Mechanical properties of alkali activated slag binder based concrete at elevated temperatures
Abstract Fire is a major hazard that significantly compromises structural integrity, especially by degrading the performance of concrete at elevated temperatures. As the temperature increases, the microstructure of conventional concrete deteriorates, resulting in substantial strength loss. To addres...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Springer
2025-08-01
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| Series: | Discover Sustainability |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/s43621-025-01542-w |
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| Summary: | Abstract Fire is a major hazard that significantly compromises structural integrity, especially by degrading the performance of concrete at elevated temperatures. As the temperature increases, the microstructure of conventional concrete deteriorates, resulting in substantial strength loss. To address this, this study investigates the high-temperature performance of alkali-activated slag Concrete (AASC) made from 94% ground granulated blast-furnace slag (GGBFS) and 6% alkali activator. In contrast to conventional Portland-based concretes, AASC exhibits superior thermal stability and mechanical properties, contributing to improved resilience and environmental sustainability. After 28 days of curing, AASC exhibited compressive, split tensile, and flexural strengths of 32.54 MPa, 4.9 MPa, and 4.9 MPa, respectively, representing improvements of 11.78%, 4.26%, and 8.51% over Portland Slag Cement (PSC) concrete. Under elevated temperatures up to 800 °C, AASC retained greater residual strength, with compressive strength losses of 3.84–72.43%, compared to 10.54–78.16% for PSC and 3.17–96.69% for OPC43. AASC also exhibited lower mass loss across specimen types, confirming its superior thermal resistance. These findings affirm the potential of GGBFS-based AASC as an eco-efficient, fire-resilient material for sustainable infrastructure applications. |
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| ISSN: | 2662-9984 |