Phase A: Subgrade Analysis

Calculate effective subgrade properties using IRC:37-2018 guidelines

Design Traffic

Cumulative 80 kN standard axles during design life
Typically 15-20 years for flexible pavements (IRC:37-2018)
Higher reliability for expressways/important roads

Effective Subgrade CBR

Clause 6.4
Enter known effective CBR value directly

Live Results

Ready
Effective CBR
--
%
Subgrade Modulus (MRs)
--
MPa

Enter CBR to calculate MRs

Note (Clause 6.4): Maximum MRs is capped at 100 MPa as per IRC:37-2018 for design purposes.

IRC:37-2018 Formulas

Clause 6.3
MRs = 10 × CBR
for CBR ≤ 5%
(Eq. 6.1)
MRs = 17.6 × CBR0.64
for CBR > 5%
(Eq. 6.2)
Clause 6.4: Effective MRs shall not exceed 100 MPa for design.

Phase B: Pavement Composition

Select pavement type and configure material properties

Pavement Type Selection

Bituminous Mix Properties

For Fatigue Calculation
Default: 3.5% (Single DBM)
Default: 11.5%

Layer Structure

Preview
Select a pavement type to see layer structure

Layer Configuration

Define thickness for each pavement layer

Layer Thickness Input

Layer Material Thickness (mm) MR (MPa) Poisson's Ratio (μ)

Pavement Cross-Section

Technical Drawing
εt Analysis Point
εv Analysis Point
Geogrid Reinforcement

Phase C: Design Verification

Verify design against fatigue and rutting criteria

IIT-PAVE Analysis - Design Configuration

Terminal Style
IIT-PAVE Input
No. of Layers: --
Layer Material E (MPa) μ h (mm)
Wheel Configuration (Dual Wheel for Pavement Analysis)
Wheel Type: Dual
Tyre Pressure (p): 0.56 MPa
Wheel Load (P): 20,000 N (each wheel)
Contact Radius (a): 106.6 mm
Dual Wheel Spacing: 310 mm (center to center)
Analysis Points (4 Points)

IIT-PAVE Output - Computed Strains

From bottom of bituminous layer
From top of subgrade

Attach IIT-PAVE Screenshot (Optional)

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Maximum Allowable Strains

80% Reliability
Fatigue Cracking (εt)
--
με
Subgrade Rutting (εv)
--
με

Design Report

Complete flexible pavement design report as per IRC:37-2018