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Ποιοτική αναβάθμιση ανακυκλωμένων αδρανών από ΑΕKΚ με χρήση μικροκυμάτων

Kontokalos Anastasios

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Summary

Construction and demolition waste (CDW) are one of the heaviest and most voluminous waste streams generated. Indicatively in Europe, it accounts for 25%-30% of all waste generated. It consists a lot of materials such as concrete, ceramic, gypsum, wood and more, most of which can, and must, be recycled for they originate from natural, not renewable resources. Τhe construction industry, from which CDW derive, make up for one of the biggest consumers of natural products worldwide. The imprudent excavation and use of such materials to produce building materials and later on the disposal of those same materials, constitute one of today’s important environmental issues. One of the measures to address this issue lies in the recycling and reuse of CDW, for which targets have been set by the European Union for all each member states, including Greece. The object of this thesis is to investigate the possibility of producing sand from recycled concrete for the production of cement mortar products and to upgrade its properties by applying a new technique assisted by microwaves. Initially, the sources and characteristics of the waste are analyzed and statistics are presented regarding the recycling and reuse of CDW in Greece and the European Union. Then basic information is given about microwave heating and how it affects the separation of the two main constituents of concrete (aggregate and binding material). The largest part of the work, however, concerns the applied processing and separation methods of CDW for the production of recycled aggregates. Particular emphasis is placed on the recycling of the above aggregates as well as how they affect the characteristics and strengths of the cement mortars produced.Finally, the conclusions resulting from this work are presented and proposals which emphasize in the of the recycling and reuse of CDW in the construction industry are suggested.

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