What parameter does the "Los Angeles Abrasion" test measure?

The "Los Angeles Abrasion" test is specifically designed to measure the toughness of aggregates, which is a critical property in assessing their durability for use in concrete and asphalt mixtures. This test evaluates the resistance of aggregates to wear and degradation when subjected to abrasion and impact. Essentially, it involves placing a certain amount of aggregate in a rotating drum along with steel balls, where the friction and impact from the balls and the drum's surface lead to the wear of the aggregate.

The results from this test provide a percentage of weight loss of the aggregates, indicating how brittle or tough the materials are. Tough aggregates contribute to the longevity and performance of pavement as they can withstand traffic loads and environmental conditions without breaking down. This property is particularly important in highway construction, as it directly relates to the longevity of the pavement and its ability to manage wear over time.