عنوان مقاله [English]
The prime coat is used to create a layer of bitumen to seal the base of roadways, protecting under-layers from water intrusion, binding the surface material, enhancing adhesion between unbound and asphalt layers, and preventing slippage between them. The presence of the solvent improves penetration of prime coat material through facilitating the capillary action. Because of environmental aspects, in this study, the cationic emulsion is produced with two different solvents, namely Kerosene and bio-solvent, with three different quantities, 0, 7, and 12 percent by emulsion. Penetration of produced emulsions in compacted base samples was evaluated in dry and wet condition. The results showed that the amount of solvent had a remarkable influence in the penetration of the bitumen emulsions and the solvent-containing emulsions had better penetration than emulsion without solvent. Also, the type of aggregate materials and their moisture content had a significant effect on the emulsion penetration, so that the penetration of emulsion in wet calcareous aggregates was more than dry calcareous and wet and dry siliceous aggregates.