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RCC(Reinforced Cement Concrete)

PLAIN AND REINFORCED CONCRETE

Reinforced Cement Concrete

Plain concrete:

 It is a mixture of sand, gravel, cement, and water which results in a solid mass. Concrete is strong in compression but weak in tension. Its tensile strength is approx, one-tenth of compressive strength. Plain concrete is mostly used in mass concrete work. (As in dams).


Reinforced Concrete:

  • It is concrete with reinforcement embedded in it. The embedded reinforcement makes it capable of resisting tension also.
  • Steel bars embedded in the tension zone of concrete relieve concrete of any tension and take all tension without separating from concrete. 

  • The bond between steel and surrounding concrete ensures strain compatibility i.e., the strain at any point in the steel is equal to that in the adjoining concrete.
  • Reinforcing steel imparts ductility to concrete which is an otherwise brittle material.
  •  Here ductility means large deflection owing to yielding of steel, thereby giving ample warning of impending collapse.
  • Tensile stress in concrete arises on account of direct tension, flexural tension, diagonal tension (due to shear), temperature and shrinkage effect, restraint to deformation.
  • Under these conditions, reinforcements must be provided across the potential tensile cracks.


COMPRESSIVE STRENGTH OF CONCRETE

  • The compressive strength of concrete is the most important property of concrete. Because other properties like stress-strain relationship, tensile strength, shear strength, bond strength, modulus of elasticity, density, impermeability, durability, etc. can be inferred from the compressive strength using established correlations.
  • Compressive strength can be measured by standard tests on concrete cube (or cylinder) specimens.
  • The strength of concrete in uniaxial compression is determined by loading a standard test cube (150 mm size) to failure in a compression testing machine.

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