Effect of Synthesized Sol-Type Nano-SiO2 on the Mechanical Properties and Drying Shrinkage of Fly Ash–Slag-Based Geopolymer

Xu, Fu; Peng, Jincai; Si, Ruizhe; Li, Shuisheng; Yang, Dong; Luo, Zhengdong; Li, Xinyu; Wang, Wu

doi:10.1061/JMCEE7.MTENG-16819

Technical Papers

Feb 24, 2024

Effect of Synthesized Sol-Type Nano- ${SiO}_{2}$ on the Mechanical Properties and Drying Shrinkage of Fly Ash–Slag-Based Geopolymer

Authors: Fu Xu https://orcid.org/0000-0001-7658-4952 [email protected], Jincai Peng [email protected], Ruizhe Si https://orcid.org/0000-0002-0639-7374 [email protected], Shuisheng Li [email protected], Dong Yang [email protected], Zhengdong Luo [email protected], Xinyu Li [email protected], and Wu Wang [email protected]Author Affiliations

Publication: Journal of Materials in Civil Engineering

Volume 36, Issue 5

https://doi.org/10.1061/JMCEE7.MTENG-16819

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Abstract

In this study, nano-

{SiO}_{2}

was synthesized using the sol-gel method to modify the properties of fly ash-slag geopolymers (FASGs). FASGs with six contents of sol-type nano-

{SiO}_{2}

(0, 0.1%, 0.2%, 0.3%, 0.4%, and 0.5%) and two alkali dosages (5% and 7% of

{Na}_{2} O

) were prepared. The influences of sol-type nano-

{SiO}_{2}

and alkali content on the compressive strength, flexural strength, drying shrinkage, and microstructure of FASG were studied. The results demonstrated that the early-age compressive and flexure strength of FASG can be enhanced by sol-type nano-

{SiO}_{2}

due to the improved microstructure and the reaction products. The improvement effect of sol-type nano-

{SiO}_{2}

on mechanical properties was more significant for FASGs with lower alkali dosages. The optimized content of sol-type nano-

{SiO}_{2}

in FASG was 0.2% for the mechanical properties. The addition of the sol-type nano-

{SiO}_{2}

can mitigate the drying shrinkage of the FASG when the content is lower than 0.4%. The sol-type nano-

{SiO}_{2}

can promote the formation of reaction products in FASG and result in a denser microstructure of FASG.

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Data Availability Statement

Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.

Acknowledgments

The authors are sincerely grateful for the financial support of the Outstanding Young Projects of the Hunan Provincial Education Department (21B0123), the Hunan Provincial Natural Science Foundation of China (2022JJ30562), and the National Key Research and Development Program of China (2019YFC1904705). This study is partially supported by the Postdoctoral Research Foundation of China (2022M712639) and the Sichuan Science and Technology Program (2023NSFSC0897).

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Published In

Journal of Materials in Civil Engineering

Volume 36 • Issue 5 • May 2024

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Received: Apr 21, 2023

Accepted: Oct 27, 2023

Published online: Feb 24, 2024

Published in print: May 1, 2024

Discussion open until: Jul 24, 2024

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Fu Xu https://orcid.org/0000-0001-7658-4952 [email protected]

Professor, College of Civil Engineering, Xiangtan Univ., Xiangtan, Hunan 411105, PR China. ORCID: https://orcid.org/0000-0001-7658-4952. Email: [email protected]

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Jincai Peng [email protected]

Master’s Student, College of Civil Engineering, Xiangtan Univ., Xiangtan, Hunan 411105, PR China. Email: [email protected]

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Ruizhe Si https://orcid.org/0000-0002-0639-7374 [email protected]

Research Associate, Institute of Civil Engineering Materials, School of Civil Engineering, Southwest Jiaotong Univ., Chengdu, Sichuan 610031, PR China (corresponding author). ORCID: https://orcid.org/0000-0002-0639-7374. Email: [email protected]

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Shuisheng Li [email protected]

Senior Engineer, China Construction Fifth Engineering Division Corp., Ltd., No. 158 Zhongyi 1st Rd., Yuhua District, Changsha, Hunan 410011, PR China. Email: [email protected]

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Dong Yang [email protected]

Senior Engineer, China Construction Fifth Engineering Division Corp., Ltd., No. 158 Zhongyi 1st Rd., Yuhua District, Changsha, Hunan 410011, PR China. Email: [email protected]

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Zhengdong Luo [email protected]

Associate Professor, College of Civil Engineering, Xiangtan Univ., North 2nd Ring Rd., Yuhu District, Xiangtan, Hunan 411105, PR China. Email: [email protected]

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Xinyu Li [email protected]

Senior Engineer, Hunan Xihu Construction Group Co., Ltd., No. 676 Xianjiahu Rd., Yuelu District, Changsha 410013, China. Email: [email protected]

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Wu Wang [email protected]

Senior Engineer, Hunan Xihu Construction Group Co., Ltd., No. 676 Xianjiahu Rd., Yuelu District, Changsha 410013, China. Email: [email protected]

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