Which of the following statement is correct about Portland Pozzolana Cement (PPC)?

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JKSSB JE (Civil) Official Paper (Held On: 19 Nov, 2023)

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The long term strength of PPC is less and it has reduced heat of hydration and permeability.
The long term strength of PPC is more and it has enhanced heat of hydration and permeability.
The long term strength of PPC is more and it has reduced heat of hydration and permeability.
The long term strength of PPC is less and it has reduced heat of hydration and enhanced permeability.

Answer 1

Explanation:

Long-term strength:
PPC develops strength at a slower rate initially but achieves higher long-term strength due to the pozzolanic reaction continuing over time.
Heat of hydration:
The presence of pozzolanic materials in PPC leads to a reduction in heat of hydration, making it suitable for mass concreting where thermal cracking is a concern.
Permeability:
PPC produces a denser and less porous concrete, leading to lower permeability and improved durability in aggressive environments.

Additional InformationPortland Pozzolana Cement (PPC)

Composition:
PPC is manufactured by grinding Portland cement clinker with pozzolanic materials (such as fly ash, calcined clay, or silica fumes) and gypsum.
Durability:
Due to its low permeability and dense microstructure, PPC offers greater resistance to chemical attacks, especially from sulphates, chlorides, and alkalis.
Environmental Benefit:
The use of industrial by-products like fly ash in PPC makes it more eco-friendly by reducing carbon emissions and promoting sustainable construction.
Workability and Finish:
PPC provides better workability and surface finish due to the finer particles and longer setting time, which allows better compaction and finishing of concrete surfaces.