Carbon Dioxide Fixation Properties and Mechanism of Steel Slag in the Use for Formation of Low-carbon Society

Abstract

This paper presents the CO₂ fixation properties of steel slag containing calcium, and proposes a geotechnical application for the formation of a sound material-cycle society and a low-carbon society. In order to investigate the properties of CO₂ fixation, CO₂ fixation test with vented constant flow was conducted. As a result, when the CO₂ concentration 4500μL_-CO2/L was vented in a specimen by 0.05 L/min, non-aging steelmaking slag amount of CO₂ fixed is the maximum, the value was 0.04 g_-CO2/g-slag. The amount of CO₂ that is fixed in the steelmaking slag was about 20% of water-soluble calcium. Therefore, a possibility that the quantity of CO₂ fixation could be evaluated was shown from the viewpoint of the mechanism of CO₂ fixation using the quantity of water-soluble calcium.