Host: Japan Society of Material Cycles and Waste Management
Steelmaking slag is a byproduct of steel industries and produced. Course or granule sizes of the particles are almost the same size of natural sand in sandy beach. Therefore, the steel slag is expected to be used as an alternative material of marine sand for the creation of coastal ecosystems such as tidal flat and eelgrass bed. However, steelmaking slag has hydraulic property caused by the release of CaO and the solidification of steelmaking slag in sediment might have negative impacts on habitat for benthos and eelgrass. Therefore, the purposes of this study are to investigate solidification behavior of steelmaking slag in marine environment and monitor migrated aquatic organisms. In this study, dredged soil was mixed together with steelmaking slags ton alleviate significant pH increase and solidification. The drainage soil was mixed with decarbonized and dephosphorized slag at the ratio of 8 wet w/w% and submerged in sand filtrated seawater. The changes in Vane shear stress was monitored. The solidification were suppressed by adding the drainage soils.
