Abstract
Steelmaking slag is recently applied as coastal construction material, especially for coastal environmental improvement works. Steelmaking slag has higher CaO concentration so that alkalinity of surrounding seawater is important for appropriate utilization. In this study, influence of alkaline elution from steelmaking slag in ocean construction area was investigated, and alkaline elution simulation from steelmaking slag piled in seawater was calculated. Early stage after the construction, pH value tended to rise near the sea bottom, and its value is around to 0.05. This pH rising decreased gradually with time, and this gap was not observed one month later. Alkaline elution abilities of steelmaking slag recovered from sea bottom were confirmed that they became lower than initial slag's one. By using these alkaline elution properties, the pH value observed in this investigation was reasonably simulated by an analytical elution model from the slag piled.
