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Transformation of Waste Glasses in Hydroxide Solution
Przemysław Czapik1, Katarzyna Borek1
1Faculty of Civil Engineering and Architecture, Kielce University of Technology, Al. Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, Poland.
Materials (Basel, Switzerland)
|December 31, 2025
Summary
Waste glass is a valuable construction material. This study shows that soda-lime glass powders react in alkaline solutions, confirming their pozzolanic reactivity for potential reuse in construction.
Area of Science:
- Materials Science
- Civil Engineering
- Waste Management
Background:
- Unused glass waste is a significant environmental concern.
- Glass waste can be repurposed as a secondary raw material in construction.
- Alkaline environments are crucial for pozzolanic reactions in cementitious materials.
Purpose of the Study:
- To investigate the chemical and structural changes in soda-lime container glasses.
- To assess the pozzolanic reactivity of waste glass in alkaline conditions.
- To understand how glass composition affects its transformation in construction material production.
Main Methods:
- Analysis of three different colored container glass powders.
- Exposure of glass powders to calcium hydroxide (Ca(OH)2) and sodium hydroxide (NaOH) solutions.
- Characterization using X-ray diffraction (XRD), differential thermal and thermogravimetric analysis (DTA-TG), and scanning electron microscopy (SEM).
Main Results:
- All tested glass powders demonstrated pozzolanic reactivity.
- Differences in reaction product composition and transformation kinetics were observed among glass types.
- The study confirmed the potential for waste glass utilization in construction materials.
Conclusions:
- Waste glass exhibits pozzolanic behavior in alkaline environments relevant to construction.
- Understanding glass composition is key to optimizing its use in new materials.
- This research supports the effective recycling of glass waste in the construction industry.
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