What are the advantage of adding pozzolana to cement?

Addition of pozzolana:

• It increases the workability.
• It can reduce permeability.
• Reduces water evaporation.
• Honey combing will be reduced.
• Improves cohesion that means less segregation.
• Increases the elastic modulus of concrete.
• Less heat of hydration.
• Offers greater resistance to aggressive weather.

Why is pozzolana added to lime?

The addition of pozzolan to any lime mortar (hydraulic or non-hydraulic) will modify its characteristics. Pozzolanic materials can combine with uncarbonated lime (calcium hydroxide) to form stable compounds, thus reducing the risk of early leaching or frost damage and increasing the potential durability of the mortar.

Why are pozzolans used in concrete mixtures?

Typically pozzolans are used as cement replacements rather than cement additions. Adding pozzolans to an existing concrete mix without removing an equivalent amount of cement increases the paste content and decreases the water/cement ratio. Replacing some of the cement with pozzolans preserves the mix proportions.

What is pozzolanic material What benefits can be achieved by using pozzolana with cement in concrete?

Pozzolans can be used to control setting, increase durability, reduce cost and reduce pollution without significantly reducing the final compressive strength or other performance characteristics.

What is pozzolanic effect?

The pozzolanic reaction is the chemical reaction that occurs in portland cement upon the addition of pozzolans. The pozzolanic reaction converts a silica-rich precursor with no cementing properties, to a calcium silicate, with good cementing properties.

What is the meaning of pozzolanic?

Definition of pozzolana : finely divided siliceous or siliceous and aluminous material that reacts chemically with slaked lime at ordinary temperature and in the presence of moisture to form a strong slow-hardening cement.

What are pozzolanic materials enumerate various types of pozzolanic materials What are the advantages of pozzolanic materials?

Pozzolanic materials are siliceous and aluminous materials, possessing little or no cementitious value by themselves, but in finely divided form and in the presence of moisture react chemically with calcium hydroxide liberated on hydration of cement at ordinary temperature to form compounds, possessing cementitious …