Effects of Graphene Oxide on the Mechanical and Microscopic Characteristics of Cement-Based Plugging Material for Preventing Spontaneous Combustion of Coal

摘要

This study added graphene oxide into a cement-based plugging material to prevent spontaneous combustion of coal by efficiently plugging the cracks in coal and rock mass. The novel plugging material was prepared based on cement, fly ash, graphene oxide (GO), and other additives. In this paper, the effect of GO nanomaterials on the properties of plugging material was investigated by analyzing the physicochemical structure, surface morphology, and mechanical strength of the composite. This new composite showed better surface quality with a dense surface and decreased pore volume, which indicated that addition of GO affected the pore structure to further impede oxygen diffusion. Fourier transform infrared spectroscopy (FTIR) results revealed that the cement-based plugging material with GO formed a cross-linked structure, especially with 0.03 wt % GO addition. Moreover, the hydration products analyzed by X-ray diffraction (XRD) demonstrated that GO promoted the hydration degree to enhance the compactness of the composite to optimize the pore structure and improve the plugging capacity. This study proposed a new pathway to enhance the strength and modify the microstructure of the plugging material by adding the GO nanomaterial.