Road Pavement Thickness (CBR Method)
Roads IRC 37:2018~2 min
Determine flexible pavement thickness using CBR method as per IRC 37:2018.
Formula
Total thickness from IRC 37 design charts based on CBR and traffic
Input Parameters
Million Standard Axles
Results
Total Pavement Thickness
535mm
Granular Sub-Base (GSB)
187mm
Water Bound Macadam (WBM)
161mm
Binder Course (DBM)
107mm
Wearing Course (BC)
80mm
Step-by-Step Method
- 1Determine subgrade CBR from field/lab tests.
- 2Estimate design traffic in MSA.
- 3Use IRC 37 design charts to get total pavement thickness.
- 4Distribute thickness among GSB, WBM, binder, and wearing courses.
Engineering Notes
- •Minimum CBR for subgrade = 2%.
- •Minimum wearing course = 25 mm BC.
- •This is an approximate method; use IRC 37 charts for final design.
Code Reference
IRC 37:2018
People Also Use
Need Expert Design?
Our engineers can handle the full structural design for your project.
Get a Free QuoteMore Calculators
View All🏗️Concrete Volume CalculatorConcrete🏗️Concrete Mix Design (IS Method)Concrete🏗️Cement Quantity CalculatorConcrete🏗️Water-Cement Ratio CalculatorConcrete⚙️Rebar / Steel Bar Weight CalculatorSteel⚙️Structural Steel Section WeightSteel⚙️Steel Column Axial CapacitySteel🏛️RCC Beam Design (Singly Reinforced)Structural🏛️RCC One-Way Slab DesignStructural🏛️RCC Column Design (Axial Load)Structural🏛️Shear Reinforcement DesignStructural🌍Isolated Footing DesignGeotechnical