perpetual pavement is one of the new technology in the construction field of roads in these we discussed about how to construct, and what is the step by step process to be followed and advantages and dis advantages of perpetual pavements ,case study also we discussed

2. ◾ Introduction
◾ perpetual pavement concept
◾ Layers of perpetual pavements
◾ Factors affecting pavement selection
◾ Advantages and Disadvantages
◾ Need of perpetual pavements in India
◾ Perpetual pavement inChina
◾ Conclusion

3. ○ Road is the important transportation mode.
○ Perpetual pavement is a special type of pavement.
○ Also called as extended life or long lasting asphalt
pavements.
○ It has about 50 years of life span.

4. Perpetual pavement is an asphalt concrete
pavement that is designed to last 50 years or longer
without any repairs below the wearing course
(surface layer).
» It typically has a multi layered structure which
resists fatigue over time.
» The triple layered structure resists structural
damage for as long as the top surface is maintained
and replaced. 4

5. 5

6. Perpetual pavement uses a thick asphalt
over a strong foundation design with three layers,
each one tailored to resist specific
stresses(TRB,2001):
HMA base layer
Intermediate layer
Wearing surface
6

7. HMAbase layer :
This is the bottom layer designed specially to resist
fatigue cracking.
Two approaches can be used to resist fatigue
cracking in the base layer.
Intermediate layer :
This is the middle layer designed specifically to carry
most of the traffic load.
Therefore it must be stable(able to resist)as well as
durable.
Stability can best be provided by using stone-on-stone
contact in the coarse aggregate and using a binder with
the appropriate high temperature grading. 7

8. WearingSurface :
This is the top layer designed specifically to
resist surface initiated distresses such as top - down
cracking and rutting.
Other specific distresses of concern would
depend upon local experience.
8

9. ◾ Life cycle cost
◾ Availability of quality raw materials
◾ Constructability
◾ Climatic conditions
◾ Sustainability
◾ Durability
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10. ◊ High structural capacity for high traffic volume and
heavy truck loads.
◊ Long life and low cycle cost.
◊ Decreased user cost.
◊ It allows better visual contrast with road lines and
markings.
◊ Provide greater skid resistance.
◊ Economic.
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11. ◊ Initial construction cost is high.
◊ Needs periodic monitoring and maintenance.
◊ Maintenance cost is high.
11

12. → Increase in the number of vehicles in Indian road
imposes distress on the road in the form of increased
fatigue cracking and rutting.
→ Conventional pavements require rehabilitation after 20
years of installation.
→ It will affect the traffic and cost is also high.
→ Perpetual pavements are provided to overcome this.
That will last 50 years without rehabilitation.
→ PP never need to be completely removed and replaced.
Hence it is economical. 12

13. → Only needs surface renewal and base remains the
same. It saves the construction material.
→ Maintenance in the off-peak hours.
→ These results in more cost effective design.
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14. ● China started to construct pp in their province from
the year 2004.
● China build their own pp, that is pavements with
semi-rigid base.
● Most of the high grade
highways are in china
and they have been made
as asphalt pavement with
semi-rigid base.
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15. » Perpetual pavements last for 50 years.
» The initial construction cost is high than
conventional pavements.
» It is the most sustainable pavement designs for
heavy traffic roads.
» The reduction in maintenance results in decrease in
natural resources consumption, energy saving and
pollution reduction. 15

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