HOW MUCH AGGREGATE SAMPLE SHOULD WE COLLECT?
The amount of aggregate sample to be collected is dependent on the maximum nominal size of aggregate. The quantity of aggregate sample should be of such amount, so that the required test can be performed to judge its quality. Sample of aggregate is collected using a sampling scoop.
Collect a no of increments (at least 10), at regular interval, so that the minimum amount of gross sample becomes equal to the amount given in the following table.
Minimum Weight of Gross Sample
Maximum Nominal Size of Aggregate (mm) 
Minimum Weight of Gross Sample (kg) 
For Fine Aggregate 

2.36 
10 
4.75 
10 
For Coarse Aggregate 

9.5 
10 
10 
10 
12.5 
15 
13.2 
15 
16.0 
20 
19.0 
25 
20.0 
25 
25.0 
50 
37.5 
75 
40.0 
80 
50.0 
100 
63.0 
125 
75.0 
150 
80.0 
160 
90.0 
175 
Notes
 The minimum amount of gross sample to be collected is 10 kg.
 For aggregates having maximum nominal size more than 20 mm, the minimum weight of gross sample (in kg) is two times its maximum nominal size.
 For all in aggregates, minimum weight of gross sample shall be the mass of coarse aggregate (minimum) plus 10 kg.
 An increment means the quantity of aggregates obtained by a sampling device at one time.