What is Fineness of Cement?

While getting my home constructed, I came across the term fineness of cement. I wasn’t very much aware of

what is fineness of cement, so I asked my builder about it. I will share with you what he told me about it.

The precise surface area of cement is used to express the fineness of cement, which is a parameter of cement particle size. The cement sample is sieved via a standard IS sieve for the fineness test. Calculations are made to determine the volume of cement particles larger than 90 microns and the proportion of retained cement particles. This is referred to as cement's fineness.

Why Fineness of Cement value Test Required?

• When cement is combined with water and a thin sheet forms around the particle, we understand that cement hydrates.

• The cement particles begin to separate as this thin layer expands. The cement hydration procedure is slowed considerably as a result.

• On the other hand, smaller cement particles respond far more quickly than larger ones.

• While a cement fragment with a diameter of 10 m takes roughly one month to completely react, one with a diameter of one m reacts completely in one day.

• The downside of having too many tiny particles in cement is that it sets up too quickly, resulting in no opportunity for mixing, handling, or placement

• Cement must therefore be produced in a variety of particle sizes in order to extend the setting time. This cement parameter is measured by the cement test's fineness.

What is meant by fineness of cement significance?

1) An increase in fineness and hydration heat This is because cement's increased surface area necessitates a higher water content.

2) Bleeding is decreased by making the cement more finely ground. This is brought on by a rise in the surface area and water absorption capacity.

3) Surface increases as fineness increases. As a result, more water is needed, and if calculations are made incorrectly, concrete structures may experience dry shrinking.

4) If the particles are tiny. The surface area has increased. They are more glued to one another.

I hope now you understand what is

what is fineness of cement.