Los Angeles testing machine is used to conduct

Explanation:

Abrasion Test: 

• Abrasion test is carried out to test the hardness property of aggregates.

Los Angeles abrasion test:

• The principle of Los Angeles abrasion test is to find the percentage wear due to relative rubbing action between the aggregate and steel balls used as abrasive charge.

​Los Angeles testing machine:

• The Los Angeles abrasion testing machine shall consist of a hollow steel cylinder arranged for rotating about its axis in a horizontal position.
• The hollow cylinder shall be made of steel with its ends closed, the cylindrical shaft mounted on stub shafts attached to both ends but not entering it.
• The principle of the Los Angeles Abrasion Test is to find the percentage of wear due to relative rubbing action between the aggregate and steel balls used as an abrasive charge.
• Los Angeles machine consists of a circular drum of internal diameter 700 mm and length 520 mm mounted on a horizontal axis enabling it to be rotated. An abrasive charge consisting of cast iron spherical balls of 48 mm diameters and weight 340-445g is placed in the cylinder along with the aggregates.
• The cylinder is then locked and rotated at the speed of 30-33 rpm for a total of 500-1000 revolutions depending upon the gradation of aggregates.
• After specified revolutions, the material is sieved through a 1.7 mm sieve, and the passed fraction is expressed as a percentage total Weight of the sample.