Microstructural properties and compressive strength of fy ash‑based geopolymer cement immersed in CO2‑saturated brine at elevated temperatures

Ridha, S. and Dzulkarnain, I. and Abdurrahman, Muslim and Ilyas, S. U. and Bataee, M. Microstructural properties and compressive strength of fy ash‑based geopolymer cement immersed in CO2‑saturated brine at elevated temperatures. International Journal of Environmental Science and Technology.

Text Microstructural properties and compressive strength of fly ash-based geopolymer cement immersed in CO2-saturated brine at elevated temperatures.pdf - Published Version Download (1MB)

Abstract

Geopolymer cement has signifcance in several engineering applications due to improved physical and chemical charac�teristics compared to ordinary portland cement (OPC). However, the emphasis on petroleum industry for cementing is not well recorded under CO2 exposure. This experimental research aims to investigate the impact of CO2-saturated brine on geopolymer-based and OPC-based cement under elevated temperature. Fly ash-based alkali-activated cement is prepared, and cement slurry is cured at two diferent conditions (17.23 MPa/60 °C and 24.13 MPa/130 °C). The slurry is then submerged into CO2-saturated brine using autoclave chamber at supercritical CO2 conditions for 24, 72 and 96 h. Microstructure prop�erties are characterized using SEM, XRF, XRD, and IR. Compression strength is experimentally tested on cubical cement samples. A comparative analysis of fy ash geopolymer cement and OPC at varying conditions exhibits that microstructure and compressive strength of geopolymer cement show better performance. It signifes the potential of fy ash as a binder in sequestration cement for CO2 injection wells. This research suggests that the concentration of CO2 has a minor infuence on the degree of carbonation. However, the temperature is found to be a critical factor for microstructure and mechanical properties reduction in OPC in a CO2-rich environment.

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