This document summarizes the design process for concrete pavements according to IRC-58:2012. It includes steps such as selecting a trial thickness, determining the modulus of subgrade reaction, providing granular and DLC subbases, calculating the flexural strength of concrete, performing traffic analysis, analyzing bottom-up and top-down cracking, applying equations for relative stiffness and checking the critical distress factor. The design is considered safe if the critical distress factor is less than 1 and needs redesign if it is greater than 1. References are also provided.

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Design of cc pavement
according to IRC-58:2012
P a v e m e n t D e s i g n
Bhavya S. Jaiswal
Btech civil, Mtech Transportation
Engineering

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Design of cc pavement
according to IRC-58:2012
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1. Make a typical cross section of the rigid pavement :
PQC
Separation Layer
DLC/Cement
Drainage Layer
Sub Grade
Prepared by: Bhavya S. Jaiswal

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Design of cc pavement
according to IRC-58:2012
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2. Take a trial thickness as 0.25m to 0.30m
3. According to the CBR% given, find the modulus of the subgrade reaction from
Pg:9, Table:2
4. Provide 100mm or 150mm thick granular sub-base ; however, the 150mm
thick base in generally preferred.
5. Provide DLC subbase of thickness 150mm with a minimum 7-day with the
compressive strength of 7mPa.
6. Find effective modulus of subgrade reaction for combined foundation of
subgrade + granular & DLC subbase according to Pg:12, Table:4
7. Provide a bonding layer of polyethene sheet of 125micron thickness between
DLC and slab.
Prepared by: Bhavya S. Jaiswal

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Design of cc pavement
according to IRC-58:2012
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Selection of flexural strength of the concrete:
• 28-day flexural strength of cc = 4.5 mPa (minimum)
• 90-day flexural strength of cc = 4.5×1.1 = 4.95 mPa
Traffic analysis :
𝐶 = 365 [
𝑇𝑟𝑎𝑓𝑓𝑖𝑐×(1+𝑟)𝑛
𝑟
]
Where,
Traffic = given traffic× 2 (for 2 direction; CVPD)
r = rate of growth of traffic
n = design life (years)
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Design of cc pavement
according to IRC-58:2012
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Various Traffic volume values in MSA:
1) Total 2-way axle load during design period = C×Avg. No. of axle given
2) Number of axle in predominant direction = (1) × 0.5 (if 2lane, 0.25 if 4 lane)
3) Night time 12hrs design axle repetition = (2) × given night traffic %
4) Day time 12hrs design axle repetition = (2) × (1-given night traffic)%
5) Day time 6hrs repetition = (4)÷2
6) The Bottom up cracking = (5)
7) Night time 6hrs repetition =
(3)
2
×% of vehicle travelling during night time
8) The top down cracking = (7)
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Design of cc pavement
according to IRC-58:2012
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• Make a table for BUC and TDC according to the given proportion for various
axle categories; as an example…
Axle category Proportion Bottom up crack Top down crack
Front single 0.50 (6) × 0.50 (8)× 0.50
Rear single 0.10 (6) × 0.10 (8)× 0.10
Rear tandem 0.20 (6) × 0.20 (8)× 0.20
Rear tridem 0.20 (6) × 0.20 (8)× 0.20
Than go for the analysis of Top-down and Bottom-up cracking
Prepared by: Bhavya S. Jaiswal

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Design of cc pavement
according to IRC-58:2012
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Apply the equation of relative
stiffness as…
𝑙 =
4 𝜖 × ℎ3
12 × 𝑘(1 − 𝜇2)
Where,
𝑘= effective modulus of subgrade
𝜖= elastic modulus of concrete ; 30,000mPa
𝜇= Poisson's ratio
ℎ= Trial thickness
And take,
𝛾 = unit weight of concrete, 24KN
Temperature differential for day = Pg:7,
Table:1
Temperature differential for night =
𝐷𝑎𝑦
2
+ 5
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Design of cc pavement
according to IRC-58:2012
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Assume the Beta factor as 0.66 if it is not given and find out all the
values of CFD and the if the CFD<1 than the design is SAFE !! And
if CFD>1 than the pavement is to be REDESIGNED !!
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References
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• IRC-58:2012
• The constructor : https://theconstructor.org/practical-guide/tie-bar-
constructions/37378/
• Engineerwing : https://www.engineerwing.com/2017/05/types-of-
concrete-pavement-uses.html
• Dowel bars : pavement interactive;
https://pavementinteractive.org/reference-desk/pavement-types-
and-history/pavement-types/dowel-bar/
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