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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국콘크리트학회 International Journal of Concrete Structures and Materials International Journal of Concrete Structures and Materials Vol.12 No.5
- 발행연도
- 2018.7
- 수록면
- 615 - 627 (13page)
이용수
초록· 키워드
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The dissolution and release of active ions, such as Si<SUP>4+</SUP>, Al<SUP>3+</SUP> and Ca<SUP>2+</SUP>, from fly ash directly affect the rate and extent of reaction product formation, which in turn affect the physical and mechanical properties of fly ash filling materials. In this study, low-calcium fly ash was soaked and activated in NaOH solutions with different concentrations (approximating the optimum dose range) for different lengths of time. The amounts of active ions leached and the changes in the mineral composition, chemical functional groups and surface morphology were tested and analyzed via ICP-OES, XRD, FTIR and SEM/EDS techniques. Based on these analyses, the reaction mechanism of alkali activation of low-calcium fly ash was further investigated. The results showed that the NaOH activation effect can significantly increase the amount of active ions leached from low-calcium fly ash. Notably, the amount of Si<SUP>4+</SUP> and Al<SUP>3+</SUP> leached clearly increased with increases in both NaOH concentration and soaking time. The plausible reaction mechanism is discussed in detail, which is that the alkali activator principally affected the surface of the vitreous particles of lowcalcium fly ash and induced differing surface modifications in the dissolution stage, depolymerization stage, polycondensation and polymer gel stage and diffusion stage. It was observed that the progress of the reaction is controlled by dissolution in the early stages, whereas activation is governed by diffusion when the surfaces of the fly ash particles are covered by precipitates.
목차
Abstract
1. Introduction
2. Experimental Procedures
3. Results and Analysis
4. Reaction Mechanism During Alkali Activation of Low‑Calcium Fly Ash
5. Conclusions
References
참고문헌 (47)
참고문헌 신청
Bijen, J., & Waltje, H. (1989). Alkali-activated slag?fly ash cements. InFly ash,silica fume, slag and natural Pozzolans in concrete. Proceedings of the thirdinternational conference.
Blissett, R. S., & Rowson, N. A. (2012). A review of the multi-component utilisationof coal fly ash. Fuel, 97, 1?23.
Brueggen, B., Kang, T. H. K., & Ramseyer, C. (2010). Experimental and SEManalyses of ground fly ash in concrete. International Journal of ConcreteStructures & Materials, 4, 51?54.
Cicek, T., & Cincin, Y. (2015). Use of fly ash in production of light-weight buildingbricks. Construction and Building Materials, 94, 521?527.
Fernandez-Jimenez, A., Garcia-Lodeiro, I., & Palomo, A. (2007). Durability ofalkali-activated fly ash cementitious materials. Journal of Materials Science,42, 3055?3065.
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