Which test method assesses the resistance of aggregates to wear from abrasion?

The Los Angeles machine test is specifically designed to evaluate the resistance of aggregates to wear due to abrasion. In this test, a sample of aggregate is subjected to a specified number of revolutions within a rotating drum that contains steel balls. The aggregates are then tested for the loss of mass, which indicates how well they can withstand friction and impact forces typically found in practical applications like pavements and road surfaces.

The significance of using this test method lies in its ability to predict the long-term performance of aggregates in construction, ensuring that materials will maintain their integrity and support the loads imposed upon them over time. A lower loss indicates a more durable aggregate, making it a critical metric for engineers when selecting materials for various projects.

Other methods mentioned might evaluate different properties of aggregates. For instance, the impact value test assesses the ability of aggregates to resist fracture under impact loads, while the soundness test evaluates the resistance of aggregates to weathering and freezing conditions. The gradation test examines the particle size distribution, which is crucial for determining packing and compaction characteristics. None of these tests specifically focus on abrasion resistance like the Los Angeles machine test does.