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Journal of Zhejiang University SCIENCE A 1998 Vol.-1 No.-1 P.

http://doi.org/10.1631/jzus.A2400020


Evolution of waterproof performance, mechanical properties, and microstructure in hydrophobically-modified geopolymer concrete during dry-wet cycles


Author(s):  Dongming YAN, Yilu QIU, Rongfeng GAO, Shikun CHEN, Yi LIU, Shengqian RUAN

Affiliation(s):  College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China; more

Corresponding email(s):   shengqian_ruan@zju.edu.cn

Key Words:  Geopolymer concrete, Hydrophobic modification, Waterproof performance, Mechanical property, Microstructure analysis


Dongming YAN, Yilu QIU, Rongfeng GAO, Shikun CHEN, Yi LIU, Shengqian RUAN. Evolution of waterproof performance, mechanical properties, and microstructure in hydrophobically-modified geopolymer concrete during dry-wet cycles[J]. Journal of Zhejiang University Science A, 1998, -1(-1): .

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%T Evolution of waterproof performance, mechanical properties, and microstructure in hydrophobically-modified geopolymer concrete during dry-wet cycles
%A Dongming YAN
%A Yilu QIU
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%A Shikun CHEN
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%I Zhejiang University Press & Springer
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A1 - Dongming YAN
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A1 - Rongfeng GAO
A1 - Shikun CHEN
A1 - Yi LIU
A1 - Shengqian RUAN
J0 - Journal of Zhejiang University Science A
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Y1 - 1998
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A2400020


Abstract: 
The waterproof performance, mechanical properties, chemical composition, microstructure, and pore structure of hydrophobically-modified geopolymer concrete are investigated before and after dry-wet cycles, to determine the long-term feasibility of using hydrophobically-modified geopolymer concrete in wet environments. We use two types of organic modifying agents: polydimethylsiloxane (PDMS) and sodium methyl siliconate (SMS). The experimental results show that incorporating 2%–6% PDMS or 5%–15% SMS can make the concrete hydrophobic, with water absorption and chloride transport rates decreasing by up to 94.3%. We also analyze the bonding modes of organic molecules and geopolymer gels, as well as their evolution mechanisms during dry-wet cycles. PDMS-modified geopolymer concrete is found to exhibit long-term waterproof performance that is not weakened by dry-wet cycles. This is attributed to the robust combination of organic components and the geopolymer gel skeleton formed through phase cross-linking. Meanwhile, PDMS-modified geopolymer concrete’s hydrophobicity, strength, and microstructure are essentially unaffected. In contrast, SMS-modified geopolymer concrete shows higher water sensitivity, although it does maintain efficient waterproof performance. Due to relatively low binding energy, the dry-wet cycles may lead to the detachment of some SMS molecules from the gel network, which results in a decrease of 18.6% in compressive strength and an increase of 37.6% in total porosity. This work confirms the utility of hydrophobically-modified geopolymer concrete as a building material for long-term service in wet environments, for instance areas with frequent precipitation, or splash and tidal zones.

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