What is PCC and RCC? | Difference b/w PCC and RCC

 PCC AND RCC

What is PCC?

PCC stands for Plain Cement Concrete, commonly known as concrete, is an intimate mixture of binding material, fine aggregate, coarse aggregate, and water. This can be easily moulded to the desired shape and size before it loses plasticity and hardens.

Plain concrete is strong in compression but very weak in tension. The tensile property is introduced in concrete by inducting different materials and this attempt has given rise to RCC, RBC, PSC, FRC, cellular concrete and Ferro cement. In this chapter proportioning, mixing, curing, properties, tests and uses of plain concrete is dealt in detail.

Properties of Concrete

Concrete has completely different properties when it is in the plastic stage and when hardened. Concrete in the plastic stage is also known as green concrete. The properties of green concrete include:

•  Workability
• Segregation
• Bleeding
• Harshness.

The properties of hardened concrete are:

• Strength
• Resistance to wear
• Dimensional changes
• Durability
• Impermeability.

Uses of Concrete

• As bed concrete below column footings, wall footings, on the wall at supports to beams
• As sill concrete
• Over the parapet walls as coping concrete
• For flagging the area around buildings
• For pavements
• For making building blocks.

What is RCC?

Concrete is good in resisting compression but is very weak in resisting tension. Hence reinforcement is provided in the concrete wherever tensile stress is expected.

The best reinforcement is steel since the tensile strength of steel is quite high and the bond between steel and concrete is good. As the elastic modulus of steel is high, for the same extension the force resisted by steel is high compared to concrete.

However, in the tensile zone, hair cracks in concrete are unavoidable. Reinforcements are usually in the form of mild steel or ribbed steel bars of 6 mm to 32 mm in diameter. A cage of reinforcements is prepared as per the design requirements, kept in a formwork and then green concrete is poured.

After the concrete hardens, the formwork is removed. The composite material of steel and concrete now called R.C.C. acts as a structural member and can resist tensile as well as compressive stresses very well.