AGGREGATE ABRASION VALUE

Updated: Jul 16, 2020

2.3 AGGREGATE ABRASION VALUE

AIM

To determine the abrasion value of coarse aggregates as per

IS: 2386 (Part IV) - 1963.

APPARATUS


i) Los Angles abrasion testing machine

ii) IS Sieve of size - 1.7mm

iii) Abrasive charge - 12 nos. cast iron or steel spheres

approximately 48mm dia. and each weighing between 390

and 445g ensuring that the total weight of charge is 5000 +

25g

iv) Oven

PREPARATION OF SAMPLE

The test sample should consist of clean aggregates which has

been dried in an oven at 105 to 110 °C to a substantially constant

weight and should conform to one of the gradings shown in the

table below:




PROCEDURE

The test sample and the abrasive charge should be placed in the

Los Angles abrasion testing machine and the machine rotated at

a speed of 20 to 33 revolutions/minute for 1000 revolutions. At

the completion of the test, the material should be discharged and

sieved through 1.70mm IS Sieve.


REPORTING OF RESULTS

i) The material coarser than 1.70mm IS Sieve should be

washed, dried in an oven at a temperature of 100 to 110 °C to

a constant weight and weighed (Weight 'B').

ii) The proportion of loss between weight 'A' and weight 'B' of

the test sample should be expressed as a percentage of the

original weight of the test sample. This value should be

reported as,

A - B

Aggregate abrasion value = ———– x 100%

A



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