects, research laboratories, and quality control facilities.