Alkali-activated concrete waste powder-based coating: Preparation, performance, and electrochemical resistance
The environmental challenges posed by concrete waste necessitate effective reutilization strategies. While conventional applications in building materials have been explored, leveraging concrete waste in high-performance contexts, such as steel protective coatings, presents a more valuable avenue. T...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-10-01
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| Series: | Developments in the Built Environment |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666165925001140 |
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| Summary: | The environmental challenges posed by concrete waste necessitate effective reutilization strategies. While conventional applications in building materials have been explored, leveraging concrete waste in high-performance contexts, such as steel protective coatings, presents a more valuable avenue. This research investigates the application of concrete waste powder (CWP) in the development of alkali-activated steel coatings using sodium silicate (Na2SiO3). The findings reveal that the performance of the resultant coatings is primarily influenced by the CWP/Na2SiO3 ratio and the silica modulus (Ms). Application of the optimized coating (CWP/Na2SiO3 = 40/60 wt%, Ms = 2) to steel reinforcement significantly improved chloride corrosion resistance (3.5–19.8 kΩ cm2) and reduced corrosion current density (45–1.1 μA/cm2). This study proposes a viable method for CWP valorization in demanding applications, contributing to sustainable construction waste management through enhanced material utilization and reduced environmental impact. |
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| ISSN: | 2666-1659 |