Portland Pozzolana Cement

Portland pozzolana cement is a blended cement in which OPC clinker is intergrinded with gypsum and pozzolanic material in certain proposition. It is also produced by grinding them separately and rigorously blending them in certain proportions.

Compostion of Portland Pozzolana Cement

The main chemical components of Portland cement are calcium, silica, alumina and iron. It is obtained from limestone, marl or chalk, while silica, alumina and iron come from the sands, clays and iron ore sources.

Why Pozzolanic material is used in Cement?

It helps to increase the strength of concrete and therefore consumption of PPC in the making of concrete is lesser than OPC and so it is more cost effective.

Types of pozzolanamaterials :

1. Artificial pozzolana

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

2. Natural pozzolana

Burnt clay, pumicite, diatomaceous Earth.

Usages of Portland Pozzolana Cement

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

Advantages of Portland Pozzolana Cement

·       ->  Materials which is used in the production of PPC are made of natural recycled wastes and therefore it is an eco-friendly cement.

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       -> It is used in hydraulic structures, marine structures, construction near the sea shore, dam construction etc. because it has a very good resistance against sulphate attack.

·         

          -> It is environment friendly as it reduces the carbon monoxide emission from the concrete making.

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      -> Shrinkage, honeycomb formation and bleeding can be reduced in the construction because the pozzolano materials are very fine, it can fill gaps between the reinforcement and aggregate and this results in increase the strength and durability of concrete. 

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          -> This is widely used in pre-stressed and post-tensioned concrete members.

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          -> It is very good to use in plastering work as it is a very fine cement.

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           -> It is very economical to use as it reduces the cost of cement because pozzolana consists of silica material which makes it cheap.

Disadvantages of Portland Pozzolana Cement

·         -> Handing of concrete is difficult as it contains very fine material.

·         -> Setting time is less compared to OPC.

·         -> It reduces the resistance of corrosion of steel reinforcement as reduction in alkanity.

·         -> It effects the de-shuttering of supports early as the initial strength obtained is less.

           

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