Ultimate tensile strength of strand (fp)- 1)12.7 mm: 1860 N/mm2, 2) 15.2 mm: 2650 N/mm2 Torsion constant (a-alpha): refer Krishna raju appendix Grouting required plasticising agent, viscosity agent, gas generating agent, water cement ratio 0.45 i.e. 1 cement= 22 lit water, grout test of 100 mm cube mould at 28 days must be greater than 27 N/mm2 Grouting pressure should not exceed 2 N/mm2. It should be 0.5 N/mm2, air vent pipe should not exceed distance of 15 mtr Effectiveness of grout can be checked by using non-destructive testing like gamma radiography 28 days concrete strength should not fall below 5 % Min cube strength required for post tension is 30 N/mm2 as per IS 1343 Ratio of standard cylinder to the cube strength is 0.8. Min cement content should be 300 to 360 kg/mtr cube for durability. Should not greater than 530 kg/mtr cube. Shrinkage and creep of concrete is due to gradual loss of moisture result in change of volume. Creep is due to externally applied stress and shrinkage is due to without externally applied stress.