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Digital Los Angeles Abrasion Machine is used for the determination of aggregates resistance to fragmentation.


ASTM - C131





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There is also a Los Angeles Abrasion Device with Soundproof Safety Cabinet. In accordance with CE safety directive, it is made of steel and internally covered with sound insulation material for sound insulation. When the cabinet door is opened while the appliance is running, a micro switch automatically stops the drum from rotating.

The Locking Mechanism is also available on request (must be installed at the factory) and must be ordered separately. The locking mechanism assists the user when filling the samples and locking the door.

Abrasion Balls must be ordered separately according to the standards.


The machine consists of an electronic control unit and a rolled steel drum having an inside diameter of (711 ± 5) mm and internal length (508 ± 5) mm. The drum is rotated at a speed of between 31 and 33 r.p.m. Thanks to the rev counter, the motor stops by rotating the set number. It has a tray to collect the material and ball load after the experiment.


Los Angeles Features

  • Digital counter and auto stop after testing.
  • Optional soundproofing cabinet.
  • Safety stop on door opening.
  • 31 – 33 r.p.m.
  • 711 mm Internal Diameter.
  • 508 mm length.




Why we test abrasion value of coarse aggregates ?

The abrasion value of the aggregates is determined in order to determine their Resistance against wearing. In this the aggregate sample is mixed with abrasive charge consisting standard balls & rotated in closed inclined cylinders for specific number of revolutions.

Apparatus Required for the Test:

  • Los Angeles Machine:- It consists of a hollow steel cylinder, closed at both the ends with an internal diameter of 700 mm and length 500 mm and capable of rotating about its horizontal axis.
  • Cast iron or steel balls, approximately 48 mm in diameter and each weighing between 390g to 445 g; 6 to 12 balls are required.
  • IS sieve
  • Balance

IS code for aggregate abrasion value test :- 

  • IS: 2386 (Part IV) – 1963
  • IS: 383-1970

Procedure of the Test

  1. The test sample shall consist of clean aggregate which has been dried in an oven at 105 °C to 110 °C to substantially constant weight and shall conform to one of the grading shown in Table.
  2. The grading or grading used shall be those most nearly representing the aggregate furnished for the work.
  3. The test sample and the abrasive charge shall be placed in the Los Angeles abrasion testing machine and the machine rotated at a speed of 20 to 33 rev/min.
  4. For grading A, B, C and D, the machine shall be rotated for 500 revolutions; for grading E, F and G, it shall be rotated for 1000 revolutions.
  5. The machine shall be so driven and so counter-balanced as to maintain a substantially uniform peripheral speed.
  6. If an angle is used as the shelf, the machine shall be rotated in such a direction that the charge is caught on the outside surface of the angle.
  7. At the completion of the test, the material shall be discharged from the machine and a preliminary separation of the sample made on a sieve coarser than the 1.70 mm IS sieve.
  8. The material coarser than the 1.70 mm IS Sieve shall be washed dried in an oven at 105 °C to 110°C to a substantially constant weight, and accurately weighed to the nearest gram.

Tabular Column

Table:- Specified Abrasive Charge

Grading Number of Spheres Weight of Charge (g)
A 12 5000 土 25
B 11 4584 土 25
C 8 3330 土 20
D 6 2500 土 15
E 12 5000 土 25
F 12 5000 土 25
G 12 5000 土 25

Table:- Gradings of Test Samples
Gradings of Test Samples



Trail 1 Trail 2
Total weight of dry sample taken= W1 g
Weight of portion passing 1.7 mm sieve= W2 g
Aggregate abrasion value = (W2/W1) x 100(%)
 Los Angeles Abrasion Testing Machine 


Mean Los Angeles Abrasion value =………… %

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