Netherlands is setting standards
Although there is the DAfStB guideline for recycled aggregates in Germany, which regulates the use of defined recycled aggregates for partial use in concrete and mortar; there are no regulations for the use of incinerator bottom ash. In Germany, a building supervisory approval or an approval from the German Institute for Building Technology (DIBt) is required for individual cases.
The Netherlands is considerably more progressive – having already created such a regulation, namely the CUR Aanbeveling 116 directive introduced in October 2012, which defines the use of IBA as an aggregate for concrete. In combination with European standards, there is great potential for application. more on the standards

Dutch production of concrete products with incinerator bottom ash