What is RCC ? Why do we R/F Plain Concrete ?
RCC full form is reinforced cement concrete, which is a composite material made from concrete and steel reinforcement. The concrete is weak in tension and strong in compression. Therefore, Steel reinforcement is added in 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.
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Strength : R.C.C. has very good strength
in tension as well as compression.
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Durability : R.C.C. structures are
durable if designed and laid properly. They can last up to 100 years.
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Mouldability : R.C.C. sections can be
given any shape easily by properly designing the formwork. Thus, it is more
suitable for architectural requirements.
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Ductility : The steel reinforcement
imparts ductility to the R.C.C. structures.
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Economy : R.C.C. is cheaper as compared
to steel and prestressed concrete. There is an overall economy by using R.C.C.
because its maintenance cost is low.
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Transportation : The raw materials which
are required for R.C.C. i.e., cement, sand aggregate, water and steel are
easily available and can be transported easily. Nowadays Ready Mix Concrete
(RMC) is used for faster and better construction. (RMC is the concrete which is
manufactured in the factory and transported to the site in green or plastic
state).
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Fire Resistance : R.C.C. structures are
more fire resistant than other commonly used construction materials like steel
and wood.
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Permeability : R.C.C. is almost
impermeable to moisture.
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Seismic Resistance : Properly designed
R.C.C. structures are extremely resistant to earthquakes.
What are the factors affecting on which composite action of steel and concrete in RCC ?
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The composite action of steel and
concrete in a reinforced concrete section is dependent on the following
important factors :
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The bond between steel and concrete.
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Prevention of corrosion of steel bars
embedded in the concrete.
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Practically equal thermal expansion of both
concrete and steel.
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