PPC vs OPC Cement. When to use which?

PPC (Portland Pozzolana Cement) and OPC (Ordinary Portland Cement) are two common types of cement used in construction, each with distinct properties and suitable applications. OPC is further graded in OPC 33, 43, 53 grade. This is the compressive strength of the cement, and higher is better. There are no sub-grades of PPC cement.

1. Composition:

• OPC (Ordinary Portland Cement): OPC is produced by grinding together a mixture of limestone and clay (or similar materials), which contain the required amount of calcium oxide. It is the most widely used cement type in construction.

• PPC (Portland Pozzolana Cement): PPC is produced by adding pozzolanic materials like fly ash, volcanic ash, calcined clay, etc., to OPC clinker during the grinding process. This addition enhances the properties of the cement.

2. Setting Time:

• OPC: Typically has a faster setting time compared to PPC.
• PPC: Generally has a slower setting time due to the pozzolanic materials present.

3. Strength:

• OPC: Provides higher initial strength compared to PPC.
• PPC: Develops strength over a longer period and tends to have higher ultimate strength than OPC over time.

4. Heat of Hydration:

• OPC: Tends to generate more heat during hydration, which is beneficial in cold weather conditions.
• PPC: Produces less heat during hydration, making it suitable for mass concrete pours where temperature rise needs to be controlled.

5. Cost: OPC Cement has a higher cost than PPC Cement.

HomeRun Recommendation:

• OPC: Use it for Casting & RCC works due to early strength.

• PPC: Use it for Plastering & Masonry works due to its finer particles & workability.