IRC 37 example check

Enter the traffic, subgrade and trial pavement composition; the pavement is analysed (layered elastic theory, standard axle) and checked to IRC:37-2018 as you type. Thicknesses in mm, moduli in MPa.

Project

Design name

Project

Client

Location

Chainage / section

Checked by

Road and traffic (Cl. 4)

Road category

Carriageway (lateral distribution, Cl. 4.5)

Commercial vehicles per day (two-way, last count)

Traffic in the design direction (%)

Years from count to completion

Annual growth rate (%)

Design period (years)

Vehicle damage factor

VDF

Terrain

Lane width (m)

Reliability (Cl. 3.7)

Subgrade (Cl. 6)

Subgrade modulus from

Soaked CBR of subgrade (%)

CBR of embankment below (%)

Resilient modulus (MPa)

Trial pavement composition (Sections 5, 7 - 9)

Composition

Total bituminous layers (mm)

of which surface course (mm)

Granular base WMM (mm)

Granular sub-base GSB (mm)

Aggregate interlayer (mm)

Cement treated base CTB (mm)

Stabilised RAP base (mm)

Cement treated sub-base CTSB (mm)

Bituminous mix (Cl. 9, Table 9.2)

DBM mix / binder

Average annual pavement temp. (°C)

Tested resilient modulus (MPa) 0 = Table 9.2 value

Air voids Va, bottom DBM (%)

Effective binder Vbe (%)

Interlayer modulus (MPa)

RAP base modulus (MPa)

Granular base over CTSB (MPa)

Cement treated layers (Cl. 7.3, 8.2)

CTB modulus E (MPa)

CTB modulus of rupture (MPa) 20 % of 28-day UCS, max 1.4

7-day modulus of rupture (MPa)

CTSB modulus (MPa)600 (400 for UCS 0.75 - 1.5)

Cumulative fatigue damage of CTB from the axle load spectrum (Eq. 3.6 / 3.7)

Axle load spectrum - expected repetitions in the design period

Construction traffic and design aids

Check GSB / CTB for construction traffic (Cl. 7.2.2, Annex II)

Dumper trips on the GSB

Dumper front / rear tandem axle (kN)

Dumper trips on the CTB

Bituminous thickness trials (charts and least thickness)

Trials from / to (mm)