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Corresponding Author

Hala Emad Elden Fouad

Subject Area

Material Science and Engineering

Article Type

Original Study

Abstract

Global warming is pressing issue, primarily driven by increasing in greenhouse gas emissions with CO2 accounting for 64% of total emissions. It was founded that produce one ton of Ordinary Portland Cement (OPC) producing one ton of CO2. To address these issues, geopolymers derived from fly ash (FA) have been proposed as a superior alternative to cement. This research presents a comparative review of OPC and FA-based geopolymers in the context of CO2 sequestration. The research investigates the behavior of FA-based geopolymer cement, focusing on the influence of preparation conditions on its mechanical performance, bond strength, and the effect of thermal conditions on its compressive strength. Three geopolymer concrete (GPC) mixtures, Con 2FA, Con 3FA, and Con 4FA, were selected for examination, with FA contents of 400, 450, and 500 kg/m³, respectively. The material was then exposed to elevated temperatures of 250°C, 450°C, and 650°C for two hours. Additionally, the microstructure of the geopolymer concrete (GPC) was analyzed. The comparison concluded that increasing the FA content in GPC enhances its technical properties. Furthermore, the 28-day bond strength of GPC is slightly higher than that of OPC. Moreover, when GPC is exposed to elevated temperatures, its compressive strength increases by 8% and 14% at 250°C and 450°C, respectively. However, at 650°C, the GPC samples showed an 11% reduction in compressive strength compared to their strength at ambient temperature. And the last thing, microstructural analysis reveals that GPC maintains a highly stable mineral composition after exposure to elevated temperatures, outperforming OPC in this regard

Keywords

Geopolymer (GPC), alkali activator, Fly Ash (FA), mechanical properties, bond strength, thermal behavior

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

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