Study on Mechanical Properties of a Fine Aggregate Fly Ash Based Filling Grouting Specimen
In order to reduce the environmental pollution caused by the accumulation of coal gangue and fly ash,and promote the application of fly ash and coal gangue in filling grouting materials,aiming at the problem of high cost of cement-based grouting materials,he effects of different coal gangue and fly ash ratios on the fluidity,water separation rate,setting rate,initial and final setting time and compressive strength of filling grouting specimens were studied by experimental method.The results show that the content of coal gangue is positively correlated with the water separation rate and negatively correlated with the setting rate.The fluidity increases gradually with the increase of coal gangue content,and the initial and final setting time decreases continuously with the increase of coal gangue content.When the content of coal gangue is 60%,the peak strength of coal gangue-fly ash-cement grouting specimen is the largest,the peak strain is the smallest,and the surface cracks and spalling zones of grouting specimen are less.Coal gangue fine materi-al has a great influence on slurry segregation and stone shrinkage,which can reduce the setting time of grout-ing material.Under the condition of 40%cement content,the ratio of fly ash to coal gangue of 2∶3 is the best ratio of grouting material.
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