innovative solutions for wintertime pavement maintenance and … · 2005-05-23 · preventative...
TRANSCRIPT
•1
Innovative Solutions for Wintertime Pavement
Maintenance and Repair
Presentation Outline• Introduction• Philadelphia• Pothole Types• Pothole History• Ditch History• Typical Repair Techniques• New Technology• Conclusion
•2
City of Philadelphia
• 2600 Center Line Miles• 50 miles of Limited Access• 390 miles State DOT
Responsibility• 2210 miles City
Responsibility• 60 miles SEPTA tracked
streets
City of PhiladelphiaStreets Department
Traffic
Street Lighting
Surveys
Highways
Transportation
Budget IT
Acct. Human Resr.
Administration
Collections
Recycling
Cust. Affairs
Sanitation
Streets Department
City of PhiladelphiaHighway Division
Administration
Planning & Contract Developement
Inspection
Construction
BridgeMaintenance
CentralMaintenance
DistrictMaintenance
Maintenance
Permitting
Inspection
Right of Way
Kevin KochChief Highway Engineer
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City of Philadelphia• Pothole Fighting
Deployment• 15 – 20 crews from
Highway Division• 2 Roadpatchers – City
owned• 3 Pothole Killers - rental• Asten-Cook Recycler• Patchmaster
Pothole Types
• Typical Pothole• Utility Cut Failures• Trench Degradation• Manholes• Surface Rail Problems
Pothole Variables in Philadelphia
• Amount of Snowfall During Winter Months• Number of Freeze/Thaw Cycles• Amount of Crack Sealing Performed• Size of Capital Program• Asphalt Plant Closures• Urban Problems
•4
Potholes and Ditches FY 1995-2005 (YTD)
44,893
81,098
36,295
21,87716,202 15,993
19,814
11,593
24,182 22,85816,174
6,029 5,872 7,222 8,853 8,836 6,743 5,661 7,2944,653 6,647 4,829
010
,00020
,00030
,00040
,00050
,00060
,00070
,00080
,00090
,000
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Fiscal Year
#
PotholesDitches
Potholes and Make Safes FY 2003
195 144 335724 699
1,136 1,392921
10,893
5,367
1,518858
109 94 172 260 254679 776 688
2006
674293 488
0
2,000
4,000
6,000
8,000
10,000
12,000
JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN
Month
No.
PotholesMake Safes
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Typical Repair Techniques
• Cold Patch/Super Patch• Hot Mix Asphalt
Typical Repair Techniques
• Cold Patch/Super Patch– Expensive, $68.00/ton– Temporary
• Hot Mix Asphalt
Typical Repair Techniques
• Cold Patch/Super Patch• Hot Mix Asphalt
– $27.45 / ton– Permanent– Not always available
•6
New Technologies
• Roadpatchers• Asten-Cook Recycler• Patchmaster
New Technologies
• Roadpatchers– 2 City Owned– 3 Rental Units– $78,750 / 3-month lease– Permanent Repair– Used in most weather conditions– Emultion– Asphalt and Concrete Surfaces
• Asten-Cook Recycler• Patchmaster
New Technologies
• Roadpatchers• Asten-Cook Recycler
– Portable– 1.5 Ton Capacity– Mix on Location– 20 – 30 minutes to heat– Use Year-round
• Patchmaster
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New Technologies
• Roadpatchers• Asten-Cook Recycler• Patchmaster
– 5 tons of Asphalt on board– Useful for Utility Cuts and Trenches– Operate Remotely– Use All Year Round– Expensive
Conclusion
• Looking for New Technology• Expanded Fleet of Portable Recyclers• Aggressive Crack-Sealing Program• Lobby for Larger Resurfacing Budget• *-Fix• CAIS
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Presenter
Kevin M KochChief Highway Engineer
City of PhiladelphiaRoom 940 - MSB Building
1401 JFK Blvd.Philadelphia, PA 19102
Winter Pavement Maintenance,A Best Practice Method
North American Snow ConferenceKansas City, MOApril 17, 2005
Terry Ream, CPWSSenior ForemanPavement ManagementCity of Edmonton
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Winter Pavement Maintenance,A Best Practice Method
North American Snow ConferenceKansas City, MOApril 17, 2005
Terry Ream, CPWSSenior ForemanPavement ManagementCity of Edmonton
53o 35” N. Latitude
City of Edmonton
City of Edmonton
• Population– Edmonton proper: 680,000– Edmonton region: 1 million (Dec. 2004)
• Area– 700 km2 (270 miles2)
• Roads– 4,538 km (2,820 miles)
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City of Edmonton
• Sidewalks– 4,281 km (2,660 miles)
