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(Cantt by Pass Nawan Kili and Khalid Aviation Base Terminating at Kach

Road After Kili Nasran 4 km)

DESIGN OF FLEXIBLE PAVEMENT

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OUTLINE

Introduction

Laboratory Tests

Design of Pavement

Conclusion & References

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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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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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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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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 drainage1) Surface drainage2) Sub-Surface drainage

• We have provided drains to avoid the failure due to drainage

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ESTIMATION

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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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LIQUID LIMIT

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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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PLASTIC LIMIT:

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PLASTICITY INDEX

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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.

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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WATER CONTENT (W)

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RELATIONSHIP BETWEEN DRY DENSITY AND WATER CONTENT

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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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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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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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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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DESIGN OF LAYERS THICKNESS

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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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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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PROPOSED CROSS SECTION

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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 deplorablecondition and it need to be black topped on priority basis.

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• 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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• This project has been undertaken as an integral part of our Civil Engineering Program.

References

• AASHTO manual. A policy onFlexible pavement design of Highway

• www.wikipedia.org

• Highway Engineering by S.K.Khanna & C.E.G Justo

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Thanks