Influence And Analysis Of Physical Foaming System On Properties Of Foam Concrete

Foam concrete is a new lightweight inorganic insulation material made of cement paste,foam and admixture.Because of its excellent thermal insulation and fire resistance,it can also reduce environmental pollution,so its application can replace the traditional organic thermal insulation materials.At present,there are few studies on the application of nano particles to foam concrete at home and abroad.Therefore,this paper mainly discusses the mechanical properties,durability and microstructure and mechanism analysis of foam concrete,in order to meet the requirements of the specification,around the effects of hydroxypropyl methyl cellulose,sodium aluminate,polypropylene fiber,nano NS particles and aerogel particles on the performance of foam concrete.Systematic research.The research results can provide theoretical basis and technical support for the practical application of thermal insulation materials.The main experimental work and research results are as follows:1.the influence of different concentration of foaming agent solution on foam foaming ratio,sedimentation distance and bleeding volume was studied through experiments.Conclusion the addition of proper amount of animal protein foaming agent will increase the stability of the foam system.The concentration of animal protein solution is 5%,the best proportion is 20%,the sedimentation distance is reduced by 25.3%,and the bleeding volume is reduced by 7.7%compared with the concentration of 2%.2.The effects of single hydroxypropyl methyl cellulose,sodium aluminate and polypropylene fiber on the properties of foam concrete were studied through experiments.Based on this,orthogonal design and experiment were carried out to determine the optimum mixing ratio of three mixed admixtures and the order of influencing factors.The mixing ratio of admixture was hydroxypropyl methyl cellulose 0.24%,sodium aluminate 0.55%,polypropylene fiber 0.2%,and mechanical strength.The most influential factor is polypropylene fiber,and the most influential factor on density and water absorption is HPMC.3.the mechanical properties,thermal insulation properties,microstructure and mechanism of foam concrete were studied by adding nano NS.The introduction of nano NS can effectively refine the bubble size and form a stable foam system.The water absorption and thermal conductivity will be reduced,and the dry density,compressive strength and one-dimensional water absorption will be improved to some extent.Compared with the control group,the dry density of NS nanoparticles increased 7.2%,the compressive strength increased 80.6%and the water absorption decreased 37%.4.aerogel particles were prepared by sol-gel and atmospheric drying method.The silicic acid ethyl ester(TEOS)was used as silicon source to form three stages:hydrolysis condensation,aging modification and atmospheric drying.The performance parameters were density 170 Kg/m~3,porosity 94%,thermal conductivity 0.018 W/(m k),and contact angle greater than 140 degrees.5.To explore the mechanical properties,thermal insulation properties,microstructure and mechanism of foam concrete with single aerogel,and compare with the excellent properties of single doped nano NS,it is concluded that the stability of foam can be improved due to the aggregation of aerogel particles in the Platon channel.When aerogel mass content was 5.5%,it was the best mixing ratio.Compared with nano NS particles,the dry density of the control group decreased by22.3%,the thermal conductivity decreased by 9.3%,and the compressive strength decreased by 38.4%.Therefore,the aerogel incorporation optimizes the thermal insulation and light weight of the material.Although the mechanical properties decrease,it can still meet the requirements of the specification.