What is the critical thickness of a prestressed concrete pavement (using Westergaard’s Corer Load Formula) to support a maximum wheel load of 4200 kg? Allow 10% for impact. Tyre pressure may be taken as 7 kg/cm2. Assume flexural strength of concrete as 50 kg/cm2, factor of safety as 2, subgrade reaction for plastic mix toad as 6 kg/cm, and modulus of elasticity as 3 × 10° kg/cm2.

What is the critical thickness of a prestressed concrete pavement (usi

1.	What is the critical thickness of a prestressed concrete pavement (using Westergaard’s Corer Load Formula) to support a maximum wheel load of 4200 kg? Allow 10% for impact. Tyre pressure may be taken as 7 kg/cm2. Assume flexural strength of concrete as 50 kg/cm2, factor of safety as 2, subgrade reaction for plastic mix toad as 6 kg/cm, and modulus of elasticity as 3 × 10° kg/cm2.
A.	19.6 cm
B.	21.6 cm
C.	23.6 cm
D.	23.8 cm
Answer» B. 21.6 cm