In this session current methods for stabilisation like inorganic stabilisation with cement or vitrification, were presented. In addiction, current procedures in e.g. The Netherlands, France and Northern America, were high-lighted. In many countries, mainly for contaminated soil and waste materials for which no other process is available. In these cases environmental improvement is the driving force. The main conclusion, based on presented research data, is, that cement-based solidification processes are very promising.
Environmental studies indicate a good long term performance, based on model results.
In order to stimulate application of developed techniques, field experiments and demonstration projects need to be stimulated. This is also necessary in order to obtain guidelines and to derive legislation, aspects needed for a real break-through. return to top of page or contents 2.12 Policy and Economy. This leads to the conclusion that re-use of secondary materials still needs to be stimulated by governmental measures. Environmental economics, as presented by A. Craighill, England, support this conclusion. Furthermore it is necessary that standards and guidelines are being developed to support the application of secondary materials in the construction industry.