Characterization of morphology and hydration products of high-volume fly ash paste by monochromatic scanning x-ray micro-diffraction (mu-SXRD)
- Authors
- Bae, Sung Chul; Meral, Cagla; Oh, Jae-eun; Moon, Juhyuk; Kunz, Martin; Monteiro, Paulo J. M.
- Issue Date
- May-2014
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- High-volume fly ash; Microstructure (B); C-S-H(I); Scanning transmission x-ray micro-diffraction; Stratlingite
- Citation
- CEMENT AND CONCRETE RESEARCH, v.59, pp.155 - 164
- Indexed
- SCIE
SCOPUS
- Journal Title
- CEMENT AND CONCRETE RESEARCH
- Volume
- 59
- Start Page
- 155
- End Page
- 164
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/159947
- DOI
- 10.1016/j.cemconres.2014.03.001
- ISSN
- 0008-8846
- Abstract
- The present study focuses on identification and micro-structural characterization of the hydration products formed in high-volume fly ash (HVFA)/portland cement (PC) systems using monochromatic scanning x-ray micro-diffraction (mu-SXRD) and SEM-EDS. Pastes with up to 80% fly ash replacement were studied. Phase maps for HVFA samples using mu-SXRD patterns prove that mu-SXRD is an effective method to identify and visualize the distribution of phases in the matrix. mu-SXRD and SEM-EDS analysis shows that the C-S-H formed in HVFA system containing 50% or more of fly ash has a similar structure as C-S-H(1) with comparatively lower Ca/Si ratio than the one produced in PC system. Moreover, coexistence of C-S-H(1) and stratlingite is observed in the system containing 80% of fly ash, confirming that the amount of alumina and silicate phases provided by the fly ash is a major factor for the formation of C-S-H(I) and stratlingite in HVFA system.
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