Title
Recycling of Aluminosilicate-Based Solid Wastes through Alkali-Activation: Preparation, Characterization, and Challenges
Author
Feng, Lichao (Jiangsu Ocean University)
Yi, Shengjie (Jiangsu Ocean University)
Zhao, Shuyuan (Harbin Institute of Technology)
Zhong, Qiucheng (Jiangsu Ocean University)
Ren, Feirong (Jiangsu Ocean University)
Liu, C. (TU Delft Materials and Environment)
Zhang, Y. (TU Delft Materials and Environment)
Wang, Wenshou (University of Jinan)
Li, Zhenming (University of Sheffield)
Date
2024
Abstract
Recycling aluminosilicate-based solid wastes is imperative to realize the sustainable development of constructions. By using alkali activation technology, aluminosilicate-based solid wastes, such as furnace slag, fly ash, red mud, and most of the bio-ashes, can be turned into alternative binder materials to Portland cement to reduce the carbon footprint of the construction and maintenance activities of concrete structures. In this paper, the chemistry involved in the formation of alkali-activated materials (AAMs) and the influential factors of their properties are briefly reviewed. The commonly used methods, including X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TG), nuclear magnetic resonance spectroscopy (NMR), and X-ray pair distribution function technology, to characterize the microstructure of AAMs are introduced. Typical characterization results of AAMs are shown and the limitations of each method are discussed. The main challenges, such as shrinkage, creep, efflorescence, carbonation, alkali–silica reaction, and chloride ingress, to conquer for a wider application of AAMs are reviewed. It is shown that several performances of AAMs under certain circumstances seem to be less satisfactory than traditional portland cement systems. Existing strategies to improve these performances are reviewed, and recommendations for future studies are given.
Subject
slag
fly ash
alkali-activation
microstructure
performance
challenges
To reference this document use:
http://resolver.tudelft.nl/uuid:935cc7ae-158a-4b98-a142-f2ec0240a768
DOI
https://doi.org/10.3390/buildings14010226
ISSN
2075-5309
Source
Buildings, 14 (1)
Part of collection
Institutional Repository
Document type
review
Rights
© 2024 Lichao Feng, Shengjie Yi, Shuyuan Zhao, Qiucheng Zhong, Feirong Ren, C. Liu, Y. Zhang, Wenshou Wang, Zhenming Li, More Authors