What Is RCC

Reinforced Cement Concrete

Everything You Need To Know About RCC Structure

What Is Reinforced Cement Concrete ?

The term RCC stands for reinforced cement concrete. It is one of the most commonly used versatile construction material used in the construction industry.

The RCC structures are the most durable, economical, versatile and long lasting construction material. The RCC is suitable for all types of buildings and infrastructure projects.

The RCC is a composite materiel prepared from concrete and the steel. The concrete is prepared by mixing cement, sand, course aggregates and water in the specified proportion.

The reinforcement used in the RCC consist of hot rolled deformed bars ( HRDB ) and mild steel bars.  The hot rolled deformed bars are used for the main reinforced and the mild steel stirrups ( rings ) are used as sheer reinforcement.

The RCC is a highly durable material that offers excellent compressive and tensile strength. It also offers some major advantages over other traditional materials such as wood and steel.

What Is Reinforced Cement Concrete

The RCC is the most versatile construction material extensively used for different types of structural components. The RCC structural members include foundations, column footings, slabs, columns, beams, fins and other structures.

In this section, we will study RCC – reinforced cement concrete as a construction material, properties of RCC, advantages and disadvantages of RCC structures, design methodology.

Civil Engineering Basic Knowledge

Fundamentals Of RCC Construction

Table Of Contents

This section covers the basics of RCC – Reinforced Cement Concrete structures, properties, advantages and disadvantages of RCC.

Ingredients Of The Reinforced Cement Concrete

The RCC is prepared with two basic ingredients. The RCC is a composite product made up of concrete and the reinforcement. The most commonly used reinforcement in the RCC work is steel bars.

The concrete is a mixture of cement, fine aggregates ( sand ), coarse aggregates ( crushed stone ) and water mixed together in the prescribed proportion as per the grade of the concrete.

The steel reinforcement consists of steel rods of the specific grade. The hot rolled deformed bars are used as main reinforcement. Whereas, the mild steel reinforcement is used as sheer and distribution reinforcement.

RCC Structure, Reinforced Cement Concrete

The water used for the concrete mix must clean and free from any chemical impurities. The water that conforms to the potable standard is considered to be safe for the RCC works. The water contamination can adversely affect the RCC strength.

The RCC structural design defines the grade of the concrete and the steel reinforcement to be used. The structural drawing is a part of the construction drawing set.

The use of readymade concrete is extensively used for all types of reinforced cement concrete RCC projects. The readymade concrete is produced under highly controlled conditions that conforms to the specified quality standards.

Reinforced Cement Concrete - RCC

Advantages Of RCC Structures

The reinforced cement concrete offer some major advantages as compared to other construction materials. 

  • The RCC offers excellent durability.
  • The RCC structure can be molded into any shape.
  • The RCC structures are economical.
  • The RCC structures requires low maintenance.
  • The RCC structure is water resistant.
  • The RCC structure can handle both compression and tension.
  • The RCC is fire resistant.
  • The RCC is frost resistant.
  • The RCC structures are easy to construct.
Foundation In Civil Engineering
Curing Of Cement

Disadvantages Of RCC Structures

  • The RCC structures are heavy.
  • The RCC structure needs formwork.
  • The RCC structure needs to be cured.
  • The RCC structures can be used only after gaining full strength.
  • The RCC structure cannot change its shape.
  • The RCC structures requires skilled supervision.

Reinforced Cement Concrete - RCC

RCC Structure Design Basics

Different types of steel reinforcement bars and grades of concrete mix are used in the RCC work. The placement of the steel reinforcement into the RCC construction and the grade of the concrete mix depends upon the structural design.

The structural design is set of documents in addition to the construction drawing prepared by an architect. Whereas, the structural design is prepared by the licensed structural engineer.

The structural design of the building is a set of structural drawing that provides all the necessary information about the design details for each structural member.

Structural Design Drawing ,Reinforced Cement Concrete

The structural drawing provides the details of the placement of the reinforcement, type, size and the grade of the steel reinforcement bars. It also specifies the type and the grade of the concrete to be used.

