Identify a common test used to evaluate the durability of coarse aggregates.

The Sodium Sulfate Soundness Test is a widely recognized method for assessing the durability of coarse aggregates, particularly in relation to their resistance to weathering and environmental effects. This test involves subjecting aggregates to cycles of wetting and drying in a sodium sulfate solution, which simulates the conditions that aggregates might experience in the field. The primary focus of the test is to observe how well the aggregates can withstand these cycles without significant degradation or loss of mass, which is crucial for ensuring the longevity and performance of the aggregate in construction applications.

This method is particularly important for identifying aggregates that might deteriorate when exposed to moisture and freeze-thaw cycles, which can lead to structural issues in finished concrete or pavement structures. The results help in selecting suitable materials for various applications, making it an essential test for maintaining the integrity and durability of construction materials.

In contrast, the other tests mentioned have different objectives: the California Bearing Ratio Test primarily evaluates subgrade strength, the Los Angeles Abrasion Test measures resistance to mechanical wear, and the Proctor Density Test assesses compaction characteristics of soils and aggregates. While all these tests have their importance, they do not specifically focus on the durability of coarse aggregates in the same manner as the Sodium Sulfate Soundness Test