Abstract: This is a process and composition related to recycling old asphalt pavements into new pavements. It is accomplished by adding a special asphalt emulsion to the crushed old asphaltic pavement material without requiring the addition of new aggregate or heating. The old material is cemented at the ambient temperature into a new durable composition of high stability and water resistant without rejuvenation, softening or other appreciable change in the old asphalt, such steps being eliminated by selection of the degree of hardness and character of the asphalt base stock in the special emulsion.

Abstract: An asphalt base stock comprising a solvent refined asphalt having a penetration less than 25 and low ductility mixed with an asphalt cement. The base stock has a low penetration, 25-45, but unexpected high ductility, 150+. The base stock is especially suited for emulsification. When mixed with soils and aggregates, as for road surfaces, the stabilized product exhibits a significant increase in bearing strength over comparable asphalt-emulsion pavements and hot-mix asphalt pavements.