What is the primary purpose of the Los Angeles abrasion test?

The primary purpose of the Los Angeles abrasion test is to determine the resistance of aggregates to crushing and degradation, particularly under conditions of wear and impact. This test measures the durability and strength of aggregates when subjected to mechanical forces, simulating conditions they may encounter in real-world applications, such as road construction or concrete production. By determining how much a sample of aggregate is reduced in size after being subjected to this test, engineers can assess the quality and suitability of the materials for use in various construction projects.

While the other options relate to important properties of materials, they do not align with the specific intent of the Los Angeles abrasion test. Evaluating moisture retention pertains to a different aspect of aggregate characteristics, measuring resilience focuses on how well materials bounce back from deformation rather than their ability to withstand crushing forces, and testing soil shear strength involves analyzing the structural integrity of soil rather than aggregate materials. Thus, the Los Angeles abrasion test is specifically designed to provide insights into the crushing resistance of aggregates, making it essential for informed selection and usage in construction.