Sammendrag
There are more than 2000 completed road, railroad and hydropower tunnels in Norway, with a current annual production of more than 7 million solid cubic metres excavated rock. The road and railroad tunnels are consumers of concrete, which is utilised for rock support, water- and frost protection. A small portion of the excavated rock affiliated with Norwegian tunnelling is used as concrete aggregate, while the major part of the rock is used for landfill. This paper reviews the potential of utilising excavated rock obtained by tunnel boring machines (TBM) as concrete aggregates, including results from recent European TBM projects that have utilised the excavated rock for concrete aggregates. Finally we present test results from excavated rock material from two new (including one ongoing) Norwegian TBM projects. Particle Size Distribution (PSD) of the filler / fines fraction and effect of the fines fraction (
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