Microwave curing of alkali-activated binder using hwangtoh without calcination

Baek Joong Kim, Chongku Yi, Kyung In Kang

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

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 ∼20 MPa can be developed within 4 h, versus 72 h with conventional heat. While the 29Si 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.

Original languageEnglish
Pages (from-to)465-475
Number of pages11
JournalConstruction and Building Materials
Volume98
DOIs
Publication statusPublished - 2015 Nov 15

Keywords

  • <sup>29</sup>Si solid-state NMR
  • Alkali activation
  • Hwangtoh
  • Microwave curing
  • Physical properties
  • XRD

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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