Bitumen surfactant

[grumblebum]

I have a quantity of Bitumen Profilings (the stuff they mill off the road surface before re-laying the topping). I want to re-use the profilings and would like to know if anyone can suggest additives to rejuvinate the bitumen. My thoughts are that there may be a type of surfactant which can be mixed with water and added to the crushed profilings.
Bitumen emulsion works well, as does petrol, but they are too expensive.

Thanks.