Prestressed concrete is a type of RCC in which internal stresses are introduced prior to the loading. Concrete used for prestressed work should have a cube strength of 35N/square mm for post tensioned system and 40N/square mm for pre tensioned system. To get the maximum advantage of a prestressed concrete member, it is necessary to use not only high strength concrete but also high tensile strength steel wires.
Shrinkage cracks will be very little in prestressed concrete.
The elastic and creep stains are very small due to high modulus of elasticity of concrete and thus resulting in smaller loss of prestress in the steel.
For providing reinforcement in prestressed concrete, high tensile wires are used which are known as tendons.
Prestressed concrete members also have more resistance to shearing forces. Specially the use of curved cables in long span members help to reduce the shear forces developed at the support sections.
Shrinkage cracks will be very little in prestressed concrete.
The elastic and creep stains are very small due to high modulus of elasticity of concrete and thus resulting in smaller loss of prestress in the steel.
For providing reinforcement in prestressed concrete, high tensile wires are used which are known as tendons.
Prestressed concrete members also have more resistance to shearing forces. Specially the use of curved cables in long span members help to reduce the shear forces developed at the support sections.
No comments:
Post a Comment