Alkaline attack of boro-alumino-silicate glass: New insights of the molecular mechanism of cold consolidation and new applications
Abstrak
This paper focuses on the activation of boro-alumino-silicate glass from discarded pharmaceutical containers as fine powders suspended in relatively diluted alkaline solutions (2.5 M NaOH/KOH), followed by drying at 40 °C for 7 days. A specific molecular mechanism of glass hardening is proposed. Unlike geopolymers, the hardening does not result from the condensation of products of extensive dissolution. Instead, condensation reactions occur in hydrated surface layers, leading to strong bonds (Si-O-Si, Al-O-Si, etc.) between individual glass particles. Silicates, borates, and aluminates from glass dissolution combine with alkaline ions, yielding additional soluble phases. This mechanism is supported by the results of solid-state NMR spectroscopy and elemental analysis using ICP-OES. Stable matrices prepared by direct foaming or by the inclusion of cenospheres or commercial expanded glass (Poraver®) can be exploited for the fabrication of lightweight components
Topik & Kata Kunci
Penulis (9)
Giulia Tameni
Diana Lago
Hana Kaňková
Lenka Buňová
Jozef Kraxner
Dušan Galusek
Daniel M. Dawson
Sharon E. Ashbrook
Enrico Bernardo
Akses Cepat
PDF tidak tersedia langsung
Cek di sumber asli →- Tahun Terbit
- 2025
- Sumber Database
- DOAJ
- DOI
- 10.1016/j.oceram.2024.100726
- Akses
- Open Access ✓