What is the range of grading modulus?

The grading modulus, often used in civil engineering and materials science, is a measure of the fineness or coarseness of aggregate materials. It is calculated by dividing the cumulative percentage of aggregate retained on a specified sieve by the percentage passing through that sieve. Typically, the grading modulus ranges from about 2.0 to 3.0 for coarse aggregates, with lower values indicating finer aggregates and higher values indicating coarser aggregates. The specific range may vary based on the application and standards set by relevant authorities.