Aggregates & Materials
Fine Aggregate
// Definition
Aggregate passing the 4.75 mm IS sieve — sand. Fills voids between coarse aggregates and contributes to workability.
Fine aggregate is graded into Zones I-IV (coarsest to finest) per IS 383. Zone II is most commonly specified.
// Related Indian Standards
IS 383
// Cross-references
M-Sand (Manufactured Sand)
Crushed stone fines manufactured to act as fine aggregate. Replaces or supplements river sand and offers consistent gradation and shape.
River Sand
Naturally occurring fine aggregate sourced from riverbeds. Increasingly restricted due to environmental regulations.
Coarse Aggregate
Aggregate retained on the 4.75 mm IS sieve. Forms the bulk of concrete volume (60-75%) and provides dimensional stability.
Fineness Modulus
A single number describing the average particle size of an aggregate, calculated from cumulative percentages retained on standard sieves.
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