Which materials require the use of steel balls when performing the test?

The use of steel balls is commonly associated with the determination of the resistance of materials to abrasion and impact, particularly in laboratory testing methods like the Los Angeles Abrasion Test. Steel balls can be incorporated in tests for a wide range of materials to gain insight into their durability and performance characteristics.

Selecting the option that indicates all materials recognizes that many different types of substances can be tested using this method, including metals, concrete, clay, aggregates, and soils. Each of these materials can exhibit different responses to impact and abrasion, and using steel balls helps provide consistent, repeatable testing conditions across various material types. The versatility in using steel balls across all types demonstrates a comprehensive approach to material testing, as the impact resistance and wear characteristics are critical factors in various construction and engineering applications.