Los Angeles Abrasion Test — Lab Manual

Objective & standard

Resistance of aggregate to wear and degradation.

Standard: ASTM C131 / C535

Apparatus

• LA machine drum, steel balls (charge by grading)
• Sieves 1.70 mm
• Balance, oven

Procedure

1. Prepare 5000 g of the specified grading (A, B, C or D).
2. Load the drum with the sample and the steel charge.
3. Rotate 500 revolutions at 30–33 rpm.
4. Sieve on 1.70 mm; wash and dry the retained part and weigh.
5. Loss = original − retained.

Calculations

• LA loss (%) = (W1 − W2) ÷ W1 × 100

Typical values: Bituminous wearing course ≤ 30–35 %, base ≤ 40–50 %, concrete aggregate ≤ 50 %.

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Data sheet (print this page)

Project: ____________________   Sample: __________   Date: __________   Tested by: __________

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