Development of alkali-activated binder using hwangtoh without calcination

Baek Joong Kim; Chongku Yi; Kyung In Kang

doi:10.1016/j.conbuildmat.2014.02.003

Development of alkali-activated binder using hwangtoh without calcination

Baek Joong Kim, Chongku Yi, Kyung In Kang

School of Civil, Environmental and Architectural Engineering

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

13 Citations (Scopus)

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 ²⁹Si solid-state NMR analysis, which showed that local environments of the ²⁹Si nucleus in hwangtoh transformed from Q³(0Al) to Q³(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 hwangtoh paste.

Original language	English
Pages (from-to)	206-213
Number of pages	8
Journal	Construction and Building Materials
Volume	58
DOIs	https://doi.org/10.1016/j.conbuildmat.2014.02.003
Publication status	Published - 2014 May 15

Bibliographical note

Funding Information:
“This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (2011-0004787). In addition, in part, this research was supported by a Korea University grant. Furthermore, this study made use of the KBSI NMR and SEM facility at Seoul, Korea.”

Keywords

Alkali activation
Hwangtoh
Physical properties
Si solid-state NMR
XRD

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
General Materials Science

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10.1016/j.conbuildmat.2014.02.003

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

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 29Si solid-state NMR analysis, which showed that local environments of the 29Si nucleus in hwangtoh transformed from Q3(0Al) to Q3(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 hwangtoh paste.",

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

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

note = "Funding Information: “This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (2011-0004787). In addition, in part, this research was supported by a Korea University grant. Furthermore, this study made use of the KBSI NMR and SEM facility at Seoul, Korea.” ",

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doi = "10.1016/j.conbuildmat.2014.02.003",

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AU - Kim, Baek Joong

AU - Yi, Chongku

AU - Kang, Kyung In

N1 - Funding Information: “This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (2011-0004787). In addition, in part, this research was supported by a Korea University grant. Furthermore, this study made use of the KBSI NMR and SEM facility at Seoul, Korea.”

PY - 2014/5/15

Y1 - 2014/5/15

N2 - 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 29Si solid-state NMR analysis, which showed that local environments of the 29Si nucleus in hwangtoh transformed from Q3(0Al) to Q3(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 hwangtoh paste.

AB - 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 29Si solid-state NMR analysis, which showed that local environments of the 29Si nucleus in hwangtoh transformed from Q3(0Al) to Q3(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 hwangtoh paste.

KW - Alkali activation

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KW - Si solid-state NMR

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Development of alkali-activated binder using hwangtoh without calcination

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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