期刊
CERAMICS INTERNATIONAL
卷 47, 期 8, 页码 10773-10785出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.12.194
关键词
Geopolymer; Mine tailing; Cyclic loading; Damage and cracking
资金
- Universidad Nacional de San Agustin (UNSA) through the Joint Center for Mining Sustainability
- Colorado School of Mines
Geopolymerized mine tailings can be used for construction materials with significant strength values, but their exposure to cyclic loading is a potential hazard. This study found that NaOH molarity significantly affects the elastic and plastic strains of geopolymer specimens. The Young's modulus of geopolymers shows an increase followed by a decrease with cycles, influenced by the NaOH molarity.
Geopolymerized mine tailings (MTs), as an alternative to reuse the mine wastes, can be used for construction materials (e.g., geopolymer concrete and bricks) depending on their mechanical properties. Their strength values, which can range from a couple of MPa to tens of MPa, are significant evidence for their application in the construction industry. In practice, geopolymers activated with different NaOH molarities can significantly affect the mechanical properties of MTs. The mechanical behavior of geopolymers under monotonic loading also has been widely investigated. However, the potential hazard of the exposure of geopolymer concrete/bricks to cyclic loading has received limited attention. This paper presents a study we conducted on geopolymers made by activation of MTs under cyclic loading to understand their crack and damage behaviors, including the influence of factors such as NaOH molarity and loading patterns. The influence of NaOH molarity on the elastic and plastic strains of the geopolymer specimen at different cycles was explored. A series of unconfined compression tests of cubic specimens with different NaOH molarities as well as microscopic investigations and observations via XRD, FTIR, and SEM were carried out in this study. The Young's modulus of the geopolymer was found to increase followed by a decrease with the cycles for all the selected NaOH molarities. The geopolymers activated with lowest NaOH molarity were first to start damage and activated with the highest NaOH molarity were the last to damage. The damage variable was shown to increase rapidly at the initial cycles and then gradually approached the maximum value.
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