# What is meant by fineness of cement, and why it is necessary?

**WHAT IS FINENESS OF CEMENT?**

The fineness of cement is the property of cement that indicates particle size of cement and specific surface area. and indirectly effect heat of hydration.

**IMPORTANCE/EFFECT OF FINENESS OF CEMENT:**

- The fineness of cement
**affects hydration rate hence the rate of strength gain.** - The smaller the particle size, the greater the surface area-to-volume ratio, and thus, the
**more area available for water-cement interaction per unit volume.** - Therefore
**finer cement reacts faster**with water and the rate of development of strength and corresponding heat of hydration is high. - Fineness is a measure of how even each granule is, leading to
**a greater surface area & greater the surface area more the adhesion.** **Bleeding can be reduced by increasing fineness**. However, increased fineness can also lead to the requirement of more water for workability, resulting in a higher possibility of dry shrinkage.- Fineness test is used to check the proper grinding of cement and measures the surface area of the cement particles per unit mass.

**FINENESS LIMIT:**

It should not exceed the following percentage by weight for different types of cement.

- Ordinary Portland cement =10%
- Rapid hardening cement =5%
- Low heat cement =5%