PPC and OPC cement

17 Major Difference Between OPC and PPC Cement

The purpose of this post is to clarify the major difference between OPC and PPC cement. (Ordinary  Portland Cement) and PPC (Pozzolana Portland Cement).

The Portland Pozzolana Cement (PPC) is a variant of the OPC (Ordinary Portland Cement). These two types of cement differ in terms of their components, strength, heat generation, amount of each component, durability, grades, cost, eco-friendly nature, setting time, curing time, etc. Below, you can read about the major differences between OPC and PPC. Before we start, let’s catch up on the basics of PPC and OPC cement.

What is PPC Cement 

Pozzolana is a natural or artificial material containing silica in its reactive form. By mixing pozzolanic materials with Portland cement, Portland Pozzolana Cement is manufactured. Various proportions of OPC clinker, gypsum, and pozzolanic materials are present in this cement. Fly ash, volcanic ash, clay or silica fumes are all Pozzolanic materials. These materials are added to cement in an amount ranging from 15% to 35%.

What is OPC Cement?

Ordinary Portland Cement (OPC) is made from grinding limestone into a powder with other raw materials such as argillaceous, calcareous, and gypsum. There are three types of grades of OPC cement: OPC 33, OPC 43, and OPC 53. OPC is the world’s most widely used cement. It is typically used in fast-paced construction projects. Making OPC has significantly decreased due to the advantages of PPC such as reduced energy consumption, lower environmental pollution, and increased economy.

Now we will talk about the Different Grades for OPC and PPC cement.

Different Grades for OPC and PPC cement

Now we will talk about the Different Grades for OPC and PPC cement.

According to the Bureau of Indian Standards (BIS), there are different Grades for OPC and PPC cement is available.

OPC is available in three grades: 33, 43, and 53.

When high grades of concrete are required, such as M-20 and above, 33 grade is usually not chosen because of its weak compressive strength.

43 grade is widely used for a variety of applications. The construction industry uses this grade extensively.

 The 53 grade is strong enough to match the demands of very strong concrete. Chemically, OPC 33, OPC 43 and OPC 53 grades are the same, but higher-grade cements are much stronger and longer-lasting. According to BIS, PPC has the same compression strength as OPC 33 grade at present.

Difference Between OPC and PPC Cement

The main differences Between OPC and PPC Cement in their characteristics and uses are –

