Title: Utilization of Electric Arc Furnace Slag for CO₂ Storage in Mortar using Pressurized CO₂ Curing Condition

Author(s): Indong Jang, Namkon Lee, Hoon Moon, Gijoon Park, Gumsung Ryu, Jungjun Park

Publication: Symposium Paper

Volume: 362

Issue:

Appears on pages(s): 444-452

Keywords: carbonation, pressurized CO₂ curing, steel slag

DOI: 10.14359/51740902

Date: 6/11/2024

Abstract:
Electric arc furnace slag is a byproduct generated in the steel industry, which can be categorized into oxidizing slag (electric arc furnace oxidizing slag, EOS) and reducing slag (electric arc furnace reducing slag, ERS) depending on the manufacturing process. These slags contain ions such as Ca, Si, and Mg in unstable states, allowing them to form minerals through reactions with CO₂. In this study, we investigated the carbonation efficiency of cement mortar incorporating these slags as supplementary mineral admixture and aggregates, under varying CO₂ curing conditions. CO₂ curing was conducted under a 99% concentration CO₂ at a pressure of 10 bar. The curing temperatures were adjusted to 20℃ [68°F], 60℃ [140°F], and 90℃ [194°F], and compressive strength and carbonation depth were measured according to the slag substitution rate. Cement mortar with slag shows higher in both compressive strength and carbonation depth.