Recycling of tunnel excavation using the example of the Koralm Tunnel, contract KAT2 – Status April 2015 / Verwertung von Tunnelausbruch am Beispiel des Koralmtunnels, Baulos KAT2 – Stand April 2015

Abstract

Contract KAT2 will produce about 8.6 m. t of material excavated from the tunnel. In the course of the design work, maximum reuse of this material was intended, always considering economics and while reducing the environmental impact by minimizing transport and saving resources. More than half of the suitable tunnel spoil will be preliminarily screened and then processed for the production of aggregates for concrete production. After the first year of production, the high losses associated with the preliminary screening and processing demanded measures to improve the processing, which led to an improvement of the recycling quota. The aggregates produced on site so far fulfil the technical requirements for concrete production, even for high strength concrete grades.