Which tests are needed for the item classified as Aggregate Base Course?

The classification of an Aggregate Base Course (ABC) involves several tests to ensure that the material meets engineering requirements, particularly in terms of its strength, durability, and suitability for supporting structures such as roads and pavements. Among the most relevant tests for this purpose are the California Bearing Ratio (CBR), abrasion resistance, and Grading, Plasticity, and Compaction Density (GPCD).

The CBR test is critical as it assesses the strength of the material when subjected to loads, which is vital for estimating how well the aggregate can support overlying structures. The abrasion test evaluates the wear resistance of the aggregate, which is important for durability and longevity, especially under traffic loads. The GPCD tests analyze the grading and compaction characteristics—the material's ability to achieve proper density when compacted enhances performance and stability.

The other options may include tests relevant to other materials or applications, but they do not encompass the essential aspects of testing necessary for ensuring the quality and performance characteristics specifically associated with Aggregate Base Course materials. Thus, the combination of CBR, abrasion, and GPCD provides a comprehensive assessment suited to the performance requirements of this type of material.