Created: 2025/06/30 01:41
Experiment No.: 04
Name of Experiment: Determination of Aggregate Impact Value
Method: BS 812 (Part 3) 1975
Objectives of the Test:
- To determine the Aggregate Impact Value (AIV) of a given aggregate sample.
- To assess the toughness of aggregates under sudden impact or shock.
- To evaluate the suitability of aggregates for use in road and pavement constructions.
Significance of the Test:
- The impact value indicates the aggregate's resistance to sudden load.
- Ensures the selected aggregates will perform well under traffic loads and vibrations.
- Helps in quality control and selection of materials for base and surface layers.
Apparatus Used:
- Aggregate Impact Test machine
- Cylindrical metal container
- Cylinder steel cup
- Metal tamping rod
- Balance
- 2.36 mm Sieve
Datasheet:
Test Result:
The Average Aggregate Impact Value (AIV) of the given sample was determined to be 14%.
Discussion:
The Aggregate Impact Value (AIV) for the tested sample was found to be 14%. This relatively lower (than the standard limit of 30%) value indicates that the aggregates have high toughness and can resist sudden impacts effectively. Hence, aggregates with such an AIV are considered suitable for use in road bases, surface layers, and other areas where they may be subjected to traffic loads, vibrations, or shock forces.
While the AIV does not directly measure long-term durability, it provides a strong indication of the material's ability to withstand dynamic loading conditions. In this case, the result being well within the acceptable limit of 30% confirms that the aggregate is appropriate for use in high-stress environments.
The assumed conditions for the test seem to have been satisfied. The sample size was consistent (14 mm passing and 10 mm retained), the sample was dry and uniformly tamped, and sieving was done through the 2.36 mm sieve as required. Careful attention was given to weight measurement and test procedure.
Potential errors in this experiment could arise from incomplete sieving, inaccurate weighing, or uneven compaction of the sample. Human error in impact loading or improper cleaning of the sieve may also affect the results. Still, when performed carefully, the AIV test is considered reliable and repeatable.