Phosphate-based geopolymer: Formation mechanism and thermal stability

Yan-Shuai Wang; Jian-Guo Dai; Zhu Ding; Wei-Ting Xu

doi:10.1016/j.matlet.2017.01.022

Phosphate-based geopolymer: Formation mechanism and thermal stability

Yan-Shuai Wang
, Jian-Guo Dai^*
, Zhu Ding
, Wei-Ting Xu

^*Corresponding author for this work

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

138 Citations (Scopus)

Abstract

Chemosynthetic phosphate-based geopolymer is a new type of low carbon and eco-friendly construction material. This article aims to investigate the formation mechanism and thermal stability of this new type of geopolymer. In this study, three mixes of the phosphate-based geopolymer were designed and synthesized at ambient temperature with different molar ratios of Si, Al and P, which were supplied by the raw materials of silica fume, metakaolin and monoaluminum phosphate. No accelerating setting condition (e.g., metal oxides addition or high temperature curing) was applied. The experimental results showed that the 28-day compressive strength of the hardened geopolymer paste arrived at about 31 MPa when the Al/P molar ratio is equal to 1.0, which was ensured by the formation of an amorphous structure of SiO₂·Al₂O₃·P₂O₅·nH₂O and a crystalline phase, aluminum hydrogen phosphate (AlH₃(PO₄)₂·3H₂O). At elevated temperatures, a phase transition of the phosphate-based geopolymer was activated from aluminum hydrogen phosphate to berlinite (AlPO₄) and the silicon-containing phase was rearranged. © 2017 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	209-212
Journal	Materials Letters
Volume	190
Online published	6 Jan 2017
DOIs	https://doi.org/10.1016/j.matlet.2017.01.022
Publication status	Published - 1 Mar 2017
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 would like to acknowledge the financial support received from the Research Grants Council of the Hong Kong SAR (Project No. PolyU 5145/13E), The Hong Kong Polytechnic University through PhD studentship and National Natural Science Foundation of China (Project No. 51472163).

Research Keywords

Formation mechanism
Geopolymer
Phase transition
Phosphate
Thermal stability

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title = "Phosphate-based geopolymer: Formation mechanism and thermal stability",

abstract = "Chemosynthetic phosphate-based geopolymer is a new type of low carbon and eco-friendly construction material. This article aims to investigate the formation mechanism and thermal stability of this new type of geopolymer. In this study, three mixes of the phosphate-based geopolymer were designed and synthesized at ambient temperature with different molar ratios of Si, Al and P, which were supplied by the raw materials of silica fume, metakaolin and monoaluminum phosphate. No accelerating setting condition (e.g., metal oxides addition or high temperature curing) was applied. The experimental results showed that the 28-day compressive strength of the hardened geopolymer paste arrived at about 31 MPa when the Al/P molar ratio is equal to 1.0, which was ensured by the formation of an amorphous structure of SiO2·Al2O3·P2O5·nH2O and a crystalline phase, aluminum hydrogen phosphate (AlH3(PO4)2·3H2O). At elevated temperatures, a phase transition of the phosphate-based geopolymer was activated from aluminum hydrogen phosphate to berlinite (AlPO4) and the silicon-containing phase was rearranged. {\textcopyright} 2017 Elsevier B.V. All rights reserved.",

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author = "Yan-Shuai Wang and Jian-Guo Dai and Zhu Ding and Wei-Ting Xu",

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AU - Wang, Yan-Shuai

AU - Dai, Jian-Guo

AU - Ding, Zhu

AU - Xu, Wei-Ting

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].

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N2 - Chemosynthetic phosphate-based geopolymer is a new type of low carbon and eco-friendly construction material. This article aims to investigate the formation mechanism and thermal stability of this new type of geopolymer. In this study, three mixes of the phosphate-based geopolymer were designed and synthesized at ambient temperature with different molar ratios of Si, Al and P, which were supplied by the raw materials of silica fume, metakaolin and monoaluminum phosphate. No accelerating setting condition (e.g., metal oxides addition or high temperature curing) was applied. The experimental results showed that the 28-day compressive strength of the hardened geopolymer paste arrived at about 31 MPa when the Al/P molar ratio is equal to 1.0, which was ensured by the formation of an amorphous structure of SiO2·Al2O3·P2O5·nH2O and a crystalline phase, aluminum hydrogen phosphate (AlH3(PO4)2·3H2O). At elevated temperatures, a phase transition of the phosphate-based geopolymer was activated from aluminum hydrogen phosphate to berlinite (AlPO4) and the silicon-containing phase was rearranged. © 2017 Elsevier B.V. All rights reserved.

AB - Chemosynthetic phosphate-based geopolymer is a new type of low carbon and eco-friendly construction material. This article aims to investigate the formation mechanism and thermal stability of this new type of geopolymer. In this study, three mixes of the phosphate-based geopolymer were designed and synthesized at ambient temperature with different molar ratios of Si, Al and P, which were supplied by the raw materials of silica fume, metakaolin and monoaluminum phosphate. No accelerating setting condition (e.g., metal oxides addition or high temperature curing) was applied. The experimental results showed that the 28-day compressive strength of the hardened geopolymer paste arrived at about 31 MPa when the Al/P molar ratio is equal to 1.0, which was ensured by the formation of an amorphous structure of SiO2·Al2O3·P2O5·nH2O and a crystalline phase, aluminum hydrogen phosphate (AlH3(PO4)2·3H2O). At elevated temperatures, a phase transition of the phosphate-based geopolymer was activated from aluminum hydrogen phosphate to berlinite (AlPO4) and the silicon-containing phase was rearranged. © 2017 Elsevier B.V. All rights reserved.

KW - Formation mechanism

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KW - Thermal stability

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Phosphate-based geopolymer: Formation mechanism and thermal stability

Abstract

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Research Keywords

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