Abstract
Steelmaking slag is one of the by-product in steel production. It is important to develop the method of reuse of it since the dawn of history. Recently, it is gaining interest as a material for pavement. Though slag pavement is inexpensive and has good workability, the understanding in the solidification mechanism is not enough. We here examined the relationship between the uniaxial compressive strength and the chemical property for the test pieces made of steelmaking slag and granulated blast furnace slag (GBFS). The uniaxial compressive strength, which increased linearly with aging, of the test pieces containing GBFS showed 3 or 4 times higher strength than that made of steelmaking slag alone. Binder materials, which solidified the void of slag pavement, were hydrated calcium silicate and calcium carbonate. Especially, the formation of calcium carbonate highly correlated with uniaxial compressive strength. The formation of calcium carbonate started at the top and bottom of the layer and gradually proceeded inwards with carbon dioxide supply from the atmosphere and soil air.
