B.U.I.T.E.M.S Pakistan

1. 1

2. DESIGN OF FLEXIBLE PAVEMENT
(Cantt by Pass Nawan Kili and Khalid
Aviation Base Terminating at Kach
Road After Kili Nasran 4 km)
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3. OUTLINE
Introduction
Laboratory Tests
Design of Pavement
Conclusion & References
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4. INTRODUCTION
• Our project is flexible pavement design that
is cantt bypass nawan killi and Khalid air
base after killi Nasran link road Quetta
(Balochistan)
• Which is about 4 KM
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5. FOLLOWING DESIGN FEATURES
HAVE BEEN ADOPTED
• Formation width = 24 ft
• Carriage way = 12 ft
• Shoulder each side = 6 ft
• Premix or surfacing course = 2 in thick
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6. PAVEMENT LAYERS THICKNESS
• Earth work = As per survey sheet
• Sub base = 6” Compacted
9” Lose
• Base Course = 6” Compacted
9” Lose
• Premix Carpeting = 2 in OR 2.5 in Thick
• Structure Work = As per Survey Sheet
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7. DRAINAGE
• Drainage is the one of the main factor
contributing the performance of the road, as
many road failures occur because of
inadequate drainage.
• There are two types of drainage
1) Surface drainage
2) Sub-Surface drainage
• We have provided drains to avoid the failure
due to drainage
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8. ESTIMATION
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9. LABORATORY TESTS
• Atterberg Limit :
• Atterberg limit are the basic measure of the
nature of fine-grained soil, depanding upon
the water content of the soil.
• The atterberg limit can be used to distinguish
b/w silt and clay
Liquid Limit
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10. LIQUID LIMIT
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11. 11

12. PLASTIC LIMIT
• Plastic limit is defined as the moisture content
where the threads breaks apart at a diameter
of 3mm (1/8”)
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13. PLASTIC LIMIT:
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14. PLASTICITY INDEX
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15. PROCTER TEST
• To determined the compaction properties of
the soil
• The object of experiment is to determined
the relationship between water content (w)
and Dry density (γD) of the soil.
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16. DRY DENSITY (ƿ)
FOR THE DETERMINATION OF MAXIMUM DRY DENSITY AND
OPTIMUM MOISTURE CONTENT WE USE THE MODIFIED AASHTO
COMPACTION METHOD
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17. WATER CONTENT (W)
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18. RELATIONSHIP BETWEEN DRY DENSITY AND
WATER CONTENT
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19. CBR TEST
• Soil subgrade sample was obtained from the project site and the CBR test
was conducted at field density. The following were the results:
CBR value of soil sub-grade
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20. THE PLOT IS MADE BETWEEN LOAD IN KG VERSUS PENETRATION OF PLUNGER FOR
THE TEST DATA OBTAINED FOR SOIL SUB-GRADE AS GIVEN IN FIGURE BELOW . LOADS
AT 2.5 AND 5 MM PENETRATION ARE 55 AND 78 KG RESPECTIVELY.
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21. PAVEMENT DESIGN BY CBR METHOD
• To measure the strength of road and pavement sub grade .
• It is most widely used for flexible pavement
CBR value Sub grade
strength
3% & Less poor
3% — 5% Normal
5% —15% Good
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22. PAVEMENT DESIGN BY CBR METHOD
• Adopt CBR value = 4.0 percent.
• The result obtained by the test are used with the imperial curve to
determined the thickness of pavement layers
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23. DESIGN OF LAYERS THICKNESS
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24. DESIGN OF PAVEMENT BY GROUP
INDEX METHOD
• G.I = (F 200-32 ) [0.2 +.005 (LL – 40 )] +0.01 ( F200 – 15 ) ( p.I
-10 )
G.I = 6
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25. THICKNESS OF LAYERS
• 1 - Thickness of Sub-base = 15 cm (6 inches)
• 2 - Combine thickness of Surface , Base & Sub- base
Course = 36 cm
• 3 - Thickness of Base & Surface Course =36 – 15 =
21 cm (8 inches)
• Now
• Thickness of Sub base Layer = 6 inches
• Thickness of Base Layer = 6 inches
• Thickness of Surface Layer = 2 inches
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26. PROPOSED CROSS SECTION
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27. CONCLUSION:
• After completion of the propose project following
people will be benefited to approach the city and
Hanna valley,
. Tourist
. Inhabitant of Quetta city
. Beneficiaries of Hanna Urak
as presently the existing road is in full deplorable
condition and it need to be black topped on priority
basis.
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28. • The geometry road has been improved by removing
the sharp curve and sight distance has been
improved to facilitate the drivers
• Previously the drains were provided at the sides of
the roads and were not properly constructed, due to
which many problems were encountered such as
. Erosion
. Water logging
. Bad smell due to stagnant water
• Footpath are provided to facilitate the pedestrians.
• At every 500 meter a service chamber is provided for
utilities
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29. • This project has been undertaken as an integral part
of our
Civil Engineering Program.
References
• AASHTO manual. A policy on
Flexible pavement design of Highway
• www.wikipedia.org
• Highway Engineering by S.K.Khanna & C.E.G Justo
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30. Thanks
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