Study on the Initial Microstructure and Flow Properties of Fibre-influenced Cemented Fillers
In order to investigate the effect of polypropylene fibres and glass fibres on the initial microstructure and flow properties of the cemented filler,the slump and extension were used to characterise the slurry flowability,and the initial microstructure of the doped and un-doped fibre filler was analysed using SEM and nuclear magnetic resonance(NMR)equipment.The results show that fibre incorporation negatively affects the flowability of the filling slurry,specifically presenting glass fibre(BL)＞hybrid fibre(HB)＞polypropylene fibre(JBX).In addition,the slump and extensibility of the slurry basically follow a decreasing primary function with increasing cement content.Fibres are effective in hindering the generation of pore cleavage,but the type of fibre does not significantly affect the microstructure of the filler.Also the higher the cement content,the denser the internal structure of the matrix.The NMR results showed that the maps of the filled bodies showed three peaks,and the fibre-doped filled bodies had lower signal intensity and smaller total area of the peaks compared with the fibre-free filled bodies,and the area of the first peak increased,while the area of the second and third peaks decreased.The conclusions of the study can provide a theoretical reference basis for the application of fibre reinforcement technology in mines.
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