## Introduction of Cement

Cement is one of the mos**t important engineering construction materials**. It is widely used in the **construction of various Structures**.

It is the **key ingredient of the concrete**. Concrete is made by **mixing sand, aggregate, and cement along with water in the fixed proportion**. The Strength of the** Concrete is mainly achieved by the Cemen**t.

In this article, you will get to know about different grades of cement, their properties, and uses.

## Introduction of **OPC**

OPC is one of the most important** types and widely used cement in the Construction Industry**. **OPC Cement full form Ordinary Portland cement.**

Ordinary Portland cement (OPC) is the** commonly used cement around the world as a basic ingredient of concrete, mortar, stucco, and non-specialty grout.**

The Ordinary Portland Cement is mainly c**ategorized into three types, which are 33-Grade Cement, 43-Grade Cement, and 53-Grade Cement.**

This grade of cement is **classified depending upon the compressive strength of the cement,** which is tested after 28 days.

**Compressive Strength of Cement =( Apply Load / Unit Area)**

The unit of compressive strength is** N/mm ^{2}**

## Which Grade Cement Is Used for Slab

Ordinary Portland cement of **53 Grade** is suitable for all **types of RCC structures** and is mainly used for the **construction of slabs**.

Because in the **Construction of slabs, initial and ultimate strength is the major structural requirement.**

The **53 Grade Cement is highly preferred for the construction** of the **structures which require high strength such as the construction of high rise building and bridges.**

## Types of Cement Grades

There are **different grades of cement,** which are specified by **IS 1489: 1991 as** below of **cement grade list.**

**• OPC 33 Grade Cement**

**•** **OPC 43 Grade Cement**

**• OPC 53 Grade cement**

**OPC (Ordinary Portland Cement) 33 Grade Cement**

**•** The Cement, which has **Compressive strength of 33 N/ mm ^{2}** after the 28 days when tested, is known as

**33-Grade Cement.**

**•** Fineness (specific area) of **33 Grade Cement** =** 300 m ^{2}/kg**

**•** **3 days compressive strength** =** 16 N/mm ^{2}**

**• 7 days compressive strength = 22 N/mm ^{2}**

**• 28 days compressive strength = 33 N/mm ^{2}**

**Properties of 33-Grade Cement**

**• **This grade of **cement has high workability and is mainly used for masonry work and for plastering work**.

**• **The initial strength of **33 Grade Cement continues to gain even after 28 days**.

**• **The heat of hydration of **33 Grade Cement is lower as compared to the 43 grade and 53-grade cement.**

**Uses of 33-Grade Cement**

**• **It is widely **used in plastering work**.

**• **It is also** used for the brickwork of walls**.

**• **In the **tiling work**.

**• **It is generally used for work, which required low **compressive strength of below M20.**

The Code of reference for** 33-grade cement is IS Code – IS 269: 1989**.

**OPC (Ordinary Portland Cement) 43 Grade Cement**

**• **The Cement, which has **Compressive strength of 43 N/ mm ^{2 }**after the 28 days when tested, is known as

**43-Grade Cement.**

**• **Fineness (specific area) of **43 Grade Cement = 225 m ^{2}/kg**

**• 3 days compressive strength = 23 N/mm ^{2}**

**• 7 days compressive strength = 33 N/mm ^{2}**

**• 28 days compressive strength = 43 N/mm ^{2}**

**Properties of 43-Gradee Cement**

**• **It has **low chloride content,** so it **doesn’t cause corrosion of steel reinforcement**.

**• **It gives **good workability of concrete.**

**• **The initial** strength of 43 Grade Cement continues to gain even after 28 days**.

**• **The **heat of hydration of 43 Grade Cement is medium**.

**• **This will give a **better surface finish to the structures.**

It is **moderately sulfate resisting.**

**Uses of ****43 ****Grade Cement**

**• **It is **used in the preparation of Ready Mix Concrete (RMC).**

**• **It is** used for PCC and RCC work.**

**• **It is used in the** construction of RCC bridges.**

**• **For **Construction of Silos and Chimneys.**

**• **It is used for finishing of all **types of structures like buildings, bridges, roads, and water retaining** structures.

**• **It is used in **precast and prestressed concrete.**

**• **It is also **used in Ship form Construction.**

**• **It is used in the** construction where a grade of concrete up to M30.**

The Code of reference for **43-Grade Cement is IS Code – IS 8112: 1989.**

**OPC (Ordinary Portland Cement) 53 Grade Cement**

**• **The Cement, which has **Compressive strength of 53 N/ mm ^{2}** after the 28 days when tested, is known as

**53-Grade Cement.**

**•**** **Fineness (specific area) of **53 Grade Cement = 225 m ^{2}/kg**

**• 3 days compressive strength = 27 N/mm ^{2}**

**• 7 days compressive strength = 37 N/mm ^{2}**

**• 28 days compressive strength = 53 N/mm ^{2}**

**Properties of 53 Grade Cement**

**• **It is a **Sulphate resisting cement.**

**• **It has** low chloride content.**

**• **It can be **used in speedy Construction.**

**• **It **saves shuttering cost due to early removal.**

**• **The initial **strength of 53 Grade Cement continues to gain even after 28 days.**

**Uses of 53 Grade Cement**

**• **It is used the **construction of concrete sleepers for Railways.**

**• **It is used in **pre-stressed girders.**

**• **The** 53-Grade Cement achieves early strength**.

**• **It is used in** industrial buildings roads and runways.**

**• **It is used in the** construction of RCC bridges and precast concrete.**

**• **Generally used for **M25 and above concretes.**

**• **It is used in the construction of all **RCC components like a beam, columns, footings, and slabs.**

The Code of reference for **53-Grade Cement is IS Code – IS 12269: 1987.**

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