title: Effect of extraction solutions on carbonation of cementitious materials in aqueous solutions.
abstract: Carbonation efficiency was evaluated for three cementitious materials having different CaO-bearing minerals (lime, Portland cement and waste concrete) using various extraction reagents (HCl, CH3COOH, NH4Cl and deionized water). The cementitious materials were subjected to Ca extraction and carbonation tests under ambient pressure and temperature conditions. The Ca extraction efficiency generally decreased in the order lime, Portland cement and waste concrete, regardless of the extraction solution. Among the extraction solutions, NH4Cl was the most effective for Ca extraction and carbonation. The results of this study suggest that the types of extraction solution and CaO-bearing mineral of the materials are primary factors affecting carbonation efficiency.
authors.affiliation: Department of Earth and Environmental Sciences, Korea University, Seoul, Republic of Korea.
authors.forename: Hwanju
authors.initials: H
authors.lastname: Jo
authors.forename: Ho Young
authors.initials: HY
authors.lastname: Jo
authors.forename: Young-Nam
authors.initials: YN
authors.lastname: Jang
mesh_terms: D002118:Calcium / Q000302:isolation & purification*; D017610:Calcium Compounds / Q000737:chemistry*; D002245:Carbon Dioxide / Q000302:isolation & purification*; D011232:Chemical Precipitation; D003252:Construction Materials; D004553:Electric Conductivity; D006863:Hydrogen-Ion Concentration; D010087:Oxides / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D010087:Oxides; D002245:Carbon Dioxide; C016538:lime; D002118:Calcium