Porous Pavement in Cold Climates Part 1: Design, Installation, Maintenance. Robert Roseen and Thomas Ballestero, UNH Stormwater Center (presentation given March 17, 2011)
James Purcell "Porous Asphalt Pavement for Storm Water Management" March 14, ...New Jersey Future
New Jersey Future organized a panel on March 14, 2017 at the NJ Society of Municipal Engineers quarterly meeting where James Purcell presented on "Porous Asphalt Pavement for Storm Water Management".
Porous asphalt pavement is one alternative solution to the problem of stormwater drainage from parking and other low traffic density areas.PA used in place of traditional impervious paving materials decreases the total amount of runoff leaving a site, promotes infiltration of runoff into the ground, reduces the amount of pollutants carried to a storm drain or waterway, and aids with reducing peak runoff velocity and volume.
Amir Ghavibazoo, Ph.D., Pavement Engineer, Twining, Inc., delivers a presentation on porous pavements as a alternative to traditional means of handling storm-water runoff. The presentation was delivered at the CalAPA Spring Asphalt Pavement Conference & Equipment Expo, April 12-13, 2017 in Ontario, Calif.
James Purcell "Porous Asphalt Pavement for Storm Water Management" March 14, ...New Jersey Future
New Jersey Future organized a panel on March 14, 2017 at the NJ Society of Municipal Engineers quarterly meeting where James Purcell presented on "Porous Asphalt Pavement for Storm Water Management".
Porous asphalt pavement is one alternative solution to the problem of stormwater drainage from parking and other low traffic density areas.PA used in place of traditional impervious paving materials decreases the total amount of runoff leaving a site, promotes infiltration of runoff into the ground, reduces the amount of pollutants carried to a storm drain or waterway, and aids with reducing peak runoff velocity and volume.
Amir Ghavibazoo, Ph.D., Pavement Engineer, Twining, Inc., delivers a presentation on porous pavements as a alternative to traditional means of handling storm-water runoff. The presentation was delivered at the CalAPA Spring Asphalt Pavement Conference & Equipment Expo, April 12-13, 2017 in Ontario, Calif.
“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
Self-healing technology is a new field within material technology. It represents a revolution in materials engineering and is changing the way that materials behave.
Incorporating self-healing technology into the road design process has the potential to transform road construction and maintenance processes by increasing the lifespan of roads and eliminating the need for road maintenance.
By decreasing the unnecessary premature ageing of asphalt pavements, self-healing asphalt can reduce the amount of natural resources used to maintain road networks, decrease the traffic disruption caused by road maintenance processes, decrease CO2 emissions during the road maintenance process and increase road safety. In addition to environmental savings, self-healing materials have the potential to deliver significant cost savings for road network maintenance across the EU..
There are three main self-healing technologies available for asphalt pavement design:
Nanoparticles,
Induction heating and
Rejuvenation.
This study reviews all three options and outlines the future development of self-healing asphalt technology
Permeable paving is a range of sustainable materials and techniques for permeable pavements with a base and sub-base that allow the movement of storm water through the surface
Analyzing Effects of Various Kinds of Multi-Wall Carbo Nanotubes (MWCNT) on P...crimsonpublisherscojrr
Due to the significance and unique properties of Multi-Wall Carbon Nanotubes (MWCNT), in the present investigation, the viability of these materials in the Water-Based Mud (WBM) is assessed. The impacts of various kinds of MWCNT, mud additives and surfactants on the rheological properties, water loss and drilling fluid stability of the WBM are experimentally investigated. The results have demonstrated various kinds of MWCNT, additives, and surfactants have affected the rheological properties of the WBM. Adding MWCNT and Polyethylene Glycol (PEG) alone or together decrease the terms of rheological properties performance as subsequent order CNT; CNT + PEG; PEG. Surface modified carbon nanotube (Functionalize Carbon Nano Tube [FCNT]) improves rheological properties of the WBM and increases the shale recovery. All in all, the presence of Multi-Wall Carbon Nanotubes increases the efficiency of polymers and improves the rheological properties and performance of the water base mud.
“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
Self-healing technology is a new field within material technology. It represents a revolution in materials engineering and is changing the way that materials behave.
