Fly ash-based geopolymer grouting material modified by metakaolin for greener road engineering

IF 1.5 4区 工程技术 Q3 ENGINEERING, CIVIL Proceedings of the Institution of Civil Engineers-Engineering Sustainability Pub Date : 2023-04-04 DOI:10.1680/jensu.22.00079
Feng Li, Zhanning Yang, Siqi Zhou, Xiao Zhang, Duanyang Liu, Yijie Su, Q. Niu
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Abstract

Fly ash usually requires high-temperature maintenance owning to low volcanic ash activity, which greatly limits its application. In this study, fly ash-based geopolymer grouting materials were prepared by modifying them with suitable alkali activators and metakaolin under room temperature. The results of the orthogonal experiments showed that the content of metakaolin had the most significant effect on the material’s 1, 7, and 28 d mechanical properties. The optimum mix proportion was determined as metakaolin content (mMK/mP)=15%, sodium silicate modulus (Ms)=1.0, sodium silicate content (mSS/mP)=50%. The compressive strengths of the materials at 1, 7 and 28 days were 12.6, 24.9 and 36.3 MPa, respectively. The results of X-ray diffraction, Fourier transform infrared spectroscopy, mercury intrusion porosimetry, and scanning electron microscopy showed that the reaction mechanism of fly ash was subjected to a bi-directional alkaline attack. Meanwhile, the unreacted fly ash particles proved the inertness of fly ash. While metakaolin mostly dissolved and formed N-A-S-H gel to increase the mechanical strength of geopolymer. The material developed in this study can meet the specification requirements of inorganic cementitious material for road grouting in terms of compressive strength and fluidity, extending the usage amount of fly ash and contributing to environmental protection.
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偏高岭土改性粉煤灰基地聚合物注浆材料用于绿色道路工程
由于火山灰活性低,粉煤灰通常需要高温维护,这极大地限制了粉煤灰的应用。采用适宜的碱活化剂和偏高岭土对粉煤灰基地聚合物进行室温改性,制备了粉煤灰基地聚合物注浆材料。正交试验结果表明,偏高岭土含量对材料的1、7、28 d力学性能影响最为显著。确定最佳配比为偏高岭土含量(mMK/mP)=15%,水玻璃模量(Ms)=1.0,水玻璃含量(mSS/mP)=50%。材料在1、7、28天的抗压强度分别为12.6、24.9、36.3 MPa。x射线衍射、傅里叶变换红外光谱、压汞孔隙度测定和扫描电镜分析结果表明,粉煤灰的反应机理是受到双向碱性攻击。同时,未反应的粉煤灰颗粒也证明了粉煤灰的惰性。偏高岭土大部分溶解形成N-A-S-H凝胶,提高了地聚合物的机械强度。本研究研制的材料在抗压强度和流动性方面均满足道路注浆用无机胶凝材料的规范要求,扩大了粉煤灰的使用量,有利于环境保护。
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来源期刊
CiteScore
3.70
自引率
16.70%
发文量
44
审稿时长
>12 weeks
期刊介绍: Engineering Sustainability provides a forum for sharing the latest thinking from research and practice, and increasingly is presenting the ''how to'' of engineering a resilient future. The journal features refereed papers and shorter articles relating to the pursuit and implementation of sustainability principles through engineering planning, design and application. The tensions between and integration of social, economic and environmental considerations within such schemes are of particular relevance. Methodologies for assessing sustainability, policy issues, education and corporate responsibility will also be included. The aims will be met primarily by providing papers and briefing notes (including case histories and best practice guidance) of use to decision-makers, practitioners, researchers and students.
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