Abstract
In order to apply the iron and steelmaking slag to improvement of the seismic safety of the pile foundation, it is necessary to understand the physical and mechanical properties quantitatively. Hence the fundamental experiments including expansion test, permeability test and tri-axial compression test were carried out on the slag-specimens with several curing period. In application to the actual pile foundations, there is great concern that the swelling of the slag would affect on pile caps. Thus, the authors performed the slag swelling tests with new device designed for measuring expansion-stress of slag. This paper presents the test results and discussions about them.