Development of alkali-activated binder using hwangtoh without calcination
- Authors
- Kim, Baek-Joong; Yi, Chongku; Kang, Kyung-In
- Issue Date
- 15-5월-2014
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Hwangtoh; Alkali activation; Physical properties; XRD; Si-29 solid-state NMR
- Citation
- CONSTRUCTION AND BUILDING MATERIALS, v.58, pp.206 - 213
- Indexed
- SCIE
SCOPUS
- Journal Title
- CONSTRUCTION AND BUILDING MATERIALS
- Volume
- 58
- Start Page
- 206
- End Page
- 213
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/98508
- DOI
- 10.1016/j.conbuildmat.2014.02.003
- ISSN
- 0950-0618
- Abstract
- In terms of flow and compressive strength, we examined natural hwangtoh, a readily available eco-friendly material mineralogically similar to kaolin, as a possible alkali-activated binding material. The phase and molecular structures of hwangtoh before and after alkali activation were analyzed by X-ray diffraction (XRD) and solid-state nuclear magnetic resonance (NMR). The sample prepared by mixing hwangtoh with 10 M sodium hydroxide and sodium silicate solutions at 0.45 and 0.10 by weight of hwangtoh, respectively, gave the highest compressive strength of 25.4 MPa and a flow value of 50%. The results of the XRD analysis were consistent with the results of Si-29 solid-state NMR analysis, which showed that local environments of the Si-29 nucleus in hwangtoh transformed from Q(3)(0Al) to Q(3)(1Al) and Q(4) in the amorphous phase during the alkali-activation process. The newly formed reaction products filled the pores and densified the matrix, improving the compressive strength of the alkali-activated
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Engineering > School of Civil, Environmental and Architectural Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.