Aggregate Crushing Value
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AGGREGATE CRUSHING VALUE
This test helps to determine the aggregate crushing value of coarse aggregates as per IS: 2386 (Part IV) – 1963. The apparatus used is Cylindrical measure and plunger, Compression testing machine, IS Sieves of sizes – 12.5mm, 10mm and 2.36mm
Procedure to determine Aggregate Crushing Value
i) The aggregates passing through 12.5mm and retained on 10mm IS Sieve are oven-dried at a temperature of 100 to 110oC for 3 to 4hrs.
ii) The cylinder of the apparatus is filled in 3 layers, each layer tamped with 25 strokes of a tamping rod.
iii) The weight of aggregates is measured (Weight ‘A’).
iv) The surface of the aggregates is then leveled and the plunger inserted. The apparatus is then placed in the compression testing machine and loaded at a uniform rate so as to achieve 40t load in 10 minutes. After this, the load is released.
v) The sample is then sieved through a 2.36mm IS Sieve and the fraction passing through the sieve is weighed (Weight ‘B’).
vi) Two tests should be conducted.
Aggregate crushing value = (B/A) x 100%.
October 14th, 2008 at 5:06 pm
hello .. i nood ask about the higher and the low result for aggregate crushing value test . if u dont mind send the me the nomber .
thank u alot
October 24th, 2008 at 6:06 am
Hello,
What is the relationship between the compressive strength and tensile strength of the concrete?
January 21st, 2009 at 3:31 am
Dear Sir/Madam,
Customer said the crushing value of aggregate must higher than 3 but I see the normal test result for ACV is is % of original mass?
Could u expalin. Thanks.
Regards,
VC Lye (Mr.)
January 27th, 2009 at 10:01 am
WHAT IS THE RELATIONSHIP OF AIV & LAV ?
August 12th, 2009 at 4:54 pm
i want to know what is the difference between compressive strength and crushing value. of aggregates.
August 31st, 2009 at 4:16 am
if u don’t mind..
please send me the percentage value for AIV…
September 15th, 2009 at 10:18 am
AS THE I.S CONSIDERATIONS SIZE OF AGGREGATE FOR CRUSHING VALUE SHOULD LIES BETWEEN 10-12.5MM
WT VARIATION I RESULT IS EXPECTED WHEN SMALLER SIZE AGGREGATE IS USED IN TEST??
September 17th, 2009 at 11:11 pm
Aggregate Crushing value depends on the shape of agg also. Angular aggregates have a lower
ACV, than Irregular or rounded aggregates.If we cut a core out of the same agg
(Say in the quarry) and test for compressive strength, will give a higher MPa value.
It can be considered as a concrete cylinder or UCS tested in lab. So it is hard to corelate
ACV to core(UCS)strength. Core cut from the agg shears under crushing, but ACV is different.
This is not a direct answere to your question but some thoughts.
January 13th, 2010 at 6:14 am
i want to know the importance of impact value of coarse aggregate
January 29th, 2010 at 3:19 am
Dear Sir/Madam,
I want to know the relationship between ACV and TFV, if there is correlational eqautions?