The los angeles test is a measure of degradation of mineral aggregates of standard gradings resulting from a combination of actions including abrasion or attrition, Impact, And grinding in a rotating steel drum containing a specified number of steel spheres. The los angeles l. A. Abrasion test is a common test method used to indicate aggregate toughness and abrasion characteristics. Aggregate abrasion characteristics are important because the constituent aggregate in hma must degradation and, Resist crushing disintegration for the purpose of produce an exceptional standard hma. Apparatus steel spherical balls machine This device is loaded with a counter. The machine shall consist of hollow steel cylinder closed on either side an opening in cylinder shall be provided for introducing the sample sievesaggregate used in highway pavement should be hard and must resist wear as a result of the loading from compaction equipment, The polishing effect of traffic and the internal abrasion effect. The road aggregate should be hard enough to resist the abrasion of aggregate. Resistance to abrasion is determined in laboratory by loss angles abrasion test