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.
- AIV Testing Machine
- Electronic Balance
- Sieves 12.5 mm, 10 mm and 2.36 mm
- Test Trays
- Sample of 20mm Aggregate
- Take the sample aggregate
- Pass the sample with 12.5 mm sieve and retained on 10 mm sieve.
- 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).
- Now Weight the Sample (i.e. Weight of Sample and Cup – Weight of Empty cup) = W1 gm
- Now Take the sample in AIV Testing cup and Stoke 15 times from AIV testing Machine.
- Take out the sample and pass the sample with 2.36 mm sieve = W2 gm
- Check the Total weight passed by 2.36 mm Sieve.
|Name of Quarry||Date of Testing|
|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|
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
- <10% = Strong Aggregate, It can be used in any type of construction work.
- 10 to 20% = Exceptionally Strong aggregate, Used in general construction work.
- 20 to 30% = Slightly Weak aggregate, used in Road Work.
- 30 to 40% = More Weak aggregate, Used at side purpose.
- More than 40% = Weakest, Not used as a aggregate