Civil Bhai

♦️IMPORTANT POINTS- FLEXIBLE PAVEMENT♦️
◾CBR method is applicable only for flexible payment.
◾Depth of construction flexible payment is calculated based on 1)CBR value 2)No of commercial vehicles/day
◾In modified CBR method- modification :-
1)lane distribution factor : it is depend on type of load
2)Vehicle damage factor : it is depend on axel load and type of terrain
◾Equivalency factor :
-it is a damaging factor for different axel load with respect to standard axel load.
-it is used for check the safety of road.



♦️ IMP POINTS- RIGID PAVEMENT ♦️
📌🔹Location of Stresss: at corner(c) , edge(e) and interior(i) part of Pavement
📌🔹Stresses in Pavement :
1) Wheel load stress(WL) 2)Tempreture stress/Warping stress (W)
3) frictional stress(F)
📌🔹 Critical combination of stresses (MPSC 2016)
▪️1) summer mid day :
              WL(e) +W(e) - F
▪️2) winter mid day :
             WL(e) +W(e) +F
▪️3)winter mid night :
             WL(c) +W(c)
📌🔹Joints in Rigid Pavement:
▪️Expansion joint: Dowel bars
▪️Contraction joint: Pavement design RCC bars
▪️Longitudinal joint: Tie bars