Incorporating self-healing technology into the road design process has the potential to transform road construction and maintenance processes by increasing the lifespan of roads and eliminating the need for road maintenance.
By decreasing the unnecessary premature ageing of asphalt pavements, self-healing asphalt can reduce the amount of natural resources used to maintain road networks, decrease the traffic disruption caused by road maintenance processes, decrease CO2 emissions during the road maintenance process and increase road safety. In addition to environmental savings, self-healing materials have the potential to deliver significant cost savings for road network maintenance across the EU..
There are three main self-healing technologies available for asphalt pavement design:
Nanoparticles,
Induction heating and
Rejuvenation.
This study reviews all three options and outlines the future development of self-healing asphalt technology
Permeable paving is a range of sustainable materials and techniques for permeable pavements with a base and sub-base that allow the movement of storm water through the surface
Analyzing Effects of Various Kinds of Multi-Wall Carbo Nanotubes (MWCNT) on P...crimsonpublisherscojrr
Due to the significance and unique properties of Multi-Wall Carbon Nanotubes (MWCNT), in the present investigation, the viability of these materials in the Water-Based Mud (WBM) is assessed. The impacts of various kinds of MWCNT, mud additives and surfactants on the rheological properties, water loss and drilling fluid stability of the WBM are experimentally investigated. The results have demonstrated various kinds of MWCNT, additives, and surfactants have affected the rheological properties of the WBM. Adding MWCNT and Polyethylene Glycol (PEG) alone or together decrease the terms of rheological properties performance as subsequent order CNT; CNT + PEG; PEG. Surface modified carbon nanotube (Functionalize Carbon Nano Tube [FCNT]) improves rheological properties of the WBM and increases the shale recovery. All in all, the presence of Multi-Wall Carbon Nanotubes increases the efficiency of polymers and improves the rheological properties and performance of the water base mud.
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Highway Materials: Desirable Properties, Testing Procedures, Standards, and standard values relating to Soil, Stone Aggregates, Bitumen and Tar, fly- ash/pond-ash. Role of filler in Bituminous mix, materials of filler.
Specifications of DLC and PQC for rigid pavement
This presentation discusses pavement construction issues, and the use of interlayers in pavement widening. Prepared by Katie Strain and Michael Samueloff of TENCATE. Please remember to cite this research if the information you find here is used.
Polymer road technology is about innovations in road construction leading to technological development of nation. It's an innovative platform which combines Civil and Polymer engineering for better economic outcomes.
A Compatibility Study on Different Types of Cement and Plasticizerijsrd.com
It has long been a concrete technologist's dream to discover method of making concrete at the lowest possible water/cement ratio while maintaining a high workability. To a considerable extent this dream has been fulfilled with the advent of super plasticizers. It has added a new dimension to the application of admixtures with regards to production of high strength and flow able concretes. It is now possible to produce concrete with compressive strength of the order of 90Mpa (90 N/mm2). In the wake of energy conservation policy and diminishing supplies of high quality raw materials, there is a need to use marginal quality cements and aggregates for the production of concrete. In such instances the use of plasticizers/super plasticizers permits the production of concrete at low water/ cement ratios. We have taken ultra tech opc cement & coromandal ppc cement to find the compatibility by adding perma plast (plasticizer). The water cement ratio was maintained as 0.40 &0.45 for OPC & PPC respectively. To study the effect of these PP on various properties of concrete. The dosage of plasticizers/super plasticizers was measured as 1.5% for Perma plast for OPC & 1.3% for PPC by the weight of cement.
Save the Rain: Controlling the Good Water/Bad Water Dilemma
Tom Rhoads, Commissioner, Onondaga County Dept of Water Environment Protection
Matthew Marko, Vice President, CH2M HILL
Presented at New York State Association of Counties Fall Seminar
September 12, 2012
Onondaga County's Green Infrastructure "Project 50" Construction - presented to New York State Association of Transportation Engineers Conference on May 24, 2012
What originally began as a means to provide plantings to disguise aboveground features on the project, evolved into a public educational area which is anticipated to include rain gardens, porous pavements, and a bicycle and pedestrian path. The process that the County, its engineers, and the community stakeholders participated in to shape the CSO project restoration into a design that will meet the project needs of all involved will be discussed, in addition to “lessons learned”.