• Weather– Average snow 129 cm (51”)– Average snow storms 9– Average freeze thaws 100– Freezing rain days 8– Average winter temp. -150C (+50F)– Average max. low temp. -340C (-300F)
City of Edmonton
• Potholes– Averaging 450,000 per year
City of Edmonton
• In the early 1980’s, the City of Edmonton developed a“Best Practice Method” to address winter asphalt maintenance
• Permanent repairs were to be made 12 months of the year using HMA
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City of Edmonton
• Why?– The increasing damage to existing
infrastructure by using ineffective “temporary” repairs
– The high cost of continually maintaining temporary repairs throughout the winter
• Potholes, cracking• Utility cut repairs (at the time we were
dealing with approx. 150 water break cuts per week, prior to an aggressive cast iron main replacement program in the nineties)
City of Edmonton
• Why?– The high cost of deferring permanent
repair to the summer season
City of Edmonton
• How?– A decision was made to winterize the
City’s existing Asphalt Plant to supply pothole and utility cut crews with HMA
– Procedures were developed for asphalt placement in temperatures to -300C(-220F)
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City of Edmonton
• How?– As summer supply demands grew, a
decision was made to contract that supply and operate the existing asphalt plant during the winter months only
– Winter operations were offered for outsourcing, no takers, kept in-house
Best Practice Method
• 10 HMA potholes crews year round for permanent repairs
• Crew consists of 1 foreman, 3 skilled labourers
• Trucks are custom designed combination units
Custom Combination Unit
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Plate tamper lift
Tool storage
Propane Tank
Hot tar tankHeated tool storage
Airline connection to 150 cfm in-line compressor
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Plow mount for multi-use
Basic Procedure
• Prepare all potholes for HMA placement in the following manor:– Excavate using cold mill planer or
jackhammer, to stable adjacent structure
– Square off angles for optimum density– Straight, clean, dry vertical edges– DO NOT use heat to prepare pothole
Basic Procedure
• Prepare all potholes for HMA placement in the following manor:– Tack sides and bottom with hot
AC 150 – 200– Place and compact asphalt in
50mm – 100mm (2” – 4”) lifts using a vibratory plate tamper or 2 tonne roller
– 2 tonne roller used on all final lifts
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Basic Procedure
• Prepare all potholes for HMA placement in the following manor:– Seal edges with hot AC 150 – 200– Spread evenly using a hot iron, overlap
edges by 100mm (4”)– Potholes under 1 m2 (1.2 y2) should
have the entire surface sealed– Immediately cover with clean dry sand
Tack Coat
Asphalt Placement
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Compaction
Sealing
Basic Procedure
• Utility Cut placement is the same preparation is different:– All edges are to be saw cut– Backfill is to be fill-crete– Structure depth
• 150 mm (6”) lanes and locals• 225 mm (9”) collectors and industrial• 300 mm (12”) arterials and freeways
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Spring Thaw
• During the spring pothole season HMA crews are supplemented with:– 5 trailer type hot boxes for HMA or cold
mix– 4 high output trailer type spray patchers– Cold mix crews. Cold mix used is
PAP (HF 1000)
Preventative Maintenance
• Preventative maintenance will help to limit the amount of winter repairs:– Summertime
• Effective overlay/rehab program• Crack sealing program, rout & seal
recommended• Pothole/handpatch program• Ditch/overland drainage maintenance
Preventative Maintenance
• Preventative maintenance can help to limit the amount of winter repairs:– Wintertime
• Effective plowing program• Snow removal program• If stacking snow on road ROW consider:
– Drainage/crossfall– Leave gutters free/boulevard stack– Stack for maximum melt
(north side vs. south side)
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Best Practice Method
• The City of Edmonton has tested new technologies, new materials and has determined that the previous procedure is still the “Best Practice Method” for the local climate and conditions