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# Aggregate Impact Value Test

AIV test is conducted to determine the Aggregate Impact Value of Coarse aggregate. The aggregate impact value gives a relative measure of the resistance of an aggregate to sudden shock or impact, which in some aggregates differs from Its resistance to a slow compression load.

The Indian Standard CODE IS 2386 (Part IV) – 1963 is used for procedure and classification of aggregate by result.

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### Apparatus Required

1. AIV Testing Machine
2. Electronic Balance
3. Sieves 12.5 mm, 10 mm and 2.36 mm
4. Test Trays
5. Sample of 20mm Aggregate

### Procedure

1. Take the sample aggregate
2. Pass the sample with 12.5 mm sieve and retained on 10 mm sieve.
3. Fill the Cylinder Cup (Diameter 75 mm Depth 50 mm) in three layer with 25 gentle stroke each with tamping rod (10 mm in diameter and 230 mm long).
4. Now Weight the Sample (i.e. Weight of Sample and Cup – Weight of Empty cup) = W1 gm
5. Now Take the sample in AIV Testing cup and Stoke 15 times from AIV testing Machine.
6. Take out the sample and pass the sample with 2.36 mm sieve = W2 gm
7. Check the Total weight passed by 2.36 mm Sieve.

### Observation Table

 Name of Quarry Date of Testing Observation Test Sample 1 2 3 Weight of Aggregate Sample Filling in Cylinder = W1 gm Weight of Aggregate Passing the 2.36 mm Sieve after test = W2 gm AIV = W2/W1*100 Comment Signature

### Result

The ratio of the Weight of fraction passing through 2.36-mm IS Sieve to total weight of oven-dried sample.

AIV = W2/W1*100

### Appreciable Percentage of AIV Test

1. <10% =  Strong Aggregate, It can be used in any type of construction work.
2. 10 to 20% = Exceptionally Strong aggregate, Used in general construction work.
3. 20 to 30% = Slightly Weak aggregate, used in Road Work.
4. 30 to 40% = More Weak aggregate, Used at side purpose.
5. More than 40% = Weakest, Not used as a aggregate

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