Microwave curing of alkali-activated binder using hwangtoh without calcination

Baek Joong Kim; Chongku Yi; Kyung In Kang

doi:10.1016/j.conbuildmat.2015.08.119

Microwave curing of alkali-activated binder using hwangtoh without calcination

Baek Joong Kim
, Chongku Yi^*
, Kyung In Kang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

38 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 language	English
Pages (from-to)	465-475
Number of pages	11
Journal	Construction and Building Materials
Volume	98
DOIs	https://doi.org/10.1016/j.conbuildmat.2015.08.119
Publication status	Published - 2015 Nov 15

Bibliographical note

Publisher Copyright:
© 2015 Elsevier Ltd. All rights reserved.

Keywords

29Si solid-state NMR
Alkali activation
Hwangtoh
Microwave curing
Physical properties
XRD

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
General Materials Science

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10.1016/j.conbuildmat.2015.08.119

Cite this

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title = "Microwave curing of alkali-activated binder using hwangtoh without calcination",

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.",

keywords = "29Si solid-state NMR, Alkali activation, Hwangtoh, Microwave curing, Physical properties, XRD",

author = "Kim, \{Baek Joong\} and Chongku Yi and Kang, \{Kyung In\}",

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doi = "10.1016/j.conbuildmat.2015.08.119",

language = "English",

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pages = "465--475",

journal = "Construction and Building Materials",

issn = "0950-0618",

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TY - JOUR

T1 - Microwave curing of alkali-activated binder using hwangtoh without calcination

AU - Kim, Baek Joong

AU - Yi, Chongku

AU - Kang, Kyung In

PY - 2015/11/15

Y1 - 2015/11/15

N2 - 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.

AB - 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.

KW - 29Si solid-state NMR

KW - Alkali activation

KW - Hwangtoh

KW - Microwave curing

KW - Physical properties

KW - XRD

UR - https://www.scopus.com/pages/publications/84940373111

U2 - 10.1016/j.conbuildmat.2015.08.119

DO - 10.1016/j.conbuildmat.2015.08.119

M3 - Article

AN - SCOPUS:84940373111

SN - 0950-0618

VL - 98

SP - 465

EP - 475

JO - Construction and Building Materials

JF - Construction and Building Materials

ER -

Microwave curing of alkali-activated binder using hwangtoh without calcination

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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