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LOS ANGELES ABRASION TEST

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by

FJ Zulkifli

on 12 October 2014

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Transcript of LOS ANGELES ABRASION TEST

LOS ANGELES ABRASION TEST
OBJECTIVE
The objective of this study is to assess the resistance to crushing and abrasive wear of an aggregate by means of the Los Angeles Abrasion Machine
INTRODUCTION
measure of degradation of mineral aggregates of standard grading resulting from a combination of action including abrasion and grinding in a rotation steel drum containing a specific number of steel spheres.
give a measure of aggregate hardness, as specified and required for use in highway projects.
also determine the quality of the aggregate.
APPARATUS
LOS ANGELES ABRASION TEST
-Los Angeles Abrasion Machine
Eleven steel bals- wit 51mm in diameter and 400 in weight for each
Metal tray
Sieve analysis 19mm, 9.5mm, 1.7mm and pan.
Sieve shaker
Balance- accurate to 0.01g
Fine haired brush
RESULT
LOS ANGELES ABRASION VALUE

-
DISCUSSION
The original aggregates weight = 5 kg. (2.5 kg from size 14, 2.5 kg from size 10)
#60.4 % (3.020 kg) that does not passed the 1.7mm sieve.
#39.6%(1.98kg), passing the 1.7 mm sieve.
WAYS/METHOD
1. The Los Angeles machine (figure 1) is constructed according to the dimensions and specification of ASTM C131
2. A washed and oven-dried sample of aggregates were prepared and graded according to the job application. (W1)
3. The sample is placed in the drum with the appropriate number of steel balls. (46.0 to 47.6 mm diameter, weighing 400 to 440 g each tables 1 and 2)
4. The drum was rotated for 500 revolutions at a speed of 30 to 33 rpm.
5. The sample was separated on a sieve larger than 1.7 mm sieve. If the aggregate is free from dust, the washing requirement may be waived.
6. The material that does not pass the 1.7 mm sieve were weighted. (W2)


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