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Portland Pozzolana Cement – Manufacture, Properties and Uses

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Portland Pozzolana cement is integrated cement which is formed by synthesising OPC cement with pozzolanic materials in a certain proportion. It is commonly known as PPC cement. In this article we discuss about the properties, manufacture, characteristics, advantages and disadvantages of Portland Pozzolana cement.

What is pozzolana or pozzolanic material?

Pozzolana is a volcanic powder found in Italy near Vesuvius. A pozzolanic material can be a natural or artificial which contains silica and aluminous in a reactive form. This materials usually doesnt posses any cementitious properties, but when it is mixed with water or moisture or lime to undergo reaction with calcium hydroxide to form compounds possessing cement properties.

Fig 1: Use of PPC in marine structure.

Types of pozzolana materials :

1. Artificial pozzolana

Fly ash, silica fume, rice husk, blast furnace slag.

2. Natural pozzolana

Burnt clay, pumicite, diatomaceous Earth.

Manufacture of Portland pozzolana cement

Properties of Portland Pozzolana Cement

Uses of Portland Pozzolana Cement

  1. Used in hydraulic structures, marine structures, construction near the sea shore, dam construction etc.
  2. Used in pre-stressed and post-tensioned concrete members.
  3. Used in masonry mortars and plastering.
  4. As it gives better surface finish, it is used in decorative and art structures.
  5. Used in manufacture of precast sewage pipes.
  6. Used under harsh concreting conditions.

Advantages of Portland Pozzolana Cement

  1. it is an eco-friendly cement as the material used in the manufacture are made of natural recycled waste.
  2. It is very fine cement hence very good when used for plastering works.
  3. Pozzolano consists of silica material which makes it cheap and hence reduces the cost of the cement making it economical to use.
  4. Pozzolana cement has very good resistance against sulphate attack hence is used in hydraulic structures, marine structures, construction near the sea shore, dam construction etc.
  5. PPC used in pre-stressed and post-tensioned concrete members.
  6. It reduces the carbon monoxide emission from the concrete making it environmental friendly.
  7. As the pozzolano materials are very fine, it can fill gaps between the reinforcement and aggregate , thus reducing the shrinkage, honeycomb formation and bleeding can be reduced, which in turn increases the strength and durability of concrete.

Disadvantages of Portland Pozzolana Cement

  1. The initial strength obtained is less, which effect the de-shuttering of supports early.
  2. As it contains more fine material, handing of concrete is difficult.
  3. When compared to the OPC setting time is less for PPC
  4. Reduction in alkanity reduces the resistance to corrosion of steel reinforcement
  5. As the strength of this concrete gains slowly, curing process is very important. Any error in this could cause durability problems.
Read More : Applications of Different Cement Types for Concrete Construction
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