The 25 papers presented at the National Seminar on Portland Cement (PCC) Pavement Recycling and Rehabilitation are reproduced in this report. The seminar was held in St. Louis, Missouri, September 27-30, 1981, and was attended by 219 people from national, state, and local governments, as well as industry and academia. These proceedings cover all aspects of PCC pavement recycling and rehabilitation, including condition surveys, jacking, drainage, joint repair, profile correction, bonded overlays, and load transfer restoration for both urban and rural situations. Cost and energy considerations, specifications, quality control, and environmental considerations were addressed. Equipment of all types was discussed and research currently underway was reviewed.

Interest in hot mix recycling has recently been stimulated by:rising cost of asphalt cement and fuels; depletion and risingcosts of readily available conventional aggregate resources; theneed to reduce energy consumption; reduction in available fundsfor transportation facilities due to inflation; and, environmental problems due to mining of aggregate materials. Since hot mix recycling can offer advantages in all these areas, the overall objective of this project is to encourage the use ofthis cost and energy efficient strategy in the rehabilitation andmaintenance of pavements in the national road system.

This synthesis will be of interest to pavement designers, construction engineers, and others interested in economical methods for reconstructing or rehabilitating bituminous pavements. Information is provided on the processes and procedures used by a number of states to recycle asphalt pavements in place without application of heat. Since 1975 a growing number of state highway agencies have reconstructed or rehabilitated asphalt pavements by recycling the old pavement in place. This report of the Transportation Research Board describes the processes used for cold in-place recycling, including construction procedures, mix designs, mixture properties, performance, and specifications.