The structural components such as column footings, slabs, columns and beams are required to be designed for both compressive as well as tensile strength.

Reinforced Cement Concrete - RCC

Properties Of RCC Structure

The reinforced cement concrete  include following properties. 

  • The RCC has excellent compressive strength.
  • The RCC has excellent tensile strength.
  • The RCC structure has some ductile.
  • The RCC structure is impermeable.
  • The RCC structure has low coefficient of expansion.
  • The RCC structure is not affected underwater.
  • Generates heat of hydration.

What Is Reinforcement ?

The plain cement concrete ( PCC )  provides excellent load bearing capacity in terms of its compressive strength. However, the plain cement concrete is not considered very good in the tensile and the ductile strength.

And therefore, in order to improve the tensile strength of the concrete, an additional layer material called reinforcement is placed inside the concrete to handle the tensile stress. This composite concrete is called the reinforced cement concrete ( RCC ).

Different types of reinforced cement concrete are used in the construction industry. However, the steel reinforcement is the most widely used reinforcement material in the RCC work.

Reinforcement In RCC Slab

Grades Of The Steel Reinforcement

Different types of reinforced cement concrete are used in the construction industry. However, the steel reinforcement is the most widely used reinforcement material in the RCC work.

Different grades of steel can be used as a reinforcement for RCC structural work. The grade of the steel defines the tensile strength and other properties.

The American standard for the steel reinforcement is specified in ASTM A 488.  The European standard for the steel reinforcement is specified in IDN 488.

The British standard for the steel reinforcement is specified in BS4449 – 1997.  The Indian standard for the steel reinforcement is specified in IS 1786.  

American Standard 

European Standard 

British Standard 

Indian Standard 

ASTM A 615

IDN 488

BS 4449 - 1997

IS 1786

Grade 75 ( 520 )

BST 500 S

GR 460 A

Grade Fe – 415, Fe – 500, Fe – 500D

Grade 80 ( 550 )

BST 500 M

GR 460 B

Grade Fe – 550

Reinforced Cement Concrete - RCC

Placement Of Reinforcement

In order to construct a RCC structural member, a temporary mold is created as per the structural dimensions specified in the structural drawing. This temporary mold is called a formwork.

Different types of formworks are used in the construction industry to cast the RCC structural members such as column footings, columns, beams, retaining walls and slabs.

A formwork is essential for the construction of the RCC structural work. After erecting the formwork, the steel reinforcement is placed inside the formwork as per the structural design.

Casting Of RCC Work , Reinforced Cement Concrete

The steel reinforcement rib is firmly secured in place with the help of cover blocks and the chair bars. The steel chair bars are specially designed to hold the reinforcement bars in place.

The final step is to pour the concrete into the formwork. The mechanical vibrators are used to compact the concrete mass. The compaction removes the air pockets and allows the concrete to flow easily into the formwork mold.

Reinforced Cement Concrete - RCC

Types Of Reinforced Cement Concrete

Different types of reinforced cement concrete are used in the construction industry for different applications.

  • Glass Fiber Reinforced Concrete ( GFRC )
  • Steel Fiber Reinforced Concrete ( SFRC )
  • Natural Fiber Reinforced Concrete ( NFRC )
  • Polypropylene Fiber Reinforced Concrete ( PFRC )
  • Engineered Cementitious Composite ( ECC )

The Chair And Cover In RCC

The reinforcement bars placed in the concrete are embedded into the concrete and should not be exposed. The reinforcement if it gets exposed can corrode adversely affecting the strength of the structural member.

In order to protect the steel reinforcement bars from the exposure, the cover blocks are placed at all the places ( side and bottom surface of the formwork ).

The correct placement of the cover blocks ensures that the reinforcement is not exposed to the outside during the casting of the RCC structures.   

Steel Reinforcement Chairs

Reinforced Cement Concrete - RCC

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