TEN YEAR PERFORMANCE ASSESSMENT OF THE LETHBRIDGE TEST PAVEMENTS DESIGNED TO MITIGATE INSTABILITY RUTTING

1
Western Canadian Experience with New and
Innovative Pavement Surfaces
Art Johnston Canadian User Producer Group for
Asphalt Charlottetown, Prince Edward
Island November, 2006
2
(No Transcript)
3
MANITOBA INFRASTRUCTURE TRANSPORTATION

• RECENT EXPERIENCE
• 2005-06 Using PG 58-34 for all New Construction
  
• Waived Elastic Recovery Requirement in 2006
• 2002-06 Incremental Increase in Micro-surfacing
  Program
• Other than some bleeding in 2003 Projects, Good
  Performance
• ISSUES
• Initially limited Contractor Capability for
  Micro-surfacing, now better
• Suitable Aggregates for Micro-surfacing has been
  a problem (resulting in increased cost)
• FUTURE INIATIVES
• Planning for CIR Surface Treatment for low
  volume road applications in 2007

4
CITY OF WINNIPEG

• RECENT EXPERIENCE
• Two Pilot Projects completed with ARA
  (Anti-Rutting Additive) Incorporation of clean
  5mm minus Limestone Chips to Improve Rutting
  Performance at intersections
• Good Performance after Three Years
• Incorporating 10 RAP in Mixes for Residential
  Renewal Projects
• Performing equal to or better than Standard
  Mix
• ISSUES
• Increased Material and Labour
• Costs (20 - 30 in 2006)

5
(No Transcript)
6
BRITISH COLUMBIA MINISTRY OF TRANSPORTATION

• RECENT EXPERIENCE
• 2006 Superpave Coarse Grading w/ PG 70-22
• High Traffic Border Crossing
• 2004 Asphalt Rubber Project (CTAA 2005)
• Significant Cost Premium
• 2003 Small SMA Demonstration Project (Victoria
  Region)
• Draindown / Temperature Problems (No Fiber)
• -2006 - Several OGFC Projects (CTAA 2001)
• Over 10 Years of Experience, Positive Results
• Several Micro-Surfacing Projects (CTAA 2005)
• Good Performance
• Seal Coat w/ Polymer Modified Emulsion Project
• Mixed Reviews, Some Bleeding

7
BRITISH COLUMBIA MINISTRY OF TRANSPORTATION

• ISSUES
• Superpave Mixes now specified for 30 of Projects
• Coarse Graded only, not interested in Fine
  Graded
• Quality Aggregate in Lower Mainland (No Cost
  Premium)
• PGAC on only a few projects
• FUTURE INIATIVES
• OGFC Surfacing will be used on the entire
  Sea-To-Sky Highway (including bridge decks)

8
CORPORATION OF THE CITY OF DELTA

• RECENT EXPERIENCE
• 2003 Open Graded Friction Course
• One Superpave Coarse Graded mix for Truck Route
• Good Performance, Improved Safety
• ISSUES
• Storage for Specialty Binders and Issue for
  Contractors
• Increased Costs for Small Quantities of Specialty
  Mix (up to 60 Premium)

9
CITY OF VANCOUVER
RECENT EXPERIENCE 2004-05 Use of PG 76-22
Modified Binder ISSUES Use of RAP Western
Canadian User-Producer Exchange, Issue No. 1,
Novemeber 2005
10
CITY OF KELOWNA

• RECENT EXPERIENCE
• 2004 Superpave Fine Graded w/ PG 76-28 used on
  two Highway 97 Intersections
• Very Good Performance, Minimal Rutting
• 2006 Continued Use of Superpave Fine w/ 80-100
  A
• ISSUES
• In Some Cases Contractor Capability for Superpave
• Suitable Aggregates and Binders have been
  available, but Increasing Costs are a Concern
• FUTURE INIATIVES
• Interested in Warm Mix Asphalt

11
(No Transcript)
12
SASKCHEWAN HIGHWAYS TRANSPORTATION

• RECENT EXPERIENCE
• 2005 20km Asphalt Rubber Project
• Positive, Reduced Reflective Cracking
• 2005-06 Thin Lift HMA Overlays on High Volume
  Roadways
• Generally Good
• 2006 1st Washed Chip Seal w/ CRS Emulsion
• Early Indications Positive
• ISSUES
• Asphalt Rubber Blending Capability Now in
  Province
• Increased Use of Manufactured Aggregates
• FUTURE INIATIVES
• Asphalt Rubber R D (Various Thicknesses)

13
CITY OF SASKATOON
RECENT EXPERIENCE 2004 - Thin Lift Overlays
(20mm) using PMA Extensive use of
Micro-surfacing since 1998 High Stability Mixes
w/ various PGAC (including PMA) for Arterial
Streets PMA Bridge Mastic Mixes Western
Canadian User-Producer Exchange, Issue No. 1,
Novemeber 2005
14
CITY OF REGINA

• RECENT EXPERIENCE
• Using Modified Binders on Major Roadways for past
  8 years with Aggregates meeting Superpave
  Requirements
• Initial Performance Positive, Reduced Reflective
  Cracking
• Using 100-120 mm Replacement Depth for
  Intersection Treatments
• ISSUES
• Difficulties with Hand Work using Superpave Mixes
  and Compaction needs to be completed quickly
• Fumes Identified as an Issue on Hot / Calm Days
• FUTURE INIATIVES
• Considering Crumb Rubber Mix
• Pilot Project

