perpetual pavement .pptx

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

1. Introduction perpetual pavement concept Layers of perpetual pavements Factors affecting pavement selection Advantages and Disadvantages Need of perpetual pavements in India Perpetual pavement in China Conclusion

2. 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.

3. 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

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5. 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

6. H M A b a s e l a y er : This is the bottom layer designed specially to resist fatigue cracking. Two approaches can be used to resist fatigue cracking in the base layer. I n t e rm ed ia t e l a y er : 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

7. W e aring Su r fa c e : 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

8. Life cycle cost Availability of quality raw materials Constructability Climatic conditions Sustainability Durability 9

9. 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. 10

10. Initial construction cost is high. Needs periodic monitoring and maintenance. Maintenance cost is high. 11

11. → 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

12. → 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. 13

13. 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. 14

14. » 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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