Fly ash and waste brick powder-based one-part geopolymer foam concrete with enhanced thermal performance: A circular approach to construction and demolition waste utilization
Faraji, Md Foysal, Turkel, Ihsan, Ozkan, Iffet Gamze Mutevelli, Bayraktar, Oguzhan Yavuz, Kaplan, Gokhan, Bayram, Muhammed, Aydin, Abdulkadir Cuneyt, Ozbakkaloglu, Togay
Cement production's environmental impact necessitates sustainable alternatives. This study develops one-part geopolymer foam concretes (GFC) incorporating waste brick powder (WBP) and recycled fine aggregates (RFA) to address construction waste valorization and carbon reduction. Mechanical, thermal, and freeze-thaw durability properties were evaluated across WBP (0-40 %) and RFA (0-100 %) replacements. Results demonstrate that 40 % WBP (B40R0) achieves optimal mechanical performance, yielding 13 % higher 28 days compressive strength (4.5 MPa) and 14 % lower porosity (28.3 %) compared to the control mix, attributed to WBP's high Al2O3 content enhancing geopolymer crosslinking. Conversely, 100 % RFA (B40R100) minimizes thermal conductivity (0.246 W/m & sdot;K) but reduces 28 days compressive strength compared to the control mix due to interfacial porosity. Thermal durability tests (200-800 degrees C) reveal WBP-rich mixes retain structural integrity via crystallization, while freeze-thaw cycles show RFA increases mass loss (19.1 % after 50 cycles). The findings validate WBP-RFA geopolymers as viable for nonstructural applications, balancing thermal insulation (RFA) and mechanical robustness (WBP), advancing circular construction strategies.
- Dergi
- JOURNAL OF BUILDING ENGINEERING
- Yıl
- 2026
- Cilt
- 117
- eISSN
- 2352-7102
- DOI
- 10.1016/j.jobe.2025.114850
- WoS UID
- WOS:001641025200001