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| Effect of PDMS incorporation on property and microstructure of geopolymer |
Sheng-qian RUAN1( ),Tie-long WANG2,*(),Shi-kun CHEN1,Yi LIU3,Dong-ming YAN1 |
1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
2. Beijing Special Engineering Design and Research Institute, Beijing 100000, China
3. School of Materials Science and Engineering, Zhejiang University, Hangzhou 310058, China |
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Abstract Composite materials with different proportions were fabricated in order to characterize the modification effect of polydimethylsiloxane (PDMS) in metakaolin-based geopolymers and improve their waterproof and corrosion resistance. Contact angle measurement, thermogravimetric and strength tests were performed to characterize the wettability, water retention and mechanical strength of the material. Mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM), backscattering (BSE), and energy dispersive (EDS) tests were performed to analyze the pore distribution, microstructure, and chemical composition. Results show that PDMS can hydrophobically modify the geopolymer gel extensively and uniformly, and the contact angle is about 130° when the mass ratio of PDMS to MK (mPDMS/mMK) is 0.025. Adding the silane coupling agent and drying treatment can improve hydrophobicity. A proper mass ratio of PDMS (0.01≤mPDMS/mMK≤0.025) can improve the strength and toughness of the geopolymer, because the gel structure of the composite is denser. PDMS enhances the binding force of geopolymers to moisture at low temperature, which is significant for reducing drying shrinkage.
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Received: 21 July 2021
Published: 26 July 2022
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| Fund: 国家自然科学基金资助项目（51978608，51879230） |
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Corresponding Authors:
Tie-long WANG
E-mail: shengqian_ruan@zju.edu.cn;wang-tielong@163.com
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内掺PDMS对地聚合物性能和微观结构的影响
为了表征内掺聚二甲基硅氧烷（PDMS）对偏高岭土基地聚合物的改性效果，提高防水和耐腐性能，制备不同配比的复合材料. 采用接触角、热重和强度试验，表征材料的润湿性、保水性和力学性能. 采用压汞法（MIP）、扫描电镜（SEM）、背散射（BSE）和能谱测试（EDS），分析孔隙分布、微观结构和化学组成. 结果表明，PDMS能够对地聚合物凝胶进行广泛且均匀的疏水化改性，当PDMS与MK的质量比（mPDMS/mMK）为0.025时，接触角约为130°. 添加硅烷偶联剂和干燥处理，均能够提高疏水性. 适当质量比的PDMS（0.01≤mPDMS/mMK≤0.025）能够提高地聚合物的强度和韧性，因为复合材料的凝胶结构更致密. PDMS增强了低温状态下地聚合物对水分的束缚力，对减小干缩具有重要意义.
关键词：
地聚合物,
聚二甲基硅氧烷,
疏水改性,
润湿性,
力学性能
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