Department of civil Department of civil EngineeringEngineeringBUITEMSBUITEMS. .

AJNABIHANSAJNABIHANS seniors seniors

HAMAYUN KHAN KAKAR 9026HAMAYUN KHAN KAKAR 9026 ABDUL AHAD KAKAR 8904ABDUL AHAD KAKAR 8904 BAYAZEED ROSHAN ACHAK 8920BAYAZEED ROSHAN ACHAK 8920 SYED SIKANDAR SHAH 10225SYED SIKANDAR SHAH 10225 NAJEEB TAREEN 8765NAJEEB TAREEN 8765

REASONS FOR ROAD FAILUREREASONS FOR ROAD FAILURE

Rain occurs and main part of rain Rain occurs and main part of rain water flows on surface.water flows on surface. Some water is retained in the Some water is retained in the pores of soil mass called HELD pores of soil mass called HELD WATER.WATER. This HELD WATER must be This HELD WATER must be drained off from the carriage way drained off from the carriage way and shoulders effectively. and shoulders effectively.

HELD WATER ON ROAD HELD WATER ON ROAD SURFACESURFACE

IF NOT PROPERLY DRAINED??IF NOT PROPERLY DRAINED??

when this HELD WATER is not properly when this HELD WATER is not properly drained off from the carriage way and drained off from the carriage way and shoulders effectively.shoulders effectively.

It results the water to percolate to sub It results the water to percolate to sub grade.grade.

Which results in decrease in strength, Which results in decrease in strength, formation of waves and corrugation formation of waves and corrugation (folding like waves).(folding like waves).

IT CAUSES FAILURE…IT CAUSES FAILURE…

If the side drains are not provided to the If the side drains are not provided to the CARRIAGE WAYS and SHOULDERS CARRIAGE WAYS and SHOULDERS then the drainage water will cause the then the drainage water will cause the failure of the roadsfailure of the roads..

POOR DRAINAGE CAUSESPOOR DRAINAGE CAUSES

Reduction of shear strength of Reduction of shear strength of unbound material.unbound material.

Movement of fine aggregate that is Movement of fine aggregate that is unbound in flexible pavement , base unbound in flexible pavement , base and sub-base layer.and sub-base layer.

Pumping of fines are caused.Pumping of fines are caused. Durability cracking in rigid Durability cracking in rigid

pavements.pavements. Stripping of asphalt in flexible Stripping of asphalt in flexible

pavements.pavements.

Some familiar causes of FAILURESome familiar causes of FAILURE

Blockage of drainage by derbies Blockage of drainage by derbies and vegetation causes the drain and vegetation causes the drain water to flow on the surface of the water to flow on the surface of the road.road.

If this condition remains same If this condition remains same through out the year this will result through out the year this will result in the failure of pavement due to in the failure of pavement due to strippng of bitumen from strippng of bitumen from aggregates.aggregates.

EFFECTS OF POOR DRAINAGEEFFECTS OF POOR DRAINAGE

Expulsion of water due to Capillary action.

Formation of potholes due to Poor Drainage

Formation of potholes due to settlement of sub grade

Formation of waves and corrugations

Cuts in road due to Water

Stripping of Bitumen

THANKS THANKS FOR YOUR FOR YOUR ATTENTION.. ATTENTION..