Cold In-Place Recycling

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Evaluation Of Long-term Field Performance Of Cold In-place Recycled Roads: Field And Laboratory Testing


Center for Transportation Research and Education


Study examines 24 CIR asphalt roads constructed in Iowa from 1986 to 2004. Research finds that sample roads with good subgrade support have 36% longer service lives than roads with poor subgrade support in addition to revelations in varying factors affecting performance in CIR between high and low traffic roads.


Sponsored by: the Iowa Highway Research Board (IHRB Project TR-502) and the Iowa Department of Transportation (CTRE Project 03-160)