Prestressing is a construction method that uses hydraulic jacks to apply precompression to concrete and pretension to high-strength steel wires, utilizing the full strength of both materials to minimize deflection, allow for long spans, reduce member cross-sections and self weight, and provide good structural behavior with an easy and economical foundation design. Expansive cement can also be used for automatic prestressing as it causes length extension after final setting.

2.  Prestressing is a method of applying
precompression to concrete and pretension
to steel wires
 Prestressing Is done by using hydraulic jacks
 In this method high strength steel (1500-
2000 mpa ) and concrete (35-200 mpa) is
used .
 Full material strength of both steel and
concrete is utilised by this method

3.  Deflection is minimised
 Ideal for long spans
 The cross section of members are reduced
due to higher grade materials
 This will results in reduction of self weight of
the structure
 Finally the structural behaviour is good and
and design of foundation is easy and
economical

23.  Expansive cement is used for construction
 The extension in length takes place after
final setting
 The prestressing is done automatically by
this method

24. THANK YOU