Which term is used to describe how rocks are blended by size to meet a target gradation?

• A. Skid Resistance
• B. Aggregates
• C. Aggregate Gradation
• D. Location of Plant

Answer: (C)

Aggregate gradation is the term that captures how different sized rocks are blended to achieve a specific size distribution. In practice, engineers define a target gradation curve and use sieve analysis to check the actual mix. If the blend doesn’t match the target, materials from different sources or stockpiles are combined in just the right proportions to adjust the curve until it fits. This focuses on the distribution of particle sizes and the controlled blending process to meet specifications for the mix.

The other options are about different ideas: skid resistance is about pavement friction, aggregates is a broad material category, and location of plant refers to where the material is produced rather than how its size distribution is controlled.