Research On Basic Gradation Of Foamed Concerete With Coal Gangue

The mining technology of coal mines is affected by the high cost of filling and the low efficiency of coal mining,and its development has been severely constrained.In recent years,the accumulation of large amounts of waste coal gangue has caused serious environmental pollution problems,while making coal The continuous increase in the cost of vermiculite treatment has prompted the related research on coal gangue to increase further.Because foamed concrete has the advantages of low density,light weight,low cost,etc.,the development of gangue foamed concrete for filling has important economic value for mine filling production,and at the same time effectively reduces The environmental pollution of the coal gangue in the mining area meets the national requirements for green mining of coal mines.At present,the research on coal gangue foam concrete mainly focuses on the effect of additives on its mechanical properties,water absorption,thermal conductivity,and other related properties.However,the research on the effect of particle size and grade-matched foam concrete performance on coal gangue is still underway.No,due to the obvious influence of aggregate-level aggregates on concrete performance,it is necessary to carry out basic research on the particle size and gradation of coal gangue.It is of important reference value for gangue foam concrete for trial filling and is beneficial to gangue foam concrete.Filling application and development in the mine.The research content of this project is mainly divided into three stages.In the initial stage,the main research is to analyze the experimental materials coal gangue,foaming agent sodium lauryl sulfate and foam stabilizer modified silicone polyether emulsion;in the middle stage,the coal gangue particles are mainly The grading and particle size gradation theory were studied and the grading and classification were calculated;the trial of coal gangue foam concrete and performance research and cost analysis were conducted later.The experimental study found that the foaming agent K-12 solution concentration at 0.46%when the best foaming effect,the use of electric stirrer foaming method can make the foaming factor of 29 times,in the solution added stabilizer foam modified silicon The concentration of the resin polyether microemulsion was 0.067%.The foam settlement distance was the smallest and had no influence on the amount of water in the foam.The test found that the compression zone of the coal gangue foam concrete was longer in the plastic zone,after reaching the yield strength,Coal gangue foam concrete has a significant retarding effect on the load,which is related to the internal porous structure of foam concrete.When the foam content is one-half the cement quality,the best amount of coal gangue is 60%,and the best water-cement ratio is.0.2,and the best gradation is n=0.3.The density of the coal gangue foamed concrete to be tested is 1.44 g/cm3,the slump is 10.6 cm,the elastic modulus is 530 MPa,and the compressive strength reaches the maximum.The compressive strength is 6Mpa.At this time,the coal gangue particle grading effect is the best.Compared with the ordinary concrete,replacing the sand with gangue to configure the foam concrete can save the cost of about 47.3 yuan,which can effectively save the filling cost and indirectly increase the Work efficiency brings economic benefits for mine filling and mining,and improves the environment in mining areas.