Concrete Preparation And Performance Analysis Of Composite Insulating Under Coal

With the rapid development of economy,the demand of mineral resources is increasing day by day,and the energy crisis has become a difficult problem to be solved urgently in our country.And China is a big country of coal,coal is the most abundant basic energy resources,in order to solve the energy crisis,a lot of coal mining has become an inevitable trend.But the quantity of coal reserve in many shallow coal mines has been in short supply,which forces the mining depth to increase year by year.The problem of rock and soil mechanics has become more and more complicated,which has become an important problem of mine safety production.The high temperature working environment caused by mine heat damage will seriously affect the health of workers,lead to a series of diseases,resulting in low efficiency and safety accidents.Therefore,it is urgent to solve the problem of mine heat damage.At present,the prevention of mine heat damage is mainly based on passive cooling,that is,the cooling of high temperature mine by ventilation and artificial refrigeration technology.This method of passive cooling plays a very good effect,but also has the disadvantages of high cost,complex technology,palliatives etc..The disadvantage of passive cooling based on the subject of mine heat harm control from another point of view,that is the main block of deep roadway surrounding rock-heat source heat,through the deep tunnel wall spray glazed hollow bead and ceramisite concrete insulation to the surrounding rock to slow cooling,in order to reduce the air temperature in deep roadway,reduce the effect of the thermal damage.This kind of active cooling method is more than the passive cooling methods such as artificial refrigeration technology,which not only greatly reduce the cost,but also from the source to control the surrounding rock heat.Effectively solve the problem of mine heat damage.The specific work of this paper is as follows:(1)Modification of glazed hollow bead were modified,which laid the foundation for experimental study on thermal insulation glazed hollow bead and ceramisite concrete.(2)Based on the orthogonal design theory,18 sets of mixing ratio were designed by orthogonal design table,and their compressive strength and thermal conductivity were measured respectively.The experimental data were analyzed by comprehensive balance method,comprehensive score method and variance analysis method.analysis.The influence of cement content,the amount of vitrified microbeads,the amount of sand,the amount of shale ceramsite,the amount of stone and the amount of vitrified fiber on the thermal conductivity,compressive strength,And the optimal mix ratio of the thermal insulation concrete was determined by the analysis of the three methods and the economic test.The strength test was carried out to verify the correctness of the mixture ratio,Compressive strength of 28.02Mpa thermal conductivity of 0.22 W/(m ·K)of the glass with ceramic beads of ceramic composite insulation.(3)To establish the theoretical formula for thermal conductivity,and the measured thermal conductivity values were compared.