Presentation on "greening the gray" projects in Onondaga County, NY. Presented at the 2012 NYWEA Conference by Bob Kukenberger, Gray Infrastructure Program Manager, CDM Smith.
Using Porous Pavements and Other Green Technologies to Reduce Urban Runoff and Combined Sewer Overflows. Dan Wible, CH2M Hill (presented March 17, 2011)
The Harbor Brook CSO 018 Constructed Wetlands Pilot Treatment System Project serves the dual purposes of treating CSO 018 overflows currently discharged into Harbor Brook while also acting as a demonstration project to test the effectiveness of three types of constructed treatment wetland systems.
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
Let's dive deeper into the world of ODC! Ricardo Alves (OutSystems) will join us to tell all about the new Data Fabric. After that, Sezen de Bruijn (OutSystems) will get into the details on how to best design a sturdy architecture within ODC.
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
UiPath Test Automation using UiPath Test Suite series, part 3DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
Software Delivery At the Speed of AI: Inflectra Invests In AI-Powered QualityInflectra
In this insightful webinar, Inflectra explores how artificial intelligence (AI) is transforming software development and testing. Discover how AI-powered tools are revolutionizing every stage of the software development lifecycle (SDLC), from design and prototyping to testing, deployment, and monitoring.
Learn about:
• The Future of Testing: How AI is shifting testing towards verification, analysis, and higher-level skills, while reducing repetitive tasks.
• Test Automation: How AI-powered test case generation, optimization, and self-healing tests are making testing more efficient and effective.
• Visual Testing: Explore the emerging capabilities of AI in visual testing and how it's set to revolutionize UI verification.
• Inflectra's AI Solutions: See demonstrations of Inflectra's cutting-edge AI tools like the ChatGPT plugin and Azure Open AI platform, designed to streamline your testing process.
Whether you're a developer, tester, or QA professional, this webinar will give you valuable insights into how AI is shaping the future of software delivery.
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
Download the full report from here:
https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
Builder.ai Founder Sachin Dev Duggal's Strategic Approach to Create an Innova...Ramesh Iyer
In today's fast-changing business world, Companies that adapt and embrace new ideas often need help to keep up with the competition. However, fostering a culture of innovation takes much work. It takes vision, leadership and willingness to take risks in the right proportion. Sachin Dev Duggal, co-founder of Builder.ai, has perfected the art of this balance, creating a company culture where creativity and growth are nurtured at each stage.
Dev Dives: Train smarter, not harder – active learning and UiPath LLMs for do...UiPathCommunity
💥 Speed, accuracy, and scaling – discover the superpowers of GenAI in action with UiPath Document Understanding and Communications Mining™:
See how to accelerate model training and optimize model performance with active learning
Learn about the latest enhancements to out-of-the-box document processing – with little to no training required
Get an exclusive demo of the new family of UiPath LLMs – GenAI models specialized for processing different types of documents and messages
This is a hands-on session specifically designed for automation developers and AI enthusiasts seeking to enhance their knowledge in leveraging the latest intelligent document processing capabilities offered by UiPath.
Speakers:
👨🏫 Andras Palfi, Senior Product Manager, UiPath
👩🏫 Lenka Dulovicova, Product Program Manager, UiPath
From Daily Decisions to Bottom Line: Connecting Product Work to Revenue by VP...
