Study on fractal characteristics of graphene oxide modified coral mortar crushing under impact loading
To study the damage mode and formation mechanism of coral mortar modified with different dosages of graphene oxide(GO)under impact loading,impact compression tests at three strain rates were carried out using a φ50 mm split Hopkinson press bar(SHPB),and the microscopic characteristic changes were obtained by scanning electron microscopy.The results show that:different from the overall damage mode of ordinary coral mortar,modified coral mortar reduces the initial defects inside the mortar due to the template effect of GO,so that its damage mode is gradually transitioned to the overall damage from the local spalling damage and core-retention damage,and the average grain size is larger under the same strain rate level;similar to ordinary coral mortar,the fractal characteristics of modified coral mortar fragments are obvious and the fractal dimension is positively correlated with the strain rate,while the dynamic compressing strength,impact toughness,and impact strength of modified coral mortar are also positively correlated with the strain rate.Dynamic compressing strength,impact toughness and energy consumption are positively correlated with the fractal dimension;GO doping more than 0.03％will inhibit the hydration reaction of coral mortar,resulting in the fractal dimension decreasing and then increasing with the increase of GO doping.
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