Cold In Place Recycling

City of CharlotteSeptember, 2011

Amy E. Schoonover, PE Director of Public Works

Cold In Place Recycling• Tight

budget• Many

streets in need of repair

• Identified major and local streets that were candidates for CIR

Can We Use CIR?

• No utility work needed under the street• Evaluate type of distress that needs to be

addressed• Quality of the material to be recycled• At least 3 inches of asphalt

Background Information Needed

• Details of pavement that was originally constructed

• Thickness of as-built layers• Pavement cores

Construction Sequence

• Remove castings

• Recycle pavement

• Adjust structures

• Place overlay

Charlotte’s Project• 1.2 miles of 3

½-4” CIR (18,000 SY)

• Single train• Engineered

asphalt emulsion

• ¾” ultra-thin overlay

• Mikesell Street• Hall,

Washington, McClure Streets

Mikesell Street• Spartan

Motors main shipping entrance- dead end street

• Public school bus yard

• Schedule coordination to minimize construction impact

Mikesell Street• Last paving

1977• 3” HMA over

aggregate base

• 3” HMA + ½” base reclamation

• CIR = 3.8% engineered emulsion + RAP

• Ultra thin overlay

Mikesell Street

Before During After

Hall-Washington-McClure Streets

• Last paved 1988

• 4-6” HMA

• 4” HMA reclamation

• CIR = 2.8% engineered emulsion + RAP

• Ultra thin overlay

Minimal Disruption

Hall Street Washington St.

Quality Assurance• Material

gradation

• Emulsion addition rates

• Rolling patterns

• Density testing

• Resident/business notification

• City website• Facebook• Press Releases

Community Relations

CIR Advantages

• Environmentally friendly• Shorter construction time• Able to maintain traffic• Cost effective

Emission Comparison

Additional Resources

• Asphalt Recycling and Reclaiming Association (ARRA)

• http://www.pavementpreservation.org/toolbox/links/CR%20Brochure%20FINAL%2008-26-05.pdf

• Federal Highway Administration (FHWA)• www.fhwa.dot.gov/pavement/preservation/ppcl12.cfm

• Transportation Research Board• http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_syn_421.p

df

• Michigan’s Local Technical Assistance Program• http://www.michiganltap.org/bridge/26-1