期刊
CEMENT AND CONCRETE RESEARCH
卷 122, 期 -, 页码 179-188出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2019.04.019
关键词
Alkali-activation; Inorganic polymers; In-situ X-ray pair distribution function; Amorphous; Fe-silicate
资金
- Research Foundation - Flanders (FWO)
- National Science Foundation [1362039]
- U.S. DOE [DE-AC02-06CH11357]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1362039] Funding Source: National Science Foundation
The pursuit of low-CO2 technologies has led to a surge in research on alternative cementitious materials, of which alkali-activated materials are a large family. In recent years alkali-activated materials have expanded to encompass Fe-rich precursors in addition to the more commonly employed aluminosilicate precursors. The formation mechanism of alkali-activated materials from two Fe-rich synthetic slags has been assessed by employing in-situ X-ray total scattering and subsequent pair distribution function analysis. The evolution of the local atom-atom correlations reveals three reaction stages. After the dissolution of Fe-silicate clusters from the slag, a binder phase is formed with Fe in both Fe2+ and Fe3+ oxidation states. The Fe2+ state is present in the form of trioctahedral layers, similar to those in Fe(OH)(2), while the Fe3+ is likely located in the polymerized silicate network. Exposure to air causes the Fe2+ species to transition to the Fe3+ state.
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