| Energy conservation and environmental protection is one of the main trends of social development,and building energy conservation is one of the important indicators to measure a building’s excellence.The research and application of energy-saving and environment-friendly building materials is particularly important.Rice husk,as a kind of agricultural by-product,has the advantages of light weight,low thermal conductivity and renewability,which can produce huge social benefits in building materials.At the same time,the popularization of building industrialization has led to the emergence of a large number of new light and high-strength assembly plates with excellent performance,but there are also some deficiencies such as the insufficient strength and poor impermeability of the plates.In this paper,by analyzing the main problems above,a new type of decorative board is prepared to solve the above problems.First of all,through the study of the physical and mechanical properties and durability of rice husk powder cement materials,an optimal material mix ratio is obtained.Then,the decorative materials are prepared into decorative board and tested.The main research contents and conclusions are as follows:(1)The dry density and water absorption of rice husk powder cement materials are most affected by the amount of rice husk powder.The higher the content of rice husk powder is,the lower the dry density of rice husk powder cement material is,the higher the water absorption is.The strength of rice husk cement material decreased with the increase of rice husk powder content,and when the content was more than 30%,the rate of strength reduction increased obviously.The effect of rice husk size on the flexural strength is relatively small.It was found by SEM that there were micro cracks on the interface between rice husk powder and cement paste,and the hydration products around the transition zone were coarse and loose.(2)It is found that the physical and mechanical properties of rice husk cement can be improved by the modification of polypropylene fiber and silica fume.With the same amount of polypropylene fiber,the modified material increases first and then decreases with the increase of fiber length,the optimal amount is 1%;with the same length of polypropylene fiber,the strength increases first and then decreases with the increase of the amount,the optimal length is 9mm.With the increase of the content of silica fume,the strength of the modified material increases first and then decreases,and the optimal content is 15%.(3)Through a series of durability tests,it is found that the durability of the specimen is closely related to the internal structure of the specimen.There are different degrees of micro cracks and pores in the specimen used in this test.In the process of frost resistance and sulfate resistance test,these cracks can provide a certain space for volume expansion in the early stage of the test.With the larger volume expansion in the later stage of the test,these cracks will continue to expand,resulting in poor durability.(4)finite element numerical simulation analysis of the window-opening external panel and non-opening external panel is carried out.Results show that there is similar flexural bearing capacity between the window-opening external panel and non-opening external panel,but the rigidity of the window-opening external panel decreases relatively.(4)According to the specifications,the basic parameters and physical and mechanical properties of the prepared decorative board were tested.The test results show that the performance of the decorative board meets the requirements of the specifications.The decorative board and rice husk mortar wall board are poured layer by layer to form an integrated wall board.Through the test of simulating wind load on the wall board,when the load is 11.48 k N/m~2,the wall board begins to crack.After the wall panel breaks,it is found that the decorative layer and the wall panel layer are well combined without peeling off. |
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