What is the role of IDOT in the aggregate gradation process?

The role of the Illinois Department of Transportation (IDOT) in the aggregate gradation process primarily involves the approval of gradation targets set by producers. This is critical because IDOT must ensure that the materials used in construction projects meet specific standards and specifications. By approving these targets, IDOT helps maintain quality control and ensures the aggregates will perform as needed in various applications, such as in asphalt or concrete mixtures.

Gradation refers to the distribution of particle sizes within a given aggregate sample, which affects the workability, durability, and strength of the final product. By overseeing this aspect, IDOT supports the integrity of infrastructure projects and compliance with engineering standards.

The other roles mentioned, such as setting prices or conducting all aggregate testing, do not fall under the typical responsibilities of IDOT. The enforcement of safety regulations, while important, is a different area of focus and does not specifically pertain to the aggregate gradation process.