What is pozzolana cement made of?

Portland Pozzolana Cement is cement manufactured by combining Pozzolanic materials. This cement comprises of OPC clinker, gypsum and pozzolanic materials in certain proportions. The Pozzolanic materials include fly ash, volcanic ash, calcined clay or silica fumes.

What is the disadvantage of PPC cement?

PPC is difficult to handle due to its high fineness. 03. Its initial strength is lower than OPC. Hence props cannot be removed early.

How strong is PPC cement?

PPC cement has a strong compressive strength and can cross 13 MPa in 3 days, 22 MPa in 7 days and 33 MPa in 28 days. The hydration and hydration levels of PPC cement are low, which is due to the variety and quantity of mixed materials.

Is sand a pozzolan?

Other Pozzolans “There are three kinds of sand. Sand which has been quarried (pozzolana) requires one-fourth its weight of lime, while river sand or sea sand requires one third.

What are the advantages and disadvantages of pozzolana cement?

Pros of PPC over OPC

• The heat of hydration of PPC is lower than that of OPC.
• PPC has higher fineness than OPC.
• PPC has high durability than OPC which means the structure will last longer and have longer life.
• PPC is more resistant towards the attack of sulphates, alkalies, chlorides and chemicals as compared to OPC.

Which cement is better PPC or OPC?

PPC cement is generally used for plastering, brick masonry and waterproofing works. PPC has a lower heat of hydration and it is prone to fewer cracks compared to OPC. PPC has lower strength than OPC but PPC provides better workability and finishing than OPC. PPC provides greater resistance to chemicals.

Can we use PPC cement for house construction?

Portland pozzolana cement (PPC) is used for the construction of houses, schools, and residential building slabs. PPC is cheaper than ordinary Portland cement. Thus to reduce the building making cost, PPC should be adopted. Both the PPC and OPC cement is used in the construction of slabs.

Is PPC cement good for concrete?

PPC produces highly durable concrete as it has low water permeability compared to OPC. PPC has low initial setting strength compared to OPC but hardens over a period of time with proper curing. And PPC is cheaper also compared to OPC.

Can we use PPC cement for slab?

How do pozzolans work?

Simply put, pozzolans improve concrete by converting problem-causing Calcium Hydroxide (CH)—a by-product of the hydraulic reaction between water and cement powder—to additional Calcium Silicate Hydrate (CSH)—the glue that binds the concrete aggregate.

Where is pozzolan found?

Pozzolana was first found at Puteoli (modern Pozzuoli), near Naples, where there are still extensive beds, and also around Rome. Natural pozzolana is often composed mainly of a fine chocolate-red volcanic earth.