Often upgrading an aged asphalt concrete pavement involves overlaying a cracked pavement with new asphalt concrete. However, usually the substrate cracks reflect through the new overlay under repeated service loading. Full depth cold-mix recycled asphalt concrete is an alternative eliminates the potential for reflective cracking.
Generally, the performance of cold-mix recycled asphalt concrete pavements in the United States supports its use as base course in flexible pavements. The conditions of three Washington experimental "cold-mix" pavements after about 6 years of service varied from fair to good, depending on the level of truck traffic. The wheeltrack rutting of those pavements was not significantly different from rutting that might be expected from conventional flexible pavements under the same conditions. Although the potential for fatigue cracking exists, as it does in conventional flexible pavements, full depth recycling of asphalt concrete eliminates the cause of reflective cracking.
September 21, 2007
Khossrow Babaei, J. P. Walter.
Washington State Transportation Center (TRAC)
- # of Pages: 70 p., 1,256 KB (PDF)
- Subject: Asphalt concrete, Base course (Pavements), Cold mix paving mixtures, Cold weather, Evaluation, Flexible pavements, Pavement performance, Recycled materials, Recycling, Reflection cracking, Rutting, Ruts (Pavements), Trucks.
- Keywords: Asphalt, cold-mix recycling, pavement, asphalt concrete, reflective cracking, Washington (State)
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This abstract was last modified April 29, 2008