What are the grading zones for fine aggregate (sand)?

Fine aggregates are classified into four zones (I, II, III, and IV) based primarily on the percentage passing the 600-micron IS Sieve (Table 3).

Is manufactured sand (M-sand) permitted by IS 383?

Yes, the 2016 revision explicitly includes crushed stone sand (M-Sand) and mixed sand, detailing their specific fines limits and grading requirements.

What is the maximum allowed Combined Flakiness and Elongation Index?

The combined index for uncrushed or crushed coarse aggregate should not exceed 40% by mass (Table 9).

Can recycled concrete aggregates (RCA) be used in structural concrete?

Yes, but with strict limitations. Table 1 permits up to 20% RCA for plain concrete, but limits its use in reinforced concrete to specific moderate conditions and a maximum concrete grade of M25.

IS 383

: 2016

Coarse and Fine Aggregates for Concrete - Specification

CurrentEssentialSpecificationMaterials Science · Concrete

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This standard specifies the physical properties, mechanical limits, and grading requirements for naturally sourced, manufactured, and alternative (recycled) coarse and fine aggregates for use in concrete. It is the fundamental standard for evaluating aggregate quality for concrete mix design in India.

Specifies requirements for coarse and fine aggregates derived from natural sources for concrete.

Quick Reference Values

aggregate crushing value wearing surfaceMax 30%

aggregate crushing value other concreteMax 45%

aggregate impact value wearing surfaceMax 30%

aggregate impact value other concreteMax 45%

combined flakiness and elongation indexMax 40%

los angeles abrasion value wearing surfaceMax 30%

los angeles abrasion value other concreteMax 50%

Practical Notes

The 2016 revision officially introduced and set limits for alternative materials like Recycled Concrete Aggregates (RCA), Iron Slag, and Manufactured Sand (M-Sand).

Fine aggregates are classified into Zones I, II, III, and IV. Zone IV sand is very fine and generally requires careful mix design adjustments before use in structural concrete.

Flakiness and elongation are evaluated as a combined maximum limit of 40% for crushed/uncrushed coarse aggregate, rather than separate independent limits.