The test embankment using granulated blast furnace slag (GBFS) was constructed in 2001, and its long-term characteristics were investigated. In this study, a sampling was conducted at the embankment after 16 years passed from construction, physical, chemical and mechanical properties were examined by field measurement and laboratory tests. Conclusions of this study are obtained as follows: 1) The dry density of the GBFS indicated about 1.2 g/cm3, and it was confirmed that the lightness of embankment was maintained. 2) The unconfined compressive strength shows more than 1 MPa by the hydraulic property of GBFS. 3) A high pH was observed directly under the embankment. But at other points, the pH showed near neutrality, and it is considered that there is no influence on the surrounding area.
