**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 110^{o}C 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.

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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%.**

### Kanwarjot Singh

Kanwarjot Singh is the founder of Civil Engineering Portal, a leading civil engineering website which has been awarded as the best online publication by CIDC. He did his BE civil from Thapar University, Patiala and has been working on this website with his team of Civil Engineers.
If you have a query, you can **ask a question here**.

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

Hello,

What is the relationship between the compressive strength and tensile strength of the concrete?

generally tensile strenght is 10 to 12 percent of its compressive strength.

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.)

WHAT IS THE RELATIONSHIP OF AIV & LAV ?

i want to know what is the difference between compressive strength and crushing value. of aggregates.

if u don’t mind..

please send me the percentage value for AIV…

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??

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.

i want to know the importance of impact value of coarse aggregate

Dear Sir/Madam,

I want to know the relationship between ACV and TFV, if there is correlational eqautions?

Please describe for me the aggregate crushing value.

how can we say where we can use the agg (like..in road construction or pavement construction), by knowing the value of ACV

which is better TO know,ACV or 10% fines value(TFV)..?

I wish to recieve mails describing the various tests carried out on soil, cement and water in the civil engineering laboratory.thank you.

Dear Sir,

What is the effect of ACV experiment on Crushing value?

What is the numerical relationship between the ACV and the 10% fact value and how do the values relate.

From ACV results what will the maximum permissible valus to descide if aggregate can or cannot be used for concrete.

Ho do i test the quality of ballast for a railroad track.

please i would like to know the importance

of 10% fine test on chippings

what is the difference between aggregate crushing value and aggregate impact value?

load is applied gradually in crushing, in impact it is sudden loading

what would be the max and min impact,abrasive,crushing values of aggregates to have a good concrete mix