Los Angeles abrasion loss

Calculate percentage wear from initial dry mass and washed, dried mass retained after abrasion.

Observations and units

• Initial oven-dry sample mass (g)
• Final dry mass retained on 1.70 mm sieve (g)

Calculation

Mass loss = initial − final retained mass; wear = 100 × mass loss / initial mass.

Method reference and limitations

IS 2386 (Part 4):1963, clauses 5.3.4–5.3.5, including supplied amendment. Two determinations of the same grading and prescribed charge/revolutions. The supplied amendment requires their mean. Choose grading and machine procedure from the standard; this worksheet does not set or verify them. No automatic grading or acceptance limit. 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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