The Evolution of Hot In-Place Asphalt Recycling in British ...The Evolution of Hot In-Place Asphalt...
Transcript of The Evolution of Hot In-Place Asphalt Recycling in British ...The Evolution of Hot In-Place Asphalt...
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The Evolution of Hot In-Place Asphalt Recycling
in British Columbia
presented to the
Transportation Association of Canada by
Patrick Wiley
Ecopave Asphalt Recycling Inc April 14th 2013
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Agenda
• Background • What’s new • How it works • Where it works
2 Sustainability is not op.onal
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We are the Ecopave Group • 25 years HIPAR experience • Over 2000 lane km completed • Invented the Multi-Stage HIPAR Process • Winner 2008 Best Paving Project Award
• Nominated 2012
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• Heats, removes, rejuvenates and re-lays in a single pass • Reduces cost, traffic disruption and Greenhouse gases • Conserves non-renewable paving materials
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HIPAR: Hot In-Place Asphalt Recycling
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BC HIPAR: past 25 years • Multiple iterations of methods and machines • Process of continuous improvement • Over 9000 lane km completed
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Mul+-‐Stage Hot Milling • 50 mm processing depth Addi+ve Systems • Computerized Controls
• Pugmill Mixers Emissions Systems • Captures and incinerates
25 Years of experience • Best prac+ce established • Consistent outcomes
Key innovations
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“Stand alone” runway at Kelowna Airport in 2012 7
• “Stand-alone” treatment (final product, no overlay needed) • About 500 lane km are recycled each year • Major highways and runways
BC HIPAR Today
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First “Stand-Alone” Runway in 2012 • Kelowna International Airport: 3200 m x 61 m • 50 mm HIPAR with 30% new HMA and recycling agent • All specifications met, completed on time and on budget • Client happy, saved over $3 million
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New Three-Stage Recycler
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Three-Stage Components • Preheater • 3 Hot Milling Machines • Pugmill Remixer • Conventional Paver
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Three Hot Milling Machines
11 120 C Windrow
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Heat Heat Mill Heat Mill Mill
Lift windrow over heater
Three-Stage Hot Milling Process
1 2 3
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The aggregates roll out of the heated, softened pavement without being crushed
Why Hot Milling?
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Radiant heater
120 C windrow
Millers
DIRECTION OF WORK
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• Lower surface temperature required • Aggregates removed without crushing • Changes to aggregate gradation minimized • Enables high performance, high RAP mix designs
Three-Stage Hot Milling reduces the degradation of reclaimed materials
50 mm
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2
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The Pugmill Remixer
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• Computerized additive controls & twin shaft pugmill • Recycling agent and 20 to 30% new HMA
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The Three-Stage HIPAR Process
Heat Mill Add new HMA
Blend with Pugmill
Laydown
HEATER MILLER 1 HEATER MILLER 2 PUGMILL REMIXER
Add Rejuvenator Lift Windrow over Heater
HEATER MILLER 3
DIRECTION OF WORK
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Recycling Agent • Recycling Agent: A select group of Maltenes that
restores chemical balance of binder. • Not an emulsion
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Adding new HMA
Benefits:
• Improves ride
• Increase air voids
• Modify to more fine or coarse,
• Increase fracture count
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Compaction with conventional methods
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Smooth, consistent, free from segregation
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Emissions are collected and incinerated
Incinera+on Chamber
Collec+on Ducts
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Percentage of Bonus for Smoothness Source: BC MoT
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0% 10% 20% 30% 40% 50% 60% 70% 80% 90%
100%
2004 2005 2006 2007 2008 2009 2010 2011 2012
Conven+onal HIPAR
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Percentage of Bonus for Density Source: BC MoT
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0% 10% 20% 30% 40% 50% 60% 70% 80% 90%
100%
2004 2005 2006 2007 2008 2009 2010 2011 2012
Conven+onal HIPAR
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Cost comparison per lane km
45000
97000
0
20000
40000
60000
80000
100000
120000
HIPAR Mill & Fill 20% RAP
Source: BC MOT Study
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Project Selection Factors • Structural strength • Roughness • AC content not lower than 4.5% or greater than 6% • AC penetration not lower than 20dmm • In-situ air voids should not be less than 1% • Pavement defects
• Low to moderate density and severity
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Strategy #1 – 50 mm “stand alone treatment” • Proceed with HIPAR, then crack seal if they reoccur • Cost effective method to deal with raveling & rutting
Strategy #2 - 50 mm HIPAR with 50 mm overlay
Strategy #3 – Mill 50 mm / HIPAR 50 mm / Fill 50 mm
Thermal Cracking Strategies
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Project Selection Factors
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Yes No Yes
Moderate surface defects On the verge of a more rapid decline
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BC MOT HIPAR Study • Cost savings of up to 50% compared to mill & fill • Experiencing comparable life cycles to new HMA • Reduces Greenhouse gases by 30% to 40% • Reduces lane closure time by up to 75%
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Source: BC’S SUCCESS WITH HOT IN PLACE RECYCLING -‐ A 25 YEAR HISTORY by Daryl Finlayson, Ian Pilkington, P.Eng. of the BC MOT Connie Nicoleb, P.Eng. Vipin Sharma, P.Eng. Bernie Teufele, P.Eng. of EBA Engineering
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New Train Under Construction
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HEATER MILLER
TWIN SHAFT PUGMILL
REMIXER
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Thank you
www.ecopavesystems.com
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