Aggregate crushing value

Calculate crushing fines as a percentage of initial surface-dry sample mass.

Observations and units

• Initial sample mass (g)
• Mass passing 2.36 mm sieve (g)

Calculation

Crushing value = 100 × mass passing the separating sieve / initial surface-dry sample mass.

Method reference and limitations

IS 2386 (Part 4):1963, clauses 2.4–2.6. Standard 12.5–10 mm sample with 2.36 mm separating sieve only. Two determinations; source trial reporting uses one decimal place and the mean a whole percent. Above 30%, the source directs use of the ten-percent-fines method. Loading procedure and specification acceptance are not checked. Publisher confirmation of the amendment-record count is outstanding.

Calculation and reporting rules audited within the documented profile; physical test execution and specification acceptance remain the operator’s responsibility. Independent qualified review is not recorded. No certificate or compliance decision.

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