15.2.2 Frequency The minimum frequency of sampling of concrete of each grade shall be in accordance with the following: Quantity of Concrete in the Number of Samples
Quantity of Concrete in the work , m 3
No of samples
1-5
1
6-15
2
16-30
3
31-50
4
51 and above
4 plus one additional sample for each additional 50 m 3 or part thereof
NOTE - At least one sample shall be taken from each shift where concrete is produced at continuous production unit, such as ready-mixed concrete plant, suppliers and purchasers may agree upon frequency of sampling mutually by suppliers and purchasers.