Large quantities of mineral waste from excavation, construction or demolition works are generated in Germany annually. In order to protect natural resources, it is required by German law to recycle and reuse as much of these materials as possible. While recycling of non-hazardous construction and demolition waste has already progressed to a certain point, a considerable amount of (natural) excavation materials is still being landfilled and deposited. Fine-grained soils with in situ water contents above the optimum compaction water content generally show poor engineering properties, therefore their properties need to be improved by soil treatment or they have to be discarded. At the Technische Universitaet Muenchen the use of demolition waste for the improvement of soft, fine-grained soils is currently investigated, combining both types of waste materials. This paper summarizes the results of experiments on two treated fine-grained soils, one clay of low plasticity and one of very high plasticity.
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