Porous Pavement in Cold Climates Part 1
1. Porous Pavements in Cold Climates
Part 1: Design, Installation, and
Maintenance
A Green Infrastructure, Green Jobs, and Green
Funding Workshop
Onondaga Environmental Institute
March 2011
Robert Roseen, PE, PhD, D.WRE,
Thomas Ballestero, PE, PhD, PH, CGWP, PG, James Houle, CPSWQ
University of New Hampshire Stormwater Center
Department of Civil Engineering, University of New Hampshire
2. Gregg Hall ● 35 Colovos Road ● Durham, New Hampshire 03824-3534
603.862.4024 ● http://www.unhsc.unh.edu
Dedicated to the protection of water resources through
effective stormwater management
• Research and development of stormwater treatment systems
• To provide resources to stormwater communities currently involved in design
and implementation of Phase II requirements
3. Acknowledgements and Sources
UNHSC Design Specification for Porous Asphalt Pavements
and Infiltration Beds
Joshua F. Briggs, Geosyntec, Kristopher Houle, Horsley
Witten Group
Jeff Pochily, David Duncan, Mary Wescott, Pike Industries
Andrew Potts, P.E., LEED AP, Water Resources Project
Manager, CH2M HILL
ASCE Committee Report on Recommended Design
Guidelines for Permeable Pavements—Late 2010
Bethany Eisenberg, VHB, Committee Chair
Kelly Collins, CWP, Committee Vice Chair
National Asphalt Pavement Association (NAPA): Information
Series (IS)-131 Porous Asphalt Pavements (2008)
NAPA IS-115 Open-Graded Friction Courses (2002)
3
4. Part I Overview
1. State of the Practice
2. Common Design and
Installation Pitfalls
3. Design and Installation
Specifications
4. Maintenance
5. Repairs
4
5. State of the Practice
Water quality performance is strong to
excellent depending on design
Hydraulic performance is excellent
Cold climate performance is strong
Winter maintenance has tremendous
potential salt reduction
Design specifications are improving
Construction and installation are developing
5
6. State of the Practice
Significant advancements in PA strength,
durability, an cost have been achieved
Large increase in significant PA installs for
light duty, residential, commercial, and
state road applications
However, a large number of installations
STILL continue to be sub-standard
WHY???
6
7. Porous Asphalt Design Overview
Porous pavements for new and
redevelopment are a watershed-
based strategy that can both
mitigate impacts for new
development and reverse impacts
in areas with redevelopment.
Porous asphalt systems combine
stormwater infiltration, storage,
and structural pavement in a
single system.
PA consists of a pavement
surface underlain by a
stormwater storage bed. The bed
is usually placed on uncompacted
soil to facilitate infiltration.
7
8. Porous Asphalt Path, Grey Towers
Porous Asphalt Residential Lane, Pelham, NH UNH Elliot Alumni Center Parking Lot National Historic Site, PA
(Source: UNHSC) Durham, NH (Source: UNHSC) (Source: CH2M HILL)
Porous Asphalt Commercial Parking Lot, Porous Asphalt Section of State Highway, Porous Asphalt Basketball Court,
Greenland Meadows, Greenland, NH South Portland, ME (Source: ME DOT) Upper Darby, PA
(Source: UNHSC) (Source: CH2M HILL)
8
9. Typical Porous Asphalt System Sections
Section with Filter Course for Water Quality
Typical Section for Storage and Infiltration
Pervious pavement: 4-6” (10 - 15 cm) of porous asphalt
Choker Course: 4”-8” (10 – 20 cm) minimum
Filter Course: 8” - 12” (20 - 30 cm) minimum thickness of subbase
(aka. bank run gravel or modified 304.1)
Filter Blanket: intermediate setting bed: 3” (8 cm) thickness of 3/8” (1 cm) pea gravel
Reservoir Course: 4” (10 cm) minimum thickness of 3/4” (2 cm) crushed stone for
frost protection, 4-6” (10-15 cm) diameter perforated subdrains with 2” cover
Optional-Liner for land uses where infiltration is undesirable
(e.g., hazardous materials handling, sole-source aquifer protection)
Native materials
9
11. Common Pitfalls
Inappropriate PA mix selection WRT to
durability leads to raveling and low durability
Poor subbase compaction—tendency to
under-compact due to concerns regarding
infiltration leads to rutting
Poor asphalt compaction—tendency to
under-compact due to weaker subbase
leads to low pavement durability
All issues can be addressed through qualified
engineering oversight
11
12. Why So Many Poor Installations?
Porous pavements are an filtration/infiltration
system as well as a transportation
surface.
Because of dual functionality:
Greater site evaluation and design effort
Strict engineering oversight and skilled
personnel through all phases of the project
Requires a comprehensive maintenance
schedule
12
13. Applications - Site Constraints
1. Minimum 2-foot separation from bedrock and
seasonal high water table,
2. Measured soil infiltration rates typically between 0.25
and 12 inches per hour, <0.25 in/hr may require
additional drainage and recharge beds
3. Appropriate separation from wells, septic systems,
subsurface structures (basements), etc.
