Presentation on construction best management practices for Cold-in-place Recycle (CIR) success, delivered by Dennis McElroy, FMG, at the CalAPA Fall Asphalt Pavement Conference, Oct. 24-25, 2018 in Sacramento, CA.

1. Construction Best
Management
Practices For CIR Success
DENNIS MCELROY
FMG DIVISION MANAGER
COLD IN-PLACE RECYCLING AND ASPHALT MILLING
www.FMGCoInc.com

2. Asphalt Recycling & Reclaiming Association
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3. CIR Is Not Hot Mix Asphalt!
Its not AC and its not AB. It’s really in-between.
Material properties are different and expectations should be
different.
As an industry we all need to have an open mind with these
materials.
We need to utilize the hard work others have done so we can
learn faster and use technology like this in more and more
areas.
PARTNERING
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4. Virginia Interstate 81 – CIR Project
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5. CIR - Erasing Crack History in the
Pavement
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6. Mill-and-Fill Example
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7. Good CIR Candidates
Cracking, Oxidized Pavement, Potholes, etc.

8. Good CIR Candidates

9. Requires good drainage and stable
subgrade.
CIR does not solve poor subgrade
conditions!
Good CIR Candidates

10. Full Depth Reclamation (FDR)
- Solves poor subgrade conditions

11. Urban Based CIR

12. Best Management Practices Starts
With Picking The Right Road At The
Right Time
▪ Need to verify
existing pavement
thickness in advance
▪ Understand your traffic
count & subgrade info
▪ Do a pavement design
▪ UC DAVIS PRC is a
great resource!

13. Equipment Used In the
Industry

14. Multi Unit Recycler Or “Train”
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15. Multi Unit Recycler Or “Train”
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16.  Windrow of
CIR material to
paving
machine
Single Unit Recycler
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17.  Rear conveyor
delivery of CIR
material to paving
machine
Single Unit Recycler
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18. CIR Single Unit Recycler Material
Processing
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19. Two Main Binder Types

20. Foamed Asphalt
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21. Emulsions
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22. IMPORTANT
Both binder types have similar long term performance
characteristics.
Each with their own specifications and specific test
methods.
DO NOT BLEND THE SPECS TOGETHER!
Caltrans NSSP’s (approved April 2018)
Section 30-5 CIR using Emulsified Asphalt
Section 30-6 CIR using Foamed Asphalt
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23. Where Do I Get The Proper
Specification?
Caltrans CIR homepage online was last updated:
06/15/2011
Talk to the CIR contractors or agency’s that have
already completed a project.
- Most of the contractors who specialize in CIR will
provide lunch and learn opportunities or will be
willing to share lessons learned.
- www.RoadResource.org is also a great resource.
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24. Critical! Before Starting A Project!
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JITT Training – Just in time training
This can be after samples have been pulled and a mix design has
been developed.
1. JITT training needs to be done before the work within the
pavement section begins.
2. Have the conversations that you don’t want to have.
3. Staging areas, Traffic handling, mix design, contingency plan,
on site contacts, who is responsible for what, concerns from
all sides, etc.
4. This meeting, with all parties involved, will set the tone and
expectations of the project.

25. 1. Lower Utilities
- Min. 3” below CIR depth

26. 2. Do Your Milling First.
Key cut and conforms need to be done before CIR if they are
within the area to be recycled.
IF YOU DON’T HAVE TO, DON’T MILL THE CIR SURFACE.

27. Profile And Cross Slope Adjustments

28. Typical Cross Section Detail
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29. Typical Cross Section Example
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30. Fog Seal Application
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31. Close-Up of Fog Seal
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32. Fog Seal Curing
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33. Close-Up of RAP Mat
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34. Cold Material – Minimal cross traffic, emergency vehicles and driveway
access is ok.
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35. Final CIR Surface Before The Overlay
Time between completion of
CIR and final surfacing:
Foamed Asphalt
Minimum: 2 to 3 days of
curing
Maximum: 15 days of
exposure to traffic
Emulsions
Minimum: Moisture 2% or
less.
Supplemental Compaction
Maximum: 15 days of
exposure to traffic
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36. Final CIR Surface Before The Overlay
What is Supplemental Compaction?
◦ Re-Rolling the entire CIR Surface
prior to smoothness testing or
final surfacing.
◦ After moisture loss due to curing
there are more air voids in the
mixture. Re-rolling the surface
takes out those voids.
Foamed Asphalt doesn’t require
supplemental compaction.
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37. Need to apply tack coat before the HMA
overlay is placed.
◦ A fog seal was applied on the final CIR
surface?
Overlay Install, Tack Coat applied
in front of paver & Final CIR Surface
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38. Cul De Sac Example
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39. Cul De Sac Example
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40. Cul De Sacs Contd.
Paved exterior of cul de sac
CIR Ties into new paved exterior of the cul de sac
And directly to the lip of gutter.
AC Paving was left 2” low along lip of gutter. NO milling required later.
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41. Point Reyes Petaluma Road – Marin
County
Shoulder widening
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42. Shoulder Widening with CIR
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43. Contact Info
Dennis McElroy
FMG Division Manager
Dmcelroy@Graniterock.com
Cell:408-639-8063
www.FMGCoInc.com