Concrete overlay on pavements

2. Presentation Outline
 Introduction
 Research Gap
 Literature Review
 Methodology
 Data Analysis
Conclusions
Future Scope
References
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3. INTRODUCTION
• According to IRC:SP:17-2019 (Draft Copy) “Concrete overlay is
the wearing and stress bearing top layer of Pavement Quality Concrete
(PQC), laid on an existing pavement with or without intermediate base
or subbase (interlayer), to resurface, restore and strengthen the existing
pavement.”
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Source: Guide to concrete
overlays, Iowa State
University, NCPTC.

4. INTRODUCTION CONTD…….
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Without the
overlay
With the
overlay
COST VS DESIGN LIFE
construction cost Maintenance cost
Source: Report on reformulated pavement service life
given by FHWA
Effect of overlay on structural capacity of
the pavement with time
With the overlay there is considerable
reduction in maintenance cost
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5. Methodology In Abaqus
Pavement without
overlay at initial
condition
Pavement without
overlay subjected
to design period
Pavement with
overlays
PQC
thickness 200
mm
PQC
thickness 225
mm
PQC
thickness 250
mm
PQC
thickness 275
mm
PQC
thickness 300
mm
Overlay thickness of 50
mm
Overlay thickness of 75
mm
Overlay thickness of 100
mm
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Pavement with
unbonded overlay
(coefficient of
friction)
Pavement with
bonded overlay
(rough contact)