DescriptionOPC (Ordinary  Portland Cement)PPC (Pozzolana Portland Cement)
DefinitionThe word OPC stands for Ordinary Portland Cement. OPC is obtained by mixing limestone with other raw materials like argillaceous, calcareous, and gypsum, then grinding them together.
To prepare PPC, add Pozzolanic materials to OPC. The main components are OPC clinker, gypsum, fly ash, and pozzolanic materials (15-35%), which are composed of calcined clay, volcanic ash, volcanic ash, and silica fumes.
CompositionOPC contains a large amount of limestone powder.Pozzolana is made by volcanic eruptions. Clay accounts for about 80% of this siliceous material.
Raw MaterialNormally, Portland cement is made up of raw argillaceous, calcareous and gypsum materials.To manufacture pozzolana cement, 30% pozzolana is mixed into ordinary Portland cement clinkers.
DurabilityThe durability of concrete made by OPC is less when compared with PPC.The main goal of adding pozzolana materials to concrete is to make it more durable.
Initial StrengthInitial strength is greater than PPC.Over a longer period of time, PPC has a higher strength than OPC.
GradesOn the market, three grades of cement are available: OPC33, OPC43, and OPC53.PPC has no such grades, it is the same strength as OPC33. It is differentiated by the types of pozzolanic material added to OPC. There are three types of pozzolanic material: fly ash, volcanic tuff, and rice husk ash.
Heat of HydrationAfter mixing with water, OPC generates more heat, which makes it unsuitable for mass casting.Compared to other processes, PPC has a slower hydration process, which results in less heat generation.
Environmental ImpactDuring manufacturing, it emits CO2.Due to its composition of both natural and industrial waste, it is eco-friendly.
CostThe cost of OPC is higher than that of PPC.The PPC price is less, so construction is more affordable.
Permeability and FinenessLower the fineness , higher the permeability. The fineness of OPC is 225m2/kg.With a fineness of 300m2/Kg, PPC can be more durable with a lower permeability.
Workability of ConcreteWith OPC, good workability is possible, but it is less than PPC.The workability of concrete made with PPC is better than that of concrete made with OPC.
Volume of MortarWhen compared to PPC, OPC achieves a lower volume of mortar due to its finer properties.Compared to OPC, PPC produces a higher volume of mortar because of its lower density.
Curing periodThe minimum curing period prescribed by IS 456:2000 is not less than 7 days when exposed to extreme weather conditions, but not less than 10 days.As per IS 456:2000, in order for blended cement (PPC) to attain full hardness, the minimum curing period must not exceed 10 days. For hot conditions, the curing period must be at least 14 days.
Resistance to chemical attacksChlorides and sulfates are less resistant to Ordinary Portland cementPPC has high resistance to chlorides, sulfates, etc.
Setting timeThe initial setting time of OPC is 30 minutes and the final setting time is 600 minutesThe initial setting time of PPC is 30 minutes, and the final setting time of PPC is 600 minutes.
FinenessFineness of OPC is 225 sq.m/kg. This is less fine than PPC. Because of its higher permeability, its durability is lower.The fineness of OPC is 300 sq.m/kg. It is better than OPC. This results in a higher durability due to its lower permeability.
Uses and applicationsAs mentioned above, it is suitable for construction where speed is required. However, it is not suitable for mass concreting because of the heat issue.You can use it for any type of construction project. For example, RCC casting for buildings, mass concrete construction for bridges, and even plastering and other nonstructural works.

These are the some of the major Difference Between OPC and PPC Cement

Which grade of cement is better, grade 43 or grade 53?

In terms of strength, grade 43 and grade 53 cement indicate the strongest strength attained after 28 days. There are two grades of cement that are most commonly used and their differences are –

  • The strength of Grade 53 cement is 530kg/sq.cm. after 28 days, whereas Grade 43 cement is 430kg/sq. cm. after 28 days.
  • Construction projects like bridges, roads, multistory buildings, and cold weather concrete require Grade 53 cement. Grade 43 cement is the most widely used cement for general construction.
  • Cement of grade 53 reaches high strengths very quickly and sets in a very short time. After 28 days, it doesn’t gain much strength. Initial strength of Grade 43 cement is low, but its strength increases with time.
  • A cement of Grade 53 sets quickly and releases higher heat of hydration, while a cement of Grade 43 releases very little heat of hydration. Consequently, micro-cracks can form in Grade 53 Cement and proper curing is necessary to prevent them.
  • A grade 53 cement is a little more expensive than a grade 43 cement.

Use of OPC and PPC Cement

With its many applications in the construction industry, PPC is considered to be a future product. It can withstand harsh environmental conditions. As masonry mortar and plastering, hydraulic structures, and marine structures, they can be reliably used in construction.

They are also commonly used in mass concrete works, such as dykes, sewage pipes, and dams. They are used in many of the same applications as OPC. Despite this, OPC is still the most common cement used worldwide. The low cost of production makes it the most sought after cement in the construction industry.

A variety of structures, including high-rise buildings, roads, dams, bridges, and flyovers, are constructed using them. OPC is also used to make mortars and grouts. The material is ideal for the construction of industrial and residential complexes. These are some of the uses of the OPC and PPC cement

Final words(Difference Between OPC and PPC Cement)

PPC and OPC are both common cements used in construction. Nowadays, PPC takes the place of OPC. In PPC, a pozzolanic material is added to the concrete mix that helps to enhance its strength. Making concrete with PPC also reduces the use of OPC. In addition, it is a sustainable building material. As a result of these factors, PPC is slightly better than OPC. However, a definitive conclusion cannot be made.

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