Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/176517
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- Title
- Microstructural and compositional change of NaOH-activated high calcium fly ash by incorporating Na-aluminate and co-existence of geopolymeric gel and C-S-H(I)
- Related
- Cement and concrete research, Vol. 42, No. 5, (2012), p.673-685
- DOI
- 10.1016/j.cemconres.2012.02.002
- Publisher
- Elsevier
- Date
- 2012
- Author/Creator
- Oh, Jae Eun
- Author/Creator
- Moon, Juhyuk
- Author/Creator
- Oh, Sang-Gyun
- Author/Creator
- Clark, Simon M
- Author/Creator
- Monteiro, Paulo J. M
- Description
- This study explores the reaction products of alkali-activated Class C fly ash-based aluminosilicate samples by means of high-resolution synchrotron X-ray diffraction (HSXRD), scanning electron microscope (SEM), and compressive strength tests to investigate how the readily available aluminum affects the reaction. Class C fly ash-based aluminosilicate raw materials were prepared by incorporating Na-aluminate into the original fly ashes, then alkali-activated by 10 M NaOH solution. Incorporating Na-aluminate reduced the compressive strength of samples, with the reduction magnitude relatively constant regardless of length of curing period. The HSXRD provides evidence of the co-existence of C–S–H with geopolymeric gels and strongly suggests that the C–S–H formed in the current system is C–S–H(I). The back-scattered electron images suggest that the C–S–H(I) phase exists as small grains in a finely intermixed form with geopolymeric gels. Despite providing extra source of aluminum, adding Na-aluminate to the mixes did not decrease the Si/Al ratio of the geopolymeric gel.
- Description
- 13 page(s)
- Subject Keyword
- Alkali activated cement (D)
- Subject Keyword
- C-S-H (B)
- Subject Keyword
- Fly ash (D)
- Subject Keyword
- Geopolymer
- Subject Keyword
- X-ray diffraction (B)
- Resource Type
- journal article
- Organisation
- Macquarie University. Dept. of Earth and Planetary Sciences
- Identifier
- http://hdl.handle.net/1959.14/176517
- Identifier
- ISSN:0008-8846
- Identifier
- mq_res-ext-2-s2.0-84858704834
- Language
- eng
- Reviewed
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