Benefits of PPC (Portland Pozzolana Cement)

Advantages of PPC in Fresh Concrete

Portland Pozzolana Cement (PPC) has the following advantages when concrete is in its fresh state.

1. Practicality

Portland pozzolana cement consists of spherical cement particles and has a high quality value. Due to the spherical shape the concrete moves more freely and the greater fineness of the particles allows the pores to be filled better. This type of cement also gives better cohesiveness to the concrete. PPC cement also reduces the rate of falling of concrete compared to concrete made from ordinary cement, especially in hot weather.

2. Bleeding

Bleeding is a type of separation in which some of the water in the concrete rises to the surface of the fresh concrete. As a result of bleeding, the top surface becomes too wet and the concrete will become porous, weak and durable. PPC cement reduces bleeding by providing more fine volume and less water content for a given working capacity. It also helps to block the bleed water channels.

3. Pumpability

PPC cement helps to produce a more cohesive concrete and is less prone to separation and bleeding. The spherical shape of the particles serves to increase work efficiency and pump efficiency by reducing friction between aggregate particles and between concrete and the pump line.

4. Setting Time and Expiration

PPC cement slightly prolongs the setting time of concrete which helps the mason in good finishing of concrete or cement mortar. The cohesion of the concrete mix helps in better finishing of the concrete.

Advantages of PPC in Hardened Concrete

Portland Pozzolana Cement (PPC) has the following advantages when concrete is in its hardened state.

1. Compressive Strength and Rate of Strength Gain

The rate of strength and strength of concrete made from PPC will be equal to that of normal concrete in 28 days. The silicate formation of PPC continues even after the rate of hydration of ordinary cement has slowed down. This results in an increase in strength at a later age. This high rate of potency gain will continue over time and result in an increase in later age strength.

2. Modulus of Elasticity

The modulus of elasticity of PPC concrete is somewhat lower at younger ages and slightly higher at later ages than that of normal concrete.

3. Concrete to Steel Bonding

The bond or adhesion of steel to concrete depends on the area of ​​contact of the steel with the concrete, the depth of reinforcement and the density of the concrete. PPC being finer in nature usually increases the amount of paste and reduces bleeding which will lead to increased contact, resulting in better bonding with the steel.

4. Heat of Hydration

The hydration of PPC is a slower process than the hydration of ordinary cement, resulting in slower heat generation and lower internal stresses in the concrete. Thus PPC becomes the ideal cement for large scale concreting such as dams, retaining walls, large foundations etc.

5.Low shrinkage

PPC in concrete helps to reduce drying shrinkage and plastic shrinkage. Drying shrinkage is reduced due to low internal concrete stress and slow heat generation. Plastic shrinkage is also significantly reduced because using PPC the concrete bleeds less at a given slump or workability.

6. Permeability

If concrete has interconnected spaces, the concrete becomes permeable. In PPC concrete, lime [Ca (OH)2] During initial hydration the free reactive is consumed by the silica and forms an insoluble cementitious compound instead of leaching onto the surface of the concrete. It helps in reducing the spaces and also blocks the capillary channels and subsequently reduces the permeability of the concrete.

Er. Mukesh Kumar

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Er. Mukesh Kumar is Editor in Chief and Co-Funder at ProCivilEngineer.com Civil Engineering Website. Mukesh Kumar is a Bachelor in Civil Engineering From MIT. He has work experience in Highway Construction, Bridge Construction, Railway Steel Girder work, Under box culvert construction, Retaining wall construction. He was a lecturer in a Engineering college for more than 6 years.