Abstract:
An effective use of limited space in existing waste disposal sites is highly needed due to the
difficulty in constructing new facilities in Japan. The control of compaction and consolidation properties
of waste materials is important to reduce disposal space. Correspondingly, studying on shear strength
properties is essential in order to take precautionary measures against potential failures such as slope
instability. In this study, geotechnical properties such as maximum dry density, compression index,
and friction angle were investigated for mixed waste materials of sludge (D<2.0mm), crushed concrete
(2.0mm<D<9.5mm), and incineration ash (D<2.0mm) with different mixing proportions. Mixed samples
of sludge and crushed concrete and/or incineration ash showed almost same compaction
characteristics and friction angle. However, completely different results between the mixed samples of
sludge and incineration ash and the mixed samples containing crushed concrete were observed. The
compression index was significantly decreased with decreasing the mixing proportion of sludge in
case of adding the crushed concrete. Therefore, it is highly important to mix the crushed concrete for
increasing the strength of waste materials.
