Coarse & Fine Aggregate — Specification

Specifies requirements for coarse and fine aggregate for use in concrete. Includes grading, deleterious matter limits, and physical/mechanical properties.

Key clauses — Rebota's plain-English summary

Paraphrased for working engineers, not a verbatim reproduction of the standard. For compliance documentation, tender submissions, or any use requiring the exact clause text, refer to the official IS 383:2016 document published by the Bureau of Indian Standards (BIS) — this summary is an interpretation aid, not a substitute for it.

• Fine aggregate zones: Zone I (coarser) to Zone IV (finer) — Zone II most preferred
• Silt content limit: 8% for crushed sand, 3% for natural sand (by mass)
• Nominal size of coarse aggregate: 40mm, 20mm, 16mm, 12.5mm, 10mm
• Aggregate Impact Value (AIV): max 30% for concrete in wearing surfaces
• Los Angeles Abrasion: max 50% for all grades of aggregate