Conewago Road Cold-in-Place (CIP) Recycling & Overlay

May 31, 2017

Dover Township has contracted with Kinsley Construction Inc., to recycle and pave Conewago Road (between Fish & Game and Piney Hollow Roads). The work is contracted to be completed before August 18, 2017, but the contractor has indicated that, weather permitting, they may start as early as next week.

Cold-in-Place (CIR) recycling is a method of removing and reusing the existing asphalt surface. It involves grinding off the top 5 inches of the existing asphalt surface and mixing the crushed asphalt with an asphalt recycling agent (emulsion), and placing it back down with a paver. Asphalt deficiencies were determined by sampling and testing the existing asphalt material prior to bidding the process.

The cold-in-place process is typically performed using a “train” of equipment which includes an emulsion tanker, milling machine, and an asphalt paver and a combination of rollers.

Cold-in-place road surfacing being applied by a crew wearing green shirts, blue jeans and hardhats.
Cold-In-Place ‘Train’

Cold-in-place recycling is used to restore and reuse the existing material reducing the amount of outside material required to be hauled to the site. This efficiently improves the road surface and strength while minimizing expenses typically incurred during the paving process. In addition, CIP can correct deep asphalt defects such as rutting, fatigue (alligator) cracking, and utility cuts that cannot be addressed by a surface treatment or an overlay, and allows minor corrections to the profile of a road surface, reduces reflective cracking, and results in a minor inconvenience to traffic. As its name implies, this is a cold process that requires minimal additional heat during the rejuvenation of the asphalt material, resulting in a decrease in the amount of energy required to produce the final material.

Because this is a “cold” process the material is slightly more porous than one would have from a hot mix material; it will be covered with a two inch asphalt overlay to protect it from water intrusion and to extend the life of the material. According to an FHWA study findings for New York State, a “CIR (4”) with a 1.5 inch overlay is expected to last 10-15 years with little maintenance as compared to a 5-8 year life of a traditional 1.5 inch overlay”.

Throughout this project, plan on short delays within the work zone and please remember we all are responsible for driving, walking, and biking, safely through any work zones.

Thank you.

 

Michael H. Fleming

Public Works Director