Grinding Characteristics and Cementitious Properties of Steel Slag
The grinding characteristics and cementitious properties of steel slag (SS) were investigated by particle size analysis, specific surface area analysis, field emission electron microscope (FE-SEM), X-ray diffraction, strength test and non-evaporable water content determination. The results show that SS have a slightly better grindabilities than ground granulated blast furnace slag (GGBFS). The specific surface area of SS powder is 690 m2·kg-1 by milling for 100 min. The milled SS product obtained by milling for 100 min contains 81% grain particles smaller than 5 μm which can fill space between cement particles among them, much smaller particles with submicron or nanometer size were also observed. The hydration products of SS are C-S-H gel and Ca(OH)2. The C–S–H gel produced by SS dose not adhere mutually well, and show a low bonding behavior, thus resulting in a rather low strength of steel slag mortar.