How does temperature affect the performance characteristics of aggregates?

Temperature plays a significant role in the performance characteristics of aggregates, particularly influencing moisture content and compaction behavior. As temperature increases, the capacity of aggregates to retain moisture generally decreases, which can affect the workability and compaction of the material. If aggregates are too warm, they may dry out more quickly, leading to challenges in achieving optimal moisture content for compaction, which is vital for the stability and strength of the base layer.

In terms of compaction, higher temperatures can alter how aggregates interact with one another during the compaction process, potentially resulting in decreased density if not managed properly. Conversely, at lower temperatures, aggregates may retain more moisture, which can enhance their cohesiveness and improve the compaction process.

The other options do not accurately capture the essential effects of temperature on aggregate behavior. The idea that temperature has no measurable impact ignores the extensive research that shows how temperature fluctuations influence material properties. The claim that temperature increases compressive strength isn't directly supported, as compressive strength is typically more closely related to the curing conditions and hydration processes than to temperature alone. Lastly, while temperature can affect setting times, this is more relevant to concrete mixtures that include cement rather than aggregates themselves. Therefore, the correct choice reflects the nuanced relationship between temperature, moisture