What are gradation limits and why are they important in aggregate testing?

Gradation limits are essential in aggregate testing as they outline the acceptable ranges of particle sizes that make up a given aggregate material. This is particularly important for ensuring that the aggregate achieves the desired stability and drainage characteristics when used in construction applications, such as in base layers for pavements and foundations.

The distribution of different particle sizes within the gradation limits affects how well the aggregate interlocks and supports loads, which directly influences the strength and durability of the final structure. A well-graded aggregate can provide greater stability and effective drainage, preventing issues such as excessive settlement or water accumulation, which can lead to damage over time.

Other options might mention aspects of aggregate properties, such as visual quality and color, but those do not directly relate to the fundamental role of gradation limits in engineering contexts. The focus on stability and drainage underscores their significance in achieving reliable and long-lasting construction outcomes.