1) Sandy Equivalent (SE) > 75%
2) Fineness Modulus (FM) that should be: 2.4 < FM < 3.2
If Fineness Modulus increases more than 3.2, we have to use more cement to reach our specific compressive strength of concrete accompanied by high workability (75mm < slump < 100mm) in which we will not have any economic savings.
F.M =fineness modulus
As we can see, F.M is completely referred to sieve analysis of the fine aggregate.
0.150 mm (No. 100), 0.30 mm (No. 50), 0.60 mm (No. 30), 1.18 mm (No. 16), 2.36 mm (No. 8), 4.75 mm (No. 4), 9.5 mm (0.375-in.)