Illinois Center for Transportation

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This report presents the sustainability efforts of the Illinois Department of Transportation (IDOT) in

recycling and reclaiming materials for use in highway construction. This report meets the requirements of

Illinois Public Act 097-0314 by documenting IDOT’s efforts to reduce the carbon footprint and achieve

cost savings through the use of recycled materials in asphalt paving projects. This report also covers the

development, construction, and initial performance after one winter of demonstration projects that used

total recycle asphalt (TRA). TRA may consist of reclaimed asphalt pavement (RAP), recycled concrete

material (RCM), steel slag, reclaimed asphalt shingles (RAS), and less than 3% new soft liquid asphalt.

No newly mined aggregate is used in the mix. The results of Hamburg wheel tracking and Semi-circular

bending (SCB) for fracture energy are presented for durability aspects of both rutting and pavement

cracking on three demonstration projects that used TRA mix. Crack surveys were performed to establish

early performance history of the TRA mixes. Included in this report is an environmental evaluation of 16

mixes including the TRA mixes used on the three demonstration projects.

US Transportation Collection

R27-160