Pavement Maintenance A Concrete Alternativenorthernca.apwa.net/Content/Chapters/northernca... ·...
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Pavement Maintenance – A Concrete Alternative 20 th Annual Public Works Conference November 2nd, 2016 Presenters: Victor Cervantes, E.I.T. – CEMEX Michael Smith - Somero Ent. 1
Transcript of Pavement Maintenance A Concrete Alternativenorthernca.apwa.net/Content/Chapters/northernca... ·...
Pavement Maintenance – A Concrete Alternative
20th Annual Public Works Conference
November 2nd, 2016
Presenters:
Victor Cervantes, E.I.T. – CEMEX
Michael Smith - Somero Ent.
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Outline:
• Design • Rebar • Base
• Machinery
• Curing & Joints
• Finishes
• Drainage
• Construction
• Environmental Sustainability
• Overlays – a second chance
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Bellefontaine, Ohio – 124 Year Old Concrete Pavement
Do I Need a Base or Subbase???? It Depends!
Source: American Concrete Pavement Association – Subgrades and Subbases for Concrete Pavements
• Concrete is really strong • Concrete distributes loads over a large (panel) area – lowering stresses below it • Concrete does not NECESSARILY need base
Questions to Ask: • Does the existing soil provide a good enough working platform? • Is your traffic light-duty or slow moving? • Does my soil shrink or swell a lot? • Will the soil expand when frozen?
Photo source: The Teaching Channel.com
Do I Need Rebar????
ACI 330R-08
Machinery
FedEx truck terminal Toledo, Ohio 2013: Concrete alternative cheaper than asphalt Project thus converted from asphalt to concrete
1 million square feet of external paving 6½ inch truck area, 5½ inch employee parking
Curing & Saw Cutting Improves Performance
• Ensure uniformity
• Apply as soon as possible
• Improves surface durability
Curing Saw Cut & Fill Joints (Where Necessary)
• More aesthetically pleasing
• Recommend sawing within 2 - 6 hours
• Spacing: Max 36 times thickness
Joint Layout Is Crucial To Performance BAD Jointing Practices
Joint Layout Is Crucial To Performance Good Jointing Practices
The Other Reason to Saw Cut
5.0 ft 5.0 ft 5.0 ft
15.0 ft
What If This Is Hard?
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• Steel trowels are a NO - NO
• Keep it simple
Finishes
Drainage is Key
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Problems: • Freeze/Thaw • Pumping/Faulting • Base Failure
Cause: • Water entry and expansion upon freezing • Water entry moves fine soil between panels • Water entry that makes soupy soil = bad support
Solution: • Proper drainage and air entrainment • Proper drainage and load transfer • Proper drainage and good engineering
How Do I Build That?
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• Keep your drainage – use good jointing
Photo source: Norwood Concrete Cutting
Dual Slope Slab
The Easy Drainage Projects
What About Something Like This?
Image: US EPA
• Nighttime illumination differs
Enhance Safety
Illumination is roughly proportional to solar reflectance
Source: Pomerantz, M., et al (2003)
• Reduced energy for street lighting • Lower the wattage
• Remove 25% of the lights
Energy Savings
27 light fixtures
Source: Stark, R.A. (1986)
39 light fixtures
Dark pavement Light pavement
=
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Have an Existing Facility Like This?
Put Concrete Right on Top - Overlay
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Addressing Elevations – Keeping Drainage
Opt. 1 - Mill Required Depth at curb Depth is Adequate for Light Traffic Opt. 2 - Mill partial depth & bond to obstruction (Transition & truck areas) Opt. 3 - Transition slab – Transition & truck areas
PCC
Curb & Gutter (Wheel Chair Ramps, Entrances, etc.)
PCC
Transition Slab 1 or more panels
PCC
How To Perform A Utility Repair Un - Doweled
Saw cut T/4
Or, Do It The Fast Way & Use Technology
Photo: Crystal Chatham/The Desert Sun
Palm Springs City Hall - Before After
Photo: Madrid Corporation – Concrete Contractor
• Laser screed used = 10’s of thousands of SF per pour • Fibers allowed extended joint spacing • SRA also used to reduce water and shrinkage/cracking
Koke Mill Subdivision Springfield, Illinois 26 Years and Running
Resources: • National Concrete Pavement Technology Center
• Portland Cement Association
• American Concrete Pavement Association
• Lawrence Berkeley National Laboratories
• MIT Concrete Sustainability Hub
• American Concrete Institute
• California Nevada Cement Association
Somero Enterprises
Michael D Smith
West Territory Manager
(916) 474-0283
www.somero.com
We are Passionate about Your Success!
CEMEX
Victor Cervantes, E.I.T.
Pavement Solutions Engineer
(310) 721 - 8367
www.cemexusa.com
“Concrete is ALWAYS and Option”
