Thermodynamic Modeling and Experimental Study of Carbonation of Alkali-Activated Slag Cements

被引：18

作者：

Park, Solmoi ^{[1
,5
,6
]}

Lothenbach, Barbara ^{[1
,2
]}

Jang, Jeong Gook ^{[7
]}

Kim, Hyeong-Ki ^{[3
]}

Lee, Namkon ^{[4
]}

机构：

[1] Swiss Fed Labs Mat Sci & Technol Empa, Concrete & Asphalt Lab, CH-8600 Dubendorf, Switzerland

[2] Norwegian Univ Sci & Technol NTNU, Dept Struct Engn, N-7491 Trondheim, Norway

[3] Chosun Univ, Dept Architectural Engn, Gwangju 61452, South Korea

[4] Korea Inst Civil Engn & Bldg Technol, Struct Engn Res Div, Goyang 10223, South Korea

[5] Pukyong Natl Univ, Dept Civil Engn, Pusan 48513, South Korea

[6] Korea Adv Inst Sci & Technol KAIST, Dept Civil & Environm Engn, Daejeon 34141, South Korea

[7] Incheon Natl Univ, Urban Sci Inst, Div Architecture & Urban Design, Incheon 22012, South Korea

来源：

ACS SUSTAINABLE CHEMISTRY & ENGINEERING | 2023年 / 11卷 / 10期

基金：

新加坡国家研究基金会;

关键词：

alkali-activated cement; granulated blast-furnace slag; carbonation; thermodynamic modeling; HYDRATED PORTLAND CEMENTS; C-S-H; PORE SOLUTION; AL-27; MAS; NMR; SI-29; ALUMINUM; PHASE; EVOLUTION; PRODUCTS;

D O I：

10.1021/acssuschemeng.2c05789

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The present study investigates the carbonation of slags activated by NaOH, Na2SiO3, Na2CO3, and Na2SO4. The main hydrates in those activated with NaOH or Na2SiO3 were C (N-)A-S-H, stra''tlingite, and MgAl-layered double hydroxide phases as observed using different experimental characterization techniques and thermodynamic modeling. The use of a Na2CO3 activator led to the formation of calcium carbonate and monocarbonate instead of stra''tlingite, and Na2SO4 to ettringite formation. Carbonation of the alkali-activated slags in a powdered form at 1 vol % concentration of the CO2 environment proceeded rapidly, while little change was observed after 7 d. The main carbonation products commonly identified were calcium carbonate, carbonate containing-MgAl-layered double hydroxide, and N-A-S-H. In Na2SiO3- and Na2SO4-activated slags, M-S-H formation was predicted, which destabilized the MgAl-layered double hydroxide phases. Stra''tlingite and monocarbonate, which were initially present or formed as a transient phase, were transformed to N-A-S-H during carbonation, while C-(N-)A-S-H was only partially decalcified and destabilized.

引用

页码：4049 / 4063

页数：15

共 66 条

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