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| Experimental study on the mechanical properties of crushed stone cemented by graphene oxide and cement-based composite grouting materials |
| GAO Yuan，JING Hongwen，YU Zixuan，WU Jiangyu，YIN Qian，FU Guangping |
| (State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China)
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Abstract In order to explore efficient and green grouting materials，the industrial-grade graphene oxide(GO) with a mass ratio of 0.03% of the cement-based slurry combined with fly ash with a mass ratio of 12.5% were mixed into cement-based grouting materials to strengthen the crushed stone. The uniaxial compression tests，acoustic emission(AE) monitoring and scanning electron microscopy(SEM) characterization，were then carried out to study the strength and deformation performance of the cemented specimens，and the macro-and micro-characteristics after the failure of the cemented crushed stone were investigated. The optimization effects and application prospects of GO on cement-based materials are discussed. The results show that the modified slurry can effectively increase the compressive strength of the cemented crushed stone by about 12.6%–22.5%. GO can promote the hydration reaction of cement and guide hydration products to grow on the surface of graphene nanosheets，thereby optimizing the pore structure in the grouting materials and reducing the micro-cracks between the slurry and the crushed stone interface. AE monitoring results，SEM characterization，and fractal analysis further revealed that the incorporation of GO could effectively reduce the degree of micro-damage of the sample during the failure process，ensure the integrity of the sample during the destabilization failure process after cemented，enhance the material toughness and reinforce its ability to resist the compressive load.
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2022, Vol. 41 
