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Microwave curing of alkali-activated binder using hwangtoh without calcination
- Authors
- Kim, Baek-Joong; Yi, Chongku; Kang, Kyung-In
- Issue Date
- 15-11월-2015
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Hwangtoh; Alkali activation; Microwave curing; Physical properties; XRD; Si-29 solid-state NMR
- Citation
- CONSTRUCTION AND BUILDING MATERIALS, v.98, pp.465 - 475
- Indexed
- SCIE
SCOPUS
- Journal Title
- CONSTRUCTION AND BUILDING MATERIALS
- Volume
- 98
- Start Page
- 465
- End Page
- 475
- ISSN
- 0950-0618
- Abstract
- Microwaves were used to accelerate the curing of alkali activated hwangtoh paste (AAHP); the resulting compressive strength, porosity and composition were then compared against conventional heat-cured specimens. This found that a compressive strength of similar to 20 MPa can be developed within 4 h, versus 72 h with conventional heat. While the Si-29 NMR analysis showed the similar trends in the chemical shift with the curing time, the MIP results showed that the microwave-cured AAHP contained a greater cumulative pore volume and mean pore size than the conventional thermal-cured AAHP of the equal strength. The compressive strength of microwave-cued AAHP was attributed to the formation of a well-crystallized hydroxysodalite phase and an internal temperature gradient generated during curing. (C) 2015 Elsevier Ltd. All rights reserved.
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