Investigate the Mechanical Characteristics and Microstructure of Fibrous-Geopolymer Concrete Exposure to High Temperatures

Articles in Press

Document Type : Regular Paper

Authors

1 Department of Civil Engineering, Structure Engineering, Faculty of Engineering, Tikrit University, Iraq

2 Department of Civil Engineering, Building Constriction Material, Northern Technical University, Iraq

Abstract

The main objective of this study is to evaluate the mechanical properties of geopolymer concrete (GPC), made from alkaline-activated fly ash and Ground Granulated Blast Furnace Slag (GGBS), compared 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.

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Journal of Rehabilitation in Civil Engineering

Articles in Press, Accepted Manuscript
Available Online from 15 January 2025

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History

  • Receive Date: 28 July 2024
  • Revise Date: 13 November 2024
  • Accept Date: 15 January 2025

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