porous asphalt pavement
DESCRIPTION
“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 themTRANSCRIPT
1POROUS ASPHALT PAVEMENT
CHARLY OUSEPHS7CACLASS NO. : 26M.A.COLLEGE OF ENGINEERINGKOTHAMANGALAM
Guided by, Prof. Leni Stephen
2CONTENTS
INTRODUCTION POROUS ASPHALT DESIGN CRITERIA CONSTRUCTION OF PAVEMENT COST & MAINTENANCE ADVANTAGES DISADVANTAGES CONCLUSION REFERENCES
3INTRODUCTION
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 Does not require additives
4POROUS ASPHALT
Lower concentration of fines Voids more than 20% Polymers and/or fibers can be used Mixed at a standard asphalt plant “recharge bed” built of stones
5DESIGN CRITERIA
4” OPEN GRADED FRICTION COURSE(POROUS PAVEMENT)
4” OF 3/4” WASHEDCRUSHED 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.
GEOTEXTILE LAYER
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SECTION OF POROUS ASPHALT PAVEMENT
7CONSTRUCTION OF PAVEMENT /PARKING LOT
A. EXCAVATED WITHOUT HEAVY EQUIPMENT COMPACTING THE BED BOTTOM.
B. NON-WOVEN GEOTEXTILE IS LAID
8C. CLEAN (WASHED) UNIFORMLY GRADED AGGREGATE IS PLACED IN THE BED AS THE STORAGE MEDIA.
D. THE ASPHALT IS LAID DOWN JUST LIKE STANDARD ASPHALT AND COMPACTED.
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This road is made of porous asphalt.
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11COMPARISON
Low visibility
Water splashAnd spray
Traffic noise
High visibility
Secured skidresistance
Quiet
Dense Graded Asphalt Pavement Porous Asphalt Pavement
12COST & 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
13ADVANTAGES
Flood control Recharges groundwater to underlying aquifers Extended pavement life due to well drained base maintains traction while wet Reduced spray from traveling vehicles, reduced
roadway noise Allows for reduction of storm water infrastructure
14DISADVANTAGES
Requires routine vacuum sweeping
Accidental seal-coating, will cause failure
Quality control for material production and installation are essential for success
15CONCLUSION
Most effective and affordable techniques for addressing storm water management
Recharging and replenishing ground water Longer life than ordinary pavements High pollutant removal efficiency by reducing runoff Improving the quality of water Maintaining a cooler pavement
16REFERENCES Akihiro Moriyoshi , Toshiro Jin , Takaaki Nkai and Hiroshi Ishikawa
(2013), Construction and Building 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.138engineering,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
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