"Goals: 1. To determine if high-boiling liquids produced from coal liquefaction and oil shale retorting can be used in place of petroleum liquids as effective softening agents for recycling old or worn out asphalt paving materials. 2. To determine specific effects of these additives in a design analysis for recycled pavements. 3. To determine the combined effects of high boiling liquids produced from coal liquefaction and oil shale retorting when used in conjunction with water to reduce pollution emissions on the design of recycled asphaltic pavements."