Abrasion value Test by Los Angeles Apparatus of coarse aggregate IS 2386-Part 4

Los Angeles abrasion value Test of aggregate

Test Standard : IS 2386-Part 4

Test Apparatus  :

  1. Los Angeles test apparatus
  2. IS Sieve 80mm, 63mm, 50mm, 40mm, 25mm, 20mm, 12.5mm, 10mm, 6.3mm, 4.75mm, 2.36mm, 1.70mm, 
  3. Cast iron spheres or steel spheres approximately 48mm in diameter & each weighing between 390-445gms
  4. Hot air electric oven.

Test Procedure for Abrasion value Test :

  1. Take sample of aggregate by quartering method. (say W1, gms)  Test sample shall consists of clean aggregates dried in oven 105 to 110 degree celsius.
  2. The test sample & abrasive charge shall be placed in Los Angeles abrasion machine & it is rotated at a speed of 20 to 33 rev/min.
  3. The machine shall be rotated for 500 revolutions & 1000 revolutions for Gradings A, B, C, D & E, F, G respectively.
  4. After the completion of the test, material shall be sieved on a IS sieve coarser than 1.70mm & the finer portion shall then be sieved over 1.70mm IS Sieve. The material coarser than 1.70mm IS Sieve shall be washed dried in an oven at 105 to 110 C & accurately weight to nearest (say W2, gms
 
Sample weight shall conform to one of the grading zone shown below:

Abrasion value Test of coarse aggregate IS 2386-Part 4
Abrasion value Test of coarse aggregate IS 2386-Part 4
Los Angeles Abrasion test

The abrasive charge based upon the grading of the test sample :

 

The abrasive charge based upon the grading of the test sample shall be as:
Abrasion value Test of coarse aggregate IS 2386-Part 4
Los Angeles Abrasion Test
Test Results 
 
Abration value = ( (W1 – W2)/ W1)x100
 
Test limit :  Max = 30 % for wearing surface & 60% for Non wearing surface as per lS: 383
  
Test Format :
 

Abrasion value Test by Los Angeles Apparatus of coarse aggregate IS 2386-Part 4
Abrasion value Test of coarse aggregate IS 2386-Part 4
Test format of los angeles abrasion test of aggregate
 
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