Cold Bituminous Pavement Recycling, US-56, Pawnee County, Kansas

摘要

A study was undertaken between 1977 and 1991 to construct and monitor some coldrecycle sections. Five different test sections and one control section were completed in 1977 and monitored for cracking for approximately 14 years. The control section consisted of widening the roadway to 24' with hot mix, then placing a normal 4 inch hot mix overlay. The five test sections consisted of cold recycling approximately 6 1/2 inch of old pavement using various additives (MC-800, Portland Cement, and AC-7), followed by a 3 inch hot mix overlay. In 1991 the project was again overlayed which terminated the monitoring period. The cracking in each section had progressed to 100% of its original condition, thereby allowing determination of the life of each section. A cost analysis was completed but was based only on the amount of cracking in each section. The report concluded that the 6 1/2 inch cold recycle with a 3 inch hot mix overlay was cost effective in reducing the amount of cracking when compared to a 4 inch hot mix overlay. Wheelpath rutting was not a major problem during the study.