Page 34 - UNIT 5- FLEXIBLE PAVEMENT DESIGN

Civil Engineering Department | DCC3113 : Highway & Traffic Engineering

Design Procedure:

Define equivalent thickness, TA’ using Nomograph Thickness

Based on subgrade CBR, ESA and TA values (Using Figure 2)

In case of varying CBR for 1m depth of sub-grade, mean CBR is determined as follows:

CBR = [(h CBR 1/3 + h CBR 1/3 + … + h CBR 1/3 ) / (1000)]
3
1
m
n
2
n
1
2

Where:
CBR = mean CBR for that location
m
CBR1, CBR2, … CBR = CBR of soil strata
n
h , h , … h = thickness of soil strata (mm)
n
1
2
h + h + … + h = 1000 mm
n
1
2

Make sure TA ≥ TA’

Sketch the designed thickness

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Prepared by : SITI ZURAIFA BINTI MD SAH, zuraifa@pmu.edu.my