Publications
Investigate the Mechanical Characteristics and Microstructure of Fibrous-Geopolymer Concrete Exposure to High Temperatures
Jan 15, 2025Journal Journal of Rehabilitation in Civil Engineering
DOI 10.22075/jrce.2025.34716.2141
The main objective of this study is to evaluate the mechanical properties of geopolymer concrete (GPC), which made from alkaline-activated fly ash and Ground Granulated Blast Furnace Slag (GGBS), in comparison to conventional M30 grade concrete. Additional samples of GPC incorporating steel fibers were also tested. To investigate the behavior of these materials under elevated temperatures (0°C, 250°C, 500°C, 750°C), thirty-six specimens were cast and tested, including cubes, cylinders, and prisms. These specimens comprised slag-based GPC (containing GGBS and fly ash) and standard M30 concrete. The results of the compressive strength tests indicated that GPC demonstrated 22.3% greater strength than conventional concrete. Furthermore, adding steel fibers to GPC enhanced its compressive strength by 61%. The split tensile strength of GPC was 71.8% higher than standard concrete, and GPC with steel fibers exhibited a 118.5% increase. Similarly, the flexural strength (modulus of rupture) increased by 22% for GPC and 54% for GPC reinforced with steel fibers, compared to conventional concrete. Overall, the findings reveal that incorporating steel fibers significantly improves the mechanical properties of slag-based GPC, particularly in compressive, tensile, and flexural strength, making it superior to ordinary Portland cement (OPC)-based concrete.
A REVIEW ON GEOPOLYMER CONCRETE BEHAVIOUR UNDER ELEVATED TEMPERATURE INFLUENCE
Dec 15, 2024Journal Journal of Sustainability Science and Management
DOI http://doi.org/10.46754/jssm.2024.12.014
Issue eISSN: 2672-7226
Volume Volume 19 Number 12, December 2024: 239-259
Geopolymers are considered promising, environmentally friendly, and sustainable substitutes for ordinary Portland cement (OPC). Geopolymers exhibit commendable mechanical characteristics, including resistance to high temperatures and noteworthy environmental advantages. This review paper focuses on geopolymer concrete (GPC) and mortar behaviour under high temperatures, addressing problems, and improvement methods. The main problem considered is concrete spalling induced by fire which poses a significant threat to concrete structures, particularly those constructed with high-strength concrete. This review aims to elucidate the behaviour of geopolymer concrete under high temperatures and explore strategies to mitigate the impact of such conditions. Critical findings indicate that geopolymer concrete can maintain up to 80% of its compressive strength after exposure to temperatures as high as 800°C. Additionally, incorporating steel fibres into geopolymer concrete has been shown to enhance its residual compressive strength by up to 25% and significantly reduce spalling. These results underscore the potential of geopolymer concrete as a resilient material in fire-prone environments and highlight the benefits of using steel fibres to improve its performance under elevated temperatures.