Thermomechanical properties of cementitious composites with the addition of carbonyl-rich graphene oxide

Abstract This study evaluated the technical feasibility of incorporating 0.02% carbonylated graphene oxide (CGO) into 35 MPa concrete under temperature gradients of room temperature, 300 °C, 600 °C, and 900 °C. The results showed that CGO improves mechanical and microstructural properties at high temperatures, primarily due to its active carbonyl groups, which enhance cement hydration. The addition of CGO reduced the formation of pores and voids compared to control samples under elevated temperatures. Ultrasonic pulse velocity decreased with higher temperatures, indicating increased porosity. Despite reduced strength at 600 °C and 900 °C, CGO supported water retention, prevented crack propagation, and accelerated cement hydration without inducing new crystalline phases. Additionally, CGO improved physical and mechanical properties, especially at 300 °C. These findings suggest that CGO has the potential to contribute to the development of advanced construction materials with superior performance under high-temperature exposure.