Presentation delivered by Frank Farshidi, Ph.D., P.E., City of San Jose, at the CalAPA Fall Asphalt Pavement Conference Oct. 24-25, 2018 in Sacramento, Calif.

1. Frank Farshidi, Ph.D., P.E.
October 25, 2018
Cold-in-Place Recycling (CIR) use inCold-in-Place Recycling (CIR) use in
Urban AreasUrban Areas

2. Common Challenges in most
urban areas
• Limited capital and human resources
• Increasing expectations of public and policy makers
• Increasing environmental sustainability awareness
• Increasing traffic volume on current streets and roads
• Pavement segments that need major rehabilitation:
block cracking, wheelphath cracking, oxidized
surfaces, utility cuts, and rough pavement sections

3. Traditional Pavement Treatments
• Simple Overlay
• Thin Mill and overlay
• Thick Mill and Overlay
• Digouts and overlay
• Major Reconstruction of roads down to the
Subgrade
• Combining preservation and rehabilitation
(i.e., two layer systems, three layer systems,
and etc)

4. Desired Outcome
• Long Lasting Pavement Life
• Smooth ride for all users
• Cost effective and optimized solutions
• Minimum environmental footprint
• Maximum Reuse of existing Materials and
Resources ( 100% RAP)

5. CIR-foamed Technology
• Pulverization of up to 6 inches
of pavement segments
• 100% RAP
• Recycling at Ambient
Temperatures (day and night)
• Cost Effective from LCCA
perspective

6. CIR-Foamed Components
Asphalt Binder
Existing Pulverized Material
Water
Mineral Filler (cement)

7. Design Phase Steps
Phase 1
Initial assessment (traffic analyses, pavement condition/IRI)
Initial Design Analysis (Coring / GPR / Deflection Testing / LCCA)
Phase 2
Laboratory Testing (materials properties, mix designs)
Mix Design and Specification Development
Phase 3
Engineer’s Estimate and Final Project Specifications/plans

8. Mix Design and QC/QA

9. City of San Jose-2017 Projects
• 2,412,000 SF of 4” Cold-In-Place Recycling ( i.e., 38
lane miles of streets)
• Asphalt Binder – PG 64-10 (2.5 to 3%)
• Percentage of Cement – 1%
• Water: 2-3%
• Reduced Payment Factor for compaction and wet ITS
(98% Compaction required per CTM 216 method and
300 KPa for wet ITS)

10. Spreading 1% of Cement prior to
Recycling

11. Recycled Material Loading into the Paver

12. 4” Cold-In-Place Recycle on Camden Ave

13. Off hauling excess material in order to maintain the
correct grade of the road

14. Compaction of CIR
• Minimum Compaction requirement of 98%
• We achieved compaction utilizing two 12 Ton steel drum
vibratory rollers
• A 25 Ton pneumatic roller is used to prepare the roadway for
traffic

15. Compacted section ready for Traffic

16. Apply Fog Seal (SS1 50/50) and Sanding
prior to opening the lane to traffic

17. Construction Uncertainties

18. QC Density Requirements
• Gauge Measurements
• 3 per 250 tons or 3 per paving day,
whichever is greater
• 2 cores per paving day

19. Thank you
949-690-1411
Frank.Farshidi@sanjoseca.go
v
Questions ?