How you divide fine aggregate in different zones?

Fine aggregate is typically divided into different zones based on the particle size distribution as specified by standards such as IS 383 in India. The classification includes four zones (I to IV), with Zone I having the coarsest particles and Zone IV the finest. Each zone has specific limits for the percentage passing through various sieve sizes, allowing for the appropriate selection of fine aggregates according to the requirements of the concrete mix. This classification ensures consistency in performance and workability of the concrete.