AGGREGATE ABRASION VALUE
This test helps to determine the abrasion value of coarse aggregates as per IS: 2386 (Part IV) – 1963.
The apparatus used in this test are Los Angles abrasion testing machine, IS Sieve of size – 1.7mm, 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 and Oven.
Sample Preparation
The test sample should consist of clean aggregates which has been dried in an oven at 105 to 110oC to a substantially constant weight and should conform to one of the gradings shown in the table below:
Procedure to determine Aggregate Abrasion Value
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 110oC 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,
Aggregate abrasion value = (A-B)/B x 100%.
If you have a query, you can ask a question here.
can you provide range of crushing value,impact value,abrasion value of standard aggregates.
very useful information.
Please help some procedures to follow in abration tes according to British Standards
I am a student studying at Mbeya Institute of science and Technology
in Tanzania
can you provide the specification refer to BS code range of
crushing value, impact value & abrasion value for concreting process
Can you rank the tests in their order of importance and cite your reason for saying so?
AIV, ACV, LAAV, SOUNDNESS and PSV
according to AASHTO 90 LAAV for base course should be less than 40% and for sub base course it should be less than 50%.
what is range of acceptable percentage of abration for aggregate that use for ready mix concrete
can u provide me the acceptance criteria for the aggregate crushing, impact, abrassion test.please
why 40 ton is applied for determining crushing value of coarse aggregates. Why not 50 or some other value
why is 1.7mm sieve used in LAA?
thanks yaar…
good…. it was so helpful thanks……
thanks yar……..
That’s really helpful to do the test in laboratories,thanks cep
Waawooo its really helpfull thanks alot
Actually brother we are not determining the value for mixers. Actually abrasion value is determined for the use in pavement like for subsurface course the abrasion value of agg should be 40% and for surtace course it should be 60%
It does not matter that you are mixing a material manually or automatically by mixer 🙂
why does the sample need to be dried and washed before and after the test?
Is Los Angles abrasion testing machine the only machine used as tool / apparatus for the Aggregate Abrasion Value??