Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

A Review of Geopolymer Concrete's Resistance to High Temperatures

Document Type : Review

Author
Assistant professor, Department of Civil and Environment Engineering, AmirKabir University of Technology, Tehran, Iran
Abstract
Geopolymer is recognized as an alternative to ordinary Portland cement (OPC) due to its lower carbon emissions during production, higher strength, and good durability. Its inorganic framework determines its resistance to high temperatures. This paper presents a physico-chemical transformation of geopolymer under elevated temperatures, focusing on processes such as hydration, dehydroxylation, phase changes, pore structure alterations, and thermal shrinkage. These transformations explain its better resistance to high temperatures compared to ordinary Portland cement. Changes in the mechanical strength of geopolymer concrete and the mechanisms behind its increased/decreased resistance at high temperatures are summarized. Internal factors influencing the resistance to high temperatures in geopolymer concrete are comprehensively reviewed, including the choice of precursors, type of alkali cations, Si/Al ratio in the geopolymer system, and aggregate materials. The addition of certain additives and fibers can enhance the high-temperature performance of geopolymer concrete. Some researchers have investigated the high-temperature performance of geopolymer, and their efforts are reviewed comprehensively here. The insights provided in this paper will be valuable for researchers and engineers aiming to conduct further studies and applications in the field of high-temperature resistance of geopolymer.. . . . . . . . . . . . . . . . .
Keywords

Subjects


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  • Receive Date 30 August 2021
  • Revise Date 14 November 2021
  • Accept Date 06 December 2021