The Aggregate Impact Value Apparatus (AIV) calculates aggregate impact value by measuring an aggregate's resistance to sudden impact or shock loading, which can differ from its resistance to gradually applied compressive loads on construction materials like crushed stones and gravel. It is calculated by submitting a sample of aggregate to a standard amount of impact, often in a testing machine, and then measuring the percentage of fines created.

A high Aggregate impact value (AIV) implies a weak aggregate, which is more likely to fracture under impact stress. This test is often used in the construction industry to determine the appropriateness of aggregates for use in pavement construction, where impact resistance is required. The test simulates the impact of vehicle loads and evaluates the aggregate's capacity to withstand rapid shocks and stress.

This device is built with a sturdy solid steel frame and a mechanical blow counter.