What Is RCC Concrete & Properties of RCC Concrete |

What Is RCC Concrete?

RCC’s full form is reinforced cement concrete, which is a composite material made from concrete and steel reinforcement.

As we knew that concrete is weak in tension and strong in compression. Therefore, Steel reinforcement is added to concrete to improve its tensile resistance.

In the civil engineering field, concrete is a material made of Cement, Sand, Mortar, Admixture, etc, and has a different grade based on strength.

As we know that concrete is can resist compression very well, but is very weak in resisting tension. Hence reinforcements are introduced in the concrete wherever higher tensile stress is expected.

When steel is provided in cement concrete it becomes RCC Concrete. The most popular reinforcement is steel.

This is due to the fact that steel has high tensile and bond strength compared to others and also provides strong concrete.

Steel has a high modulus of elasticity so it can resist much more high tensile force for the same amount of extension compared to concrete.

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Types of Reinforcement Used In RCC Concrete

There is various form of steel reinforcement available in the market for construction reinforcement bars, prestressing wires and strands, rolled steel sections and light-gauge steel sections are the major steel forms that are generally used in building construction.

Steel bars have come in many shapes and grades or strengths. These steel bars are of some specified tensile strength, used to reinforce concrete to develop good bond strengths with concrete, and are also used for the fabrication of grills, gates, etc.

The major type of reinforcement steel available in the market is mild steel, tor steel, TMT bars, etc. The following types of bars are commonly used as reinforced concrete steel for construction.

1. Hot Rolled Steel

There are four types of hot-rolled steel in the market.

The first type is mild steel bars (MS bars) are traditionally produced by hot rolling. The bars are hot rolled and form a round shape with a smooth surface. These bars are also called mild steel plain bars.

Mild steel bars come in two grades I and Grade II. Grade I mild steel is slightly higher than that of Grade II. These bars are more resistant to corrosion than tor steel bars.

The hot rolled mild steel ribbed bars are the second type which consists of ribs on them. These ribs help increase the bond strength of the bars.

Steel bars with Rebar or ribbed bars, which are likely to be confused with HYSD bars, are not recommended to use in R.C. works.

The hot rolled high strength ribbed bars are the third type which is produced by hot rolling and got by microalloying which is of high strength.

The Fourth type is HYSD bars; there are hot rolled high yield strength deformed bars. These bars are now replaced by TMT bars.

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2. Cold Twisted Deformed Bars (Tor steel)

Cold Twisted Deformed Bars or Tor steel bars were the first high-strength bars used in India. These bars are first hot rolled in the mill and formed high-grade mild steel with three or more parallel straight ribs on them.

As the projection on steel is like a straight line this steel is easily identified in the field.  Also, they will form a helical around the bars in cold twisting.

This steel is more susceptible to corrosion much quicker than other bars, which are not recommended for use in many advanced countries.

3. TMT bars

TMT stands for Thermo-mechanically Treated Reinforcement Bars are manufactured by sudden quenching of red hot steel bars by a spray of water and can produce steel bars with high strength at the surface with a core of mild steel.

At the end bar structure with tempered martensite on the periphery and a fine-grained ferrite-pearlite structure at the center zone. TMT bars are also manufactured with ribs (rebars) to increase the bond strength of the bars.

TMT corrosion resistance steel (CRS) is also available in the market. The corrosion resistance property of TMT bars is achieved by the addition of corrosion-resistant elements like copper, phosphorus, and chromium.

Compare to Tor Steel the TMT bars are more corrosion resistant and are highly recommended to use in reinforced concrete works.

These bars are manufactured in four grades – Fe 415, Fe 500, Fe 550, and Fe 600.

4. Welded Wire Fabrics

They consist of weldmesh manufactured from medium tensile steel drawn out from diameter mild steel bars. Wires fabrics have higher than that mild steel.

These were fabrics are available in different-width wire rolls, which are very much used in partitions, fencing, etc., and sometimes in R.C. slab construction.

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Properties of RCC

• It should have sufficient compressive strength.
• It should have Adequate tensile strength
• High Fire and weather resistance
• It should be a Durability material.
• Economy to mold any shape
• Low maintenance cost
• The economy as a construction material
• Less deflection
• Use as precast structural components
• Less skilled labor

Uses of RCC Concrete

RCC uses in construction are as follows,

• Reinforcement Concrete forms the major structure of a building structure. All main load-bearing components of the building are made with RCC. For Example Footings, Columns, Beams, Chejjas, roofs, slabs, and Stairs.
• RCC is also used for the construction of storage structures like Water tanks, Dams, Bins, silos, and bunkers.
• It is used for the construction of large infrastructure projects like Bridges, Retaining walls, Docks, and harbors, Underwater structures.
• RCC is also used for precast element casting like Railway sleepers, Electric poles
• It is used for constructing tall structures like Multistory buildings, Chimneys, and Towers.
• RCC is used for Paving Work for Roads, Airports.

Conclusion:

In conclusion reinforced cement concrete is a widely used construction material which combines the strength of concrete and the tensile strength of steel reinforcement, RCC is essential for building bridges, building dams, and foundations.

By utilizing mix proportions, sound construction practices, RCC structure can be constructed to be robust and long lasting.

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