Los Angeles Abrasion Test To determine the Los Angeles abrasion value. To find the suitability of aggregates for use in road construction. Select the most suitable aggregate for different kinds of works based on the abrasion value. The test is significant to determine the hardness (and toughness) of the material. The difference between the original and final weights of the sample represents the actual wear. This value is expressed as a percentage of the original weight of the sample and is reported as the percentage of wear.