15
(No Transcript)
16
ALBERTA INFRASTRUCTURE TRANSPORTATION

• RECENT EXPERIENCE
• Modified Binders PG 54-34, 58-37, 70-28, 76-31
• Generally Positive Experience (CTAA 2006)
• 2002-06 Asphalt Rubber Gap Graded
• Very Expensive and No Improved Performance
• Two 2004 Projects Failed (raveling) requiring M
  I
• Chip Seal with Polymer Modified Emulsion
• Positive
• Micro-surfacing Rut Filling Surface Treatment
• Surface Treatment (Service Period 4-6 years)
• Superpave Mixes discontinued in 2001 (CTAA 2006)

17
ALBERTA INFRASTRUCTURE TRANSPORTATION

• ISSUES
• Asphalt Availability an Issue in 2006
• Contractor Capability Aggregate Availability
  seen as issues for mixes such as SMA
• Cost of Modified Binders makes it difficult to
  justify based on LCCA
• FUTURE INIATIVES
• Continue to Explore Options
• Including SMA for Intersections

18
CITY OF LETHBRIDGE

• RECENT EXPERIENCE
• 2006 Superpave Fine Graded w/ PG 64-28
• 2002 Asphalt Rubber w/ 150/200 A
• Poor Initial Performance (Raveling)
• 2002-05 Terminal Blend Rubber Modified Binder
• Good Performance
• 2002 2005 SMA w/ PG 70-28
• Very Good Performance
• Superpave Coarse Graded and
• Fine Graded (PG 70-28, 150/200)
• Specified for All New
• Major Road Construction

19
CITY OF LETHBRIDGE
ISSUES Non-PMA Binders Being Used to Reduce Cost
Premium Partnering Shared Risk Approach used
for Implementing Specialty Mixes (e.g.
SMA) FUTURE INITIATIVES Examine Appropriateness
of Superpave Moisture Susceptibility
Criteria Examine Reduced Design Gyrations (75 for
lt 5 Million ESALs)
20
CITY OF CALGARY

• RECENT EXPERIENCE
• SMA, Superpave Coarse Fine Graded, Asphalt
  Rubber (Wet Dry Process, Sulphur Extended
  Asphalt Modifier, Manufactured Shingle Modifier,
  Warm Mix Asphalt (CTAA 2006)
• Good Rutting Performance with SMA
• Good Overall Performance with Asphalt Rubber
  discontinuation of subsidy could effect future)
• Good Performance with PG 70 76, but more use
  of PG 64-31 (lower cost premium) Superpave Fine
  (PG 64-31) designed with 75 Gyrations has worked
  well
• Superpave Fine designed to 100 gyrations have
  been inconsistent in performance (low AC,
  raveling)
• Concern with emissions with SEAM,
• no advantages evident
• (still can smell 2 years later)

21
CITY OF CALGARY
ISSUES Cost Premium with Premium Mixes
(performance experience justifies
cost) Contractor Capability Typically not an
Issue (inconsistent performance once or twice a
year) Cost Escalation and Lack of Bidding
Contractors FUTURE INITIATIVES Goal is to work
towards a long term strategy for regular and
premium mix applications
22
CITY OF EDMONTON

• RECENT EXPERIENCE
• Superpave w/ PG 54-34 PMA I
• Poor Rutting Performance with PMA I
• Asphalt Rubber w/ 150/200 A 80/100 A
• Poor Performance Initial 2 Years (Raveling)
• Recent years may be better
• Some Constructability Issues / Placement
  Temperature
• SMA w/ PG 70-28 PG 76-28 (CTAA 2004)
• Excellent Performance on High Traffic
  Applications (Yellowhead Trail,
• Whitemud Dr.
• and Intersections)

23
CITY OF EDMONTON

• ISSUES
• Aggregate Quality is an issue in Edmonton
• Aggregate Cost Premium for Specialty Mixes
• Quarried SMA Aggregate Imported
• PMA Binder Cost, and in some cases availability,
  a issue
• Contractor Capability an issue with new products
  until comfort level gained May have caused some
  past problems
• FUTURE INIATIVES
• Currently looking at Warm Mix Asphalt as a
• potential new process

24
Leonnie Kavanagh Manitoba Highways Darwin
Kupskay City of Winnepeg Magdy Beshara
Saskatchewan Highways Transportation Harlan
Ritchie City of Regina Mike Oliver BC
Ministry of Transporation Bill Mahoney City of
Kelowna Harold Fograscher Corporation of the
City of Delta Chuck McMillan Alberta
Infrastructure Transportation Ken Yeung City
of Calgary Hugh Donovan City of Edmonton
25
THANK YOU
Leonnie Kavanagh Manitoba Highways Darwin
Kupskay City of Winnepeg Magdy Beshara
Saskatchewan Highways Transportation Harlan
Ritchie City of Regina Mike Oliver BC
Ministry of Transporation Bill Mahoney City of
Kelowna Harold Fograscher Corporation of the
City of Delta Chuck McMillan Alberta
Infrastructure Transportation Ken Yeung City
of Calgary Hugh Donovan City of Edmonton