POROUS ASPHALT PAVEMENT

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“When it pours, it’s porous.” Porous asphalt pavements offer developers and planners a new tool in their toolbox for managing storm water. These pavements, used mostly for parking lots, allow water to drain through the pavement surface into a stone recharge bed and infiltrate into the soils below the pavement. Such pavements have been proving their worth since the mid-1970s, and recent changes in storm water regulations have prompted many consulting engineers and public works officials to seek information about them

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POROUS ASPHALT PAVEMENT:

POROUS ASPHALT PAVEMENT CHARLY OUSEPH S7CA CLASS NO. : 26 M.A.COLLEGE OF ENGINEERING KOTHAMANGALAM Guided by, Prof. Leni Stephen 1

CONTENTS:

CONTENTS INTRODUCTION POROUS ASPHALT DESIGN CRITERIA CONSTRUCTION OF PAVEMENT COST & MAINTENANCE ADVANTAGES DISADVANTAGES CONCLUSION REFERENCES 2

INTRODUCTION:

INTRODUCTION Allow water to drain Open graded asphalt concrete (OGAC), open graded friction course (OGFC), and permeable asphalt Storm water management Allow the water to spread over D oes not require additives 3

POROUS ASPHALT:

POROUS ASPHALT L ower concentration of fines Voids more than 20 % P olymers and/or fibers can be used M ixed at a standard asphalt plant “recharge bed” built of stones 4

DESIGN CRITERIA:

DESIGN CRITERIA 4” OPEN GRADED FRICTION COURSE (POROUS PAVEMENT) 4” OF 3/4” WASHED CRUSHED STONE 12”-18” OF 1.5”- 2.5” WASHED CRUSHED STONE UNCOMPACTED SUBGRADE Slope Limit surface slope to 5 %. Construct bottom as flat as possible. Use conventional HMA for steeper slopes. Avoid compacting soils during construction. Avoid excessive earthwork. 5 GEOTEXTILE LAYER

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6 SECTION OF POROUS ASPHALT PAVEMENT

CONSTRUCTION OF PAVEMENT /PARKING LOT :

CONSTRUCTION OF PAVEMENT / PARKING LOT EXCAVATED WITHOUT HEAVY EQUIPMENT COMPACTING THE BED BOTTOM. NON-WOVEN GEOTEXTILE IS LAID 7

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CLEAN (WASHED) UNIFORMLY GRADED AGGREGATE IS PLACED IN THE BED AS THE STORAGE MEDIA. THE ASPHALT IS LAID DOWN JUST LIKE STANDARD ASPHALT AND COMPACTED. 8

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This road is made of porous asphalt . 9

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COMPARISON:

COMPARISON 11 Low visibility Water splash And spray Traffic noise High visibility Secured skid resistance Quiet Dense Graded Asphalt Pavement Porous Asphalt Pavement

COST & MAINTENANCE:

COST & MAINTENANCE Total project cost is comparable with ordinary asphalt pavement Material cost is 20-25% more than ordinary asphalt Vacuum sweep twice per year Clean inlets twice per year Do not seal coat Repairs can be made with standard asphalt not to exceed 10% of surface area 12

ADVANTAGES :

ADVANTAGES Flood control Recharges groundwater to underlying a quifers Extended pavement life d ue to well d rained b ase m aintains t raction w hile w et Reduced spray from traveling v ehicles , reduced r oadway n oise Allows for reduction of storm water i nfrastructure 13

DISADVANTAGES:

DISADVANTAGES Requires routine vacuum s weeping Accidental seal-coating , will cause f ailure Quality control for material p roduction and installation are essential for success 14

CONCLUSION:

CONCLUSION M ost effective and affordable techniques for addressing storm water management R echarging and replenishing ground water Longer life than ordinary pavements H igh pollutant removal efficiency by reducing runoff I mproving the quality of water M aintaining a cooler pavement 15

REFERENCES:

REFERENCES Akihiro Moriyoshi , Toshiro Jin , Takaaki Nkai and Hiroshi Ishikawa (2013), Construction and B uilding Materials , Evaluation methods for porous asphalt pavement in service for fourteen years Vol.42 ,pages 190-195. Robert M Roseen , Thomas P Ballestro,James J Houle,Joshua F Briggs and Kristopher M Houle (2012),Journal of environmental vol.138 engineering,water quality and hydrologic performance of a porous apalt pavement as a storm water treatment strategy in a cold climate Mohd Rosli Mohd Hasan,Jia Yih Eng,Moer Othman Hamzah and J.L.m Voskuilen (2013),Construction and Building Materials, The effects of breakpoint location and normal maximum aggregate size on porous asphalt properties vol 44,pages 360-367 Glanluca Dell Acgua ,Moro kura , Raffaelo Mauro and Francesca Russo (2012), procedia -Social and Behaviour Sciences , Freeway crashes in wet weather ;the comparative influence of porous and conventional asphalt surfacing Vol 54,pages 618-627 16

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