caa a22 4500 606199888 CHVBK 20210128100941.0 cr unu---uuuuu 210128e20151201xx s 000 0 eng 10.1007/s10653-015-9750-8 doi (NATIONALLICENCE)springer-10.1007/s10653-015-9750-8 Development of an MgO-based binder for stabilizing fine sediments and storing CO2 [Elektronische Daten] [Kyung-Yup Hwang, Jun-Young Ahn, Cheolyong Kim, Jeong-Yun Seo, Inseong Hwang] An MgO-based binder was developed that could stabilize fine dredged sediments for reuse and store CO2. Initially, a binder consisting of fly ash (FA) and blast furnace slag (BFS) was developed by using alkaline activators such as KOH, NaOH, and lime. The FA0.4-BFS0.6 binder (mixed at a FA-to-BFS weight ratio of 4:6) showed the highest compressive strength of 10.7MPa among FA/BFS binders when 5M KOH was used. When lime (L) was tested as an alkaline activator, the strength was comparable with those obtained when KOH or NaOH was used. The L0.1-(FA0.4BFS0.6)0.9 binder (10% lime mixed with the FA/BFS binder) showed the highest strength of 11.0MPa. Finally, by amending this L0.1-(FA0.4BFS0.6)0.9 binder with MgO, a novel MgO-based binder (MgO0.5-(L0.1-(FA0.4BFS0.6)0.9) 0.5) was developed, which demonstrated the 28th day strength of 11.9MPa. The MgO-based binder was successfully applied to stabilize a fine sediment to yield a compressive strength of 4.78MPa in 365days, which was higher than that obtained by the Portland cement (PC) system (3.22MPa). Carbon dioxide sequestration was evidenced by three observations: (1) the decrease in pH of the treated sediment from 12.2 to 11.0; (2) the progress of the carbonation front inward the treated sediment; and (3) the presence of magnesium carbonates. The thermogravimetric analysis (TGA) results showed that 67.2kg of CO2 per ton of the treated sediment could be stored under the atmospheric condition during 1year. Springer Science+Business Media Dordrecht, 2015 Magnesium oxide nationallicence Carbon dioxide storage nationallicence Solidification/stabilization nationallicence Dredged sediment nationallicence Compressive strength nationallicence Hwang Kyung-Yup School of Civil and Environmental Engineering, Pusan National University, 30 Jangjeon-Dong, Geumjeong-Gu, 609-735, Busan, Korea aut Ahn Jun-Young School of Civil and Environmental Engineering, Pusan National University, 30 Jangjeon-Dong, Geumjeong-Gu, 609-735, Busan, Korea aut Kim Cheolyong School of Civil and Environmental Engineering, Pusan National University, 30 Jangjeon-Dong, Geumjeong-Gu, 609-735, Busan, Korea aut Seo Jeong-Yun School of Civil and Environmental Engineering, Pusan National University, 30 Jangjeon-Dong, Geumjeong-Gu, 609-735, Busan, Korea aut Hwang Inseong School of Civil and Environmental Engineering, Pusan National University, 30 Jangjeon-Dong, Geumjeong-Gu, 609-735, Busan, Korea aut Environmental Geochemistry and Health Springer Netherlands 37/6(2015-12-01), 1063-1072 0269-4042 37:6<1063 2015 37 10653 https://doi.org/10.1007/s10653-015-9750-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10653-015-9750-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hwang Kyung-Yup School of Civil and Environmental Engineering, Pusan National University, 30 Jangjeon-Dong, Geumjeong-Gu, 609-735, Busan, Korea aut NATIONALLICENCE 700 1- Ahn Jun-Young School of Civil and Environmental Engineering, Pusan National University, 30 Jangjeon-Dong, Geumjeong-Gu, 609-735, Busan, Korea aut NATIONALLICENCE 700 1- Kim Cheolyong School of Civil and Environmental Engineering, Pusan National University, 30 Jangjeon-Dong, Geumjeong-Gu, 609-735, Busan, Korea aut NATIONALLICENCE 700 1- Seo Jeong-Yun School of Civil and Environmental Engineering, Pusan National University, 30 Jangjeon-Dong, Geumjeong-Gu, 609-735, Busan, Korea aut NATIONALLICENCE 700 1- Hwang Inseong School of Civil and Environmental Engineering, Pusan National University, 30 Jangjeon-Dong, Geumjeong-Gu, 609-735, Busan, Korea aut NATIONALLICENCE 773 0- Environmental Geochemistry and Health Springer Netherlands 37/6(2015-12-01), 1063-1072 0269-4042 37:6<1063 2015 37 10653