Mix design of high strength concrete is influenced by properties of cement, sand aggregates & water-cement ratio have compressive strength above 40 MPa. To achieve high strength, it is necessary to use lowest possible water-cement ratio, which invariably affects the ...
Prestressed Concrete
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MEASURING LOSS OF PRESTRESS IN PRESTRESSED CONCRETE
Instruments for measuring loss of prestress in prestressed concrete: The initial pre-stressing force applied to the concrete element reduces due to elastic shortening of the concrete, anchorage losses, frictional losses etc. The pre-stressing force further reduces with the passage of ...
Prestressed Concrete Pipes – Types, Uses and Manufacture
Prestressed concrete pipes are widely used around the world and slowly replacing RCC pipes and steel pipes. They have more strength than RCC pipes and economical compared to steel or cast iron pipes. The strength of PSC pipe can be ...
Specifications of Prestressing Steel in Prestressed Concrete
Specifications of Prestressing Steel in Prestressed Concrete For prestressed concrete members, the high-tensile steel, used generally, consists of wires, bars or strands. The high tensile strength of steel is generally achieved by marginally increasing the carbon content in steel in ...
Prestressed Concrete Mix Design Proportions
Prestressed Concrete mix design proportions should be chosen in such a way that strength, durability, workability etc suits the construction. The mix proportions for prestressed concrete are determined based on the recommendations provided by the standard codes of the region. ...
Requirements of Prestressed Concrete
Strength and durability are the basic requirements of prestressed concrete. The prestressing levels are determined such a way that the structural member show desired performance safely and economically. Main requirements of prestressed concrete are explained in the below section. Requirements ...
Prestressed Concrete Design – Concept
LOSS OF PRE-STRESS
A reduction in initial pre-stress resulting from the combined effect of creep, shrinkage or elastic shortening of the concrete, relaxation of the reinforcing steel, frictional losses resulting from the curvature of the draped tendons and slippage at the anchorage. (more…)
Prestressed Concrete- Advantages and Disadvantages
Prestressed concrete is the most durable, reliable and strongest concrete that is widely used for the construction of mega buildings and bridges. It is a type of concrete in which high-strength tendons placed in tension regions of the cross-section are ...