Inhibiting efflorescence formation on fly ash–based geopolymer via silane surface modification

Xiao Xue; Yun-Lin Liu; Jian-Guo Dai; Chi-Sun Poon; Wei-Dong Zhang; Peng Zhang

doi:10.1016/j.cemconcomp.2018.08.013

Inhibiting efflorescence formation on fly ash–based geopolymer via silane surface modification

Xiao Xue, Yun-Lin Liu, Jian-Guo Dai^*, Chi-Sun Poon, Wei-Dong Zhang, Peng Zhang

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

193 Citations (Scopus)

Abstract

Efflorescence can be a critical issue for the application of alkali-activated fly ash–based geopolymer products, especially when the products are in a moist environment. In this study, a new method was explored to inhibit efflorescence of fly ash–based geopolymer via silane surface modifications. After the modification, the surface of the geopolymer was transformed from hydrophilic to hydrophobic, with a water contact angle of 144.1° and the capillary absorption and diffusion of water were significantly suppressed; and as a consequence, the soluble alkali ion leaching was reduced. Analysis by Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and size-exclusion chromatography demonstrated that the selected silane is attached successfully onto the surface of the fly ash–based geopolymer via chemical bonding instead of via physical absorption. A possible reaction mechanism for the silane surface modification of the fly ash–based geopolymer is proposed. © 2018 Elsevier Ltd

Original language	English
Pages (from-to)	43-52
Journal	Cement and Concrete Composites
Volume	94
Online published	23 Aug 2018
DOIs	https://doi.org/10.1016/j.cemconcomp.2018.08.013
Publication status	Published - Nov 2018
Externally published	Yes

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Funding

The authors acknowledge the financial support received from the Research Grants Council of the Hong Kong SAR (Project No. PolyU 5145/13E ), the National Science Foundation of China Project No. 51638008 , and the Hong Kong Polytechnic University through a Post-Doctoral Fellowship (Project code: G-YW2F ). Dr. X. Xue and Dr. Liu contributed equally to this work.

Research Keywords

Alkali-activation
Effloresce
Fly ash
Geopolymer
Silane
Surface modification

RGC Funding Information

RGC-funded

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10.1016/j.cemconcomp.2018.08.013

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abstract = "Efflorescence can be a critical issue for the application of alkali-activated fly ash–based geopolymer products, especially when the products are in a moist environment. In this study, a new method was explored to inhibit efflorescence of fly ash–based geopolymer via silane surface modifications. After the modification, the surface of the geopolymer was transformed from hydrophilic to hydrophobic, with a water contact angle of 144.1° and the capillary absorption and diffusion of water were significantly suppressed; and as a consequence, the soluble alkali ion leaching was reduced. Analysis by Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and size-exclusion chromatography demonstrated that the selected silane is attached successfully onto the surface of the fly ash–based geopolymer via chemical bonding instead of via physical absorption. A possible reaction mechanism for the silane surface modification of the fly ash–based geopolymer is proposed. {\textcopyright} 2018 Elsevier Ltd",

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note = "Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].",

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T1 - Inhibiting efflorescence formation on fly ash–based geopolymer via silane surface modification

AU - Xue, Xiao

AU - Liu, Yun-Lin

AU - Dai, Jian-Guo

AU - Poon, Chi-Sun

AU - Zhang, Wei-Dong

AU - Zhang, Peng

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2018/11

Y1 - 2018/11

N2 - Efflorescence can be a critical issue for the application of alkali-activated fly ash–based geopolymer products, especially when the products are in a moist environment. In this study, a new method was explored to inhibit efflorescence of fly ash–based geopolymer via silane surface modifications. After the modification, the surface of the geopolymer was transformed from hydrophilic to hydrophobic, with a water contact angle of 144.1° and the capillary absorption and diffusion of water were significantly suppressed; and as a consequence, the soluble alkali ion leaching was reduced. Analysis by Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and size-exclusion chromatography demonstrated that the selected silane is attached successfully onto the surface of the fly ash–based geopolymer via chemical bonding instead of via physical absorption. A possible reaction mechanism for the silane surface modification of the fly ash–based geopolymer is proposed. © 2018 Elsevier Ltd

AB - Efflorescence can be a critical issue for the application of alkali-activated fly ash–based geopolymer products, especially when the products are in a moist environment. In this study, a new method was explored to inhibit efflorescence of fly ash–based geopolymer via silane surface modifications. After the modification, the surface of the geopolymer was transformed from hydrophilic to hydrophobic, with a water contact angle of 144.1° and the capillary absorption and diffusion of water were significantly suppressed; and as a consequence, the soluble alkali ion leaching was reduced. Analysis by Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and size-exclusion chromatography demonstrated that the selected silane is attached successfully onto the surface of the fly ash–based geopolymer via chemical bonding instead of via physical absorption. A possible reaction mechanism for the silane surface modification of the fly ash–based geopolymer is proposed. © 2018 Elsevier Ltd

KW - Alkali-activation

KW - Effloresce

KW - Fly ash

KW - Geopolymer

KW - Silane

KW - Surface modification

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DO - 10.1016/j.cemconcomp.2018.08.013

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SN - 0958-9465

VL - 94

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JO - Cement and Concrete Composites

JF - Cement and Concrete Composites

ER -

Inhibiting efflorescence formation on fly ash–based geopolymer via silane surface modification

Abstract

Bibliographical note

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Research Keywords

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