A process is provided for the remediation of bottom ash from domestic waste incinerators which comprises hot mixing from 10 to 50% by weight of said bottom ash with from 4 to 6% by weight of bitumen having a penetration of from 50 to 200 pen, from 25 to 55% by weight of crushed rock having a particle size greater than 2 mm, from 10 to 35% by weight of crushed rock fines having a particle size of less than 2 mm and from 0 to 3% by weight of a filler to give a hot mix asphalt product which is environmentally stable and which has load bearing properties at least as good as conventional hot mix asphalts.