| In response to the call of national assembly building,Gansu Third Construction Group Corporation invested in the construction of 100000 square meters assembly type steel structure support house project in Lanzhou New Area.All the internal partition boards used in the project are assembly type composite sandwich wall boards produced by Gansu construction investment new material Co.,Ltd.With the vigorous development of building energy-saving materials,thermal insulation materials came into being.Due to the poor fire resistance of organic materials,when there is a fire,organic thermal insulation materials will spread rapidly,so inorganic thermal insulation materials are favored by researchers and construction industry in various countries.As an inorganic thermal insulation material,foamed concrete has become the research target of researchers.However,its compressive strength is far lower than that of ordinary concrete,it cannot be used as a bearing structure and maintenance structure alone.When it is combined with high-strength mortar panel,steel wire mesh and glass fiber grid cloth to form a composite sandwich wall panel,the advantages of thermal insulation of foamed concrete can be effectively utilized to weaken the disadvantages of low compressive strength.In order to expand the application of prefabricated composite wallboard in the construction industry,this paper mainly studies its mix proportion,relevant performance and production technology in the following aspects:（1）Firstly,the mix proportion optimization test is carried out on the core material of the composite sandwich wall panel,and the influences of fly ash content,foam stabilizer content,temperature and rubber powder content on the related properties of the core material of the composite sandwich wall panel under different water cement ratios are studied.The pore diameter of the foam concrete is measured by combining the defect detection function of the ultrasonic detector and the porosity of the foam concrete is calculated by using the Image-Pro Plus software.The test results show that when the water cement ratio of foam concrete is 0.6,the content of fly ash is 25%,the content of foam stabilizer is 0.5 kg/m3,the foaming water temperature is 37℃,and the content of rubber powder is 1.0%,its relevant performance is the best,and it is the best mixture ratio.（2）Durability research is carried out on the optimized foam concrete mixture ratio,mainly including temperature alternating test research and dry-wet cycle test research.Durability indexes are relative dynamic elastic modulus,mass loss rate and crack propagation degree.The test results show that JF1-2 specimens mixed with rubber powder have larger relative dynamic elastic modulus,smaller mass loss rate,no large cracks,and the pore diameter is about 1.7mm with uniform pores than FM1-3 specimens not mixed with rubber powder.（3）Mix proportion optimization test was carried out on mortar panel of composite sandwich wallboard,and its dry density,flexural strength,compressive strength and mortar tensile bond strength were measured.（4）The production of composite sandwich wallboard is carried out on the production line by adopting the optimized mixture ratio of foam concrete and mortar panel.Through the surface density test,compressive strength test and softening coefficient test,the fly ash content,cellulose content,the arrangement and maintenance mode of steel wire mesh and glass fiber grid cloth are optimized.（5）The freeze-thaw cycle durability test was carried out on the preferred composite sandwich wallboard.The durability indexes are the relative dynamic elastic modulus,mass loss rate and crack propagation degree.The test results show that after300 freeze-thaw cycles,the relative dynamic elastic modulus of the film-coated cured wallboard is larger than that of the non-film-coated cured wallboard,the mass loss rate is smaller,and no cracks appear in the film-coated cured wallboard. |
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