The Fineness test of Cement is completed by sieving cement pattern thru the preferred IS sieve. the load cement particle whose size greater than ninety microns is decided and the share of retained cement particle is calculated. this is known as the Fineness of cement.

Why Fineness Test of Cement Required?
We know that cement hydrates while cement is mixed with the water and a thin layer are fashioned around the particle.
This thin layer grows larger and makes cement debris separate. due to this, the cement hydration process slows down.
On the different hand, cement smaller debris react much quicker than larger particles.
A cement particle with a diameter of oneµm will react totally in 1 day, while the particle with a diameter of 10µm takes about a month.