Patent ID: 7226501

Claim:
A method for manufacturing an aqueous bitumen-aggregate mix by mixing an oil-in-water bitumen emulsion containing an emulsifier, a mineral aggregate, additional water and a de-emulsifier at a temperature from 0 to 40° C., wherein the bitumen emulsion has a pH-value between 1–5 and the emulsifier contains a salt between a polyvalent phosphoric acid and a diamine of the formula where one or two of the groups R 1 , R 2 , R 4 and R 5 designate a hydrocarbon group of 6–22 carbon atoms, and the remaining R 1 , R 2 , R 4 and R 5 groups are an alkyl group with 1–4 carbon atoms, and/or a group —(A) s H, where A is an alkyleneoxy group with 2–3 carbon atoms, and s is a number from 1–4, and R 3 is an alkylene group with 2–4 carbon atoms and the de-emulsifier contains a hydraulic cement.