7. PRESTRESSED CONCRETE BOX GIRDER

7. PRESTRESSED CONCRETE BOX GIRDER

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CONCRETE

  • Minimum ultimate compressive strength shall not less than 350 ksc. cylinder at 28 days.
  • Minimum transfer strength shall not less than 245 ksc. cylinder.
  • High early strength Portland cement is used and cement content shall not less than 350 kgs. per cubic metre.

 

PC. WIRE

  • PC. 7-Wire strand Ø 3/8” , Ø1/2” (Grade 270 k) are used and minimum breaking strength is about 18,500 ksc.
  • Minimum force transfer to concrete shall not be less than 70% of breaking strength.

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