4. Where risk of groundwater contamination exists, as
with any LID filtration system, the system may be
lined to prevent infiltration , thereby being limited to
it’s filtration benefits
13
14. General Design Criteria
1. Pretreatment or avoidance of runoff from hot spots,
2. Locations of potential groundwater contamination from
either high loading, high groundwater, or bedrock
should employ liners.
3. Level, or nearly level stormwater bed bottoms; sloped
installations will need to employ internal grade controls
4. A consideration of the loading ratio (ratio of drainage
area to infiltration area),
5. Consideration of potential sediment, detritus, etc.
sources that could lead to clogging,
6. Proper drainage
14
15. Porous Asphalt Mixes
1. LOW-MODERATE DURABILITY: PG 64-28* with 5
pounds of fibers per ton of asphalt mix. This mix is
recommended for smaller projects with lower traffic
counts or loading potential. This mix is manageable at
common batch plants.
2. MODERATE DURABILITY: Pre-Blended PG 64-28*
SBS/SBR with 5 pounds of fibers per ton of asphalt
mix. This mix is recommended for large projects >
1acre where high durability pavements are needed.
3. HIGH DURABILITY: Pre-Blended PG 76-22** modified
with SBS/SBR and 5 pounds of fibers per ton of
asphalt mix. This mix is recommended for large sites
anticipating high wheel load (H-20) and traffic counts
for maximum durability.
*or PG binder typical to region; **PG binder 2 grades stiffer
15
16. Porous Asphalt Mix Criteria
Sieve Size (inch/mm) Percent Passing (%)
0.75/19 100
0.50/12.5 85-100
0.375/9.5 55-75
No.4/4.75 10-25
No.8/2.36 5-10
No.200/0.075 (#200) 2-4
Binder Content (AASHTO T164) 6 - 6.5%
Fiber Content by Total Mixture Mass 0.3% cellulose or
0.4% mineral
Rubber Solids (SBR) Content by Weight of the 1.5-3% or TBD
Bitumen
Air Void Content 16.0-22.0%
(ASTM D6752/AASHTO T275)
Draindown (ASTM D6390)* < 0.3 %
Retained Tensile Strength (AASHTO 283)** > 80 %
Cantabro abrasion test on unaged samples < 20%
(ASTM D7064-04)
Cantabro abrasion test on 7 day aged samples < 30%
16
17. Cold Climate Considerations
Thickness of sub-base materials is determined
based on various factors
1. In cold climates / penetration of freezing Total
system thickness ≥ 0.65 * Dmax frost
depth (Ex. if Dmax = 48” sub-base depth =
32”)
2. The high voids content of the reservoir course
creates a capillary barrier to prevent wicking of
moisture in subbase minimizing winter freeze-
thaw and heaving
17
19. Compaction and Rutting
Install filter, choker, gravel, and stone base course aggregate
in 8-inch maximum lifts to a MAXIMUM of 95% standard
proctor compaction (ASTM D698 / AASHTO T99).
The density of subbase courses shall be determined by
AASHTO T 191 (Sand-Cone Method), AASHTO T 204 (Drive
Cylinder Method), or AASHTO T 238 (Nuclear Methods), or
other approved alternate
The infiltration rate (ASTM D3385 or approved alternate ) shall
be no less 5-30 ft/day or 50% of the hydraulic conductivity
(D2434) at 95% standard proctor compaction
19
20. Multiple lift installation
PA can be installed as 1 or 2 lifts depending on site
2nd lift improves pavement compaction
Paving sequencing is important---plan to minimize traffic
on completed lifts
Should be up to the contractor. Small simple jobs may
be easier in a single lift, larger jobs in two lifts.
Two-lift scenario may require use of a light application of
tackifier between the first and second lift.
Enables installation of curbs and castings in typical
fashion
Simplifies use of “tacky” 64-28SBR/SBS or 76-
22SBR/SBS as top layer and 64-28 with fibers as base
course 20
23. Asphalt Compaction
Immediately after the asphalt mixture has been spread, struck off, and
surface irregularities adjusted, it shall be thoroughly and uniformly
compacted by rolling. The compaction objective is 16% - 19% in place
void content (Corelock).
