Chen, Yanyan and Zou, Chuanlong and Yong, Chee Lok and Jan, Richard Juat Shin and Tan, Tee How and Lin, Jiayi and Mo, Kim Hung (2024) Utilization of waste glass as precursor material in one-part alkali-activated aggregates. Journal of Materials Research and Technology-JMR&T, 33. pp. 5551-5558. ISSN 2238-7854, DOI https://doi.org/10.1016/j.jmrt.2024.10.204.
Full text not available from this repository.Abstract
The increasing demand for glass products has led to a rise in waste glass (WG), which is commonly disposed of in landfills, causing environmental degradation. Moreover, the direct adoption of a high volume of WG as aggregates in concrete can lead to unfavorable ASR expansion due to its high level of reactive silica. This study explores a one-part alkali activation method to produce WG-based aggregates, aiming to reduce the reactive silica content, mitigate ASR expansion and increase the recycling rate of WG. Waste glass powder (WGP) with a replacement ratio of 100% was combined with two different alkalis (sodium metasilicate pentahydrate (Na2SiO3.5H2O) and sodium aluminate (NaAlO2)) through the cold-bonded one-part alkali activation method to produce WG-based alkali-activated aggregates (WG-AAAs). The influence of various activator contents (0%, 6%, 9%, 12% and 15%) on the physical and mechanical properties of the WG-AAAs was investigated. The WG-AAAs had a bulk density ranging from 920 to 1010 kg/m3, which can be classified as lightweight aggregates. The WGAAAs with 12% NaAlO2 showed the best performance, with a water absorption of 8.46% and single particle crushing strength of 3.19 MPa. SEM-EDS and XRD results indicated that WG-AAAs with the supply of alumina from NaAlO2 exhibited a lower Si/Al ratio, leading to the formation of C-(N)-A-S-H gel, which improved the strength and creating a denser microstructure. Furthermore, the WG-AAAs showed no ASR expansion concerns, conforming to the expansion limit specified in ASTM C1260.
| Item Type: | Article |
|---|---|
| Funders: | Basic Ability Improvement Project for Young and Middle-aged Teachers in Colleges and Universities in Guangxi (2023KY1865), Universiti Malaya (MG013-2023) |
| Uncontrolled Keywords: | Waste glass; Artificial lightweight aggregate; Cold-bonded aggregate; One-part alkali activation; Alkali-silica reaction; Microstructure |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Faculty of Engineering > Department of Civil Engineering |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 18 Feb 2025 02:47 |
| Last Modified: | 18 Feb 2025 02:47 |
| URI: | http://eprints.um.edu.my/id/eprint/47396 |
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