Preparation and physicochemical properties analysis of fly ash based grouting fire extinguishing material
During the stacking process,coal gangue accumulates heat and is prone to spontaneous combustion.In addition,fly ash,as a solid waste generated by coal-fired power plants,has adverse effects on the environment during the accumulation process.Therefore,in order to solve the current situation of spontaneous combustion in gangue hills,fly ash is chosen as the main matrix to prepare grouting fire extinguishing materials,in order to achieve the goal of"treating waste with waste".In order to ensure that such spontaneous gangue hills are completely extinguished and not re-ignited,this article takes spontaneous gangue hills as the research object,starting from the fire extinguishing and re-combustion materials,combining the characteristics of fly ash,considering local materials,and using the fly ash discharged from the industrial park as the main raw material,so as to prepare a stable performance of fly ash-based grouting material,which is used to extinguish spontaneous combustion gangue hills.Research has been carried out from the aspects of raw material formulation design,material physical and chemical properties,etc.The four factors of water-cement ratio,solids ratio,water glass in cement mass fraction and lime content have been investigated on the fluidity,viscosity and water separation of the grouting fire extinguishing material.According to the influencing rules of performance indicators such as the rate,it is concluded that the best raw material ratio for each performance is:water-cement ratio 0.6,fly ash content 70％,lime content 20％and water glass accounted for 6％of the cement mass fraction.The influence of experimental temperature on the water loss of loess-based grouting materials,lime-based grouting materials and fly ash-based grouting materials is discussed.The comparative analysis shows that the water loss rate of fly ash-based grouting materials is low and water retention performance is better.
grouting fire extinguishingfly ashphysical and chemical propertieswaste treatmentpollutionremediation
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