Breakdown rolling shall occur when the mix temperature is between 275
to 325°F
Intermediate rolling shall occur when the mix temperature is between
200 to 275°F
Finish rolling shall occur when the mix temperature is between 150 to
200°F
The cessation temperature occurs at approximately 175°F, at which point
the mix becomes resistant to compaction and will not achieve adequate
durability.
Rolling should not cause undue displacement, cracking, or shoving.23
24. Liners
Federal guidelines regulate groundwater
protection standards.
Most states require 1-3 ft separation between
the system and the seasonal high water table
(or bedrock).
Liners can be used for sites where the infiltration
is not appropriate (eg. high water table,
bedrock karst sites and hot spots where
hazardous materials may be handled).
The use of Liners will preserve water quality
through detention and filtration but limit any
infiltration.
Liners can be made from HSG 'D' soils, HDPE,
or clay
24
26. Bedrock covered by HDPE
Construction of Subsurface Bed
liner & BRG
Choker course placed for stability
Under-drains set in crushed gravel
26
27. Geotextiles
Recommendations vary on the usage of
geotextiles in pervious pavement systems.
At minimum, geotextiles should be used on soils
with poor load bearing capacity, high fines
content, and on the sides of the excavation to
prevent in-migration of fines.
Infiltration systems, such as pervious
pavements, that are subject to soil movement
and deposition should carefully consider the
usage of geotextiles.
27
28. Post Construction O&M
Curing time needs are site specific but there should be at
least 24-48 hrs of curing. Common sense clause may
lead to lower threshold for small jobs with lighter loading
such as when pavement surface is less than 100 F (one-
time measurement). Problems occur when the surface
temperature is greater than 120 F.
28
30. Maintenance
The best maintenance is designing
for low maintenance
Preventing run-on is a key to
extending the life of permeable
surfaces.
Powerful vacuum (36-in)
Feeder broom effective at loosening
some larger debris
Onboard PW effective at unclogging,
but some dripped back onto pvt
Vacuuming minimum of 2-4 times per
year for low use sites and up to
weekly -monthly for high use sites
Costs range from $350-500/acre
30
31. Repairs and Replacement
Damage can occur to PA from non-design
loads
Repairs may be needed from cuts for utilities
Repairs can be made with standard HMA for
most damages up to 15% of surface area
PA can be repaired by heating and rerolling
at $2000/day at approximately 500’ of trench
When pavement reaches end of life, it is
replaced by milling to choker coarse.
March 25, 2010 31
32. Used for repairs
around manholes,
catch basins, and for
reworking rough
pavement areas
Asphalt in the repair
area can be raked and
rolled back into place
and additional hot mix
can be added when
Repairs cost ~$2000
March 25, 2010 32
34. Greenland Meadows Commercial
“Gold-Star” Commercial
Development
Cost of doing business near
Impaired Waters/303D
High water table, poor soils
Brownfields site, ideal location,
15yrs
Proposed site >10,000 Average
Daily Traffic count on >30 acres
35. 28 ac site, initially >95% impervious, now <10%EIC, with all drainage through filtration, expected to have minimal
WQ impact except thermal and chloride
3/23/2011 35
37. Boulder Hills, Pelham, NH
2009 Installation of 900’ of
first PA private residential
road in Northeast
Site will be nearly Zero
discharge
LID subdivision 55+ Active
Adult Community
Large sand deposit
Cost 25% greater per ton
installed
3/23/2011 37
39. Maine Mall, Long Creek Watershed
S. Portland, ME
Surface
Transportation ARRA
Project
First DOT PA road in
the northeast-Sept 09
1500 feet of Highway
Reconstruction
20,000 vehicles per
day
40. Maine Mall
Significant that DOT is
even considering it
DOT involvement in PA is
crucial for success
Rockstar Mix
PG76-24SBS with
Fibers
High durability
RDA/TMDL was essential
41. Conclusions
Porous pavements are not a silver bullet
PP are a watershed-based strategy that can
both mitigate impacts for new development and
reverse impacts in areas with redevelopment.
Successful installations will require
Greater site evaluation and design effort
Strict engineering oversight and skilled personnel
through all phases of the project
Requires a comprehensive maintenance schedule
41
42. Looking Forward
The need for training and possible
certification for designers and installers
Installation checklist
Increased availability of PA suppliers
Greater availability of pavement cleaning
42