Fatigue strength of steel-making slag concrete (SSC) under compression in submerged condition was experimentally investigated on the assumption that SSC will be applied to marine or harbor structures. The fatigue strength of SSC under compression in submerged condition was found to be slightly smaller than that of ordinary cement concrete (OCC). An investigation focusing on the deformation characteristics of specimens revealed that the incremental strain per cycle under the same stress ratio on SSC is larger than that on OCC, possibly leading to shorter fatigue life for SSC. For the purpose of improving the fatigue strength of SSC, hot-metal pretreatment slag was grinded in the Los Angeles machine to produce fine and coarse aggregate for SSC, and the aggregate thus obtained was used. The resulting finding was that use of grinded hot-metal pretreatment slag enhances the durability against fatigue of SSC in compression under submerged condition.
