Experimental Study On Mechanical Properties And Beam Flexural Properties Of Binder Inorganic Composite Bamboo

With the increasing awareness of environmental protection,timber structures have once again come into focus.However,the low strength,large variability,and limited natural resources of wood materials severely restrict the development of timber structures,as they have a growth cycle of several decades or even centuries.Engineered bamboo structures,made from organic adhesives and bamboo,have overcome many of the problems associated with timber structures.However,organic adhesives exhibit low strength and can generate toxic substances in high-temperature environments,thereby impacting the application and promotion of engineered bamboo.Inorganic composite bamboo,made with magnesium oxy-sulfate inorganic adhesive,not only retains the excellent mechanical properties of traditional engineered bamboo but also exhibits good fire resistance and durability.Its production process does not involve toxic or harmful substances,making it a truly green,low-carbon,and pollution-free material that can be relied upon in the field of future construction.This study investigates the mechanical properties of inorganic composite bamboo,its mechanical properties after high-temperature treatment,and the bending performance of beams through material testing and beam bending tests,combined with theoretical analysis.The main contents are as follows:(1)Through compression tests,tensile tests,bending tests,and shear tests,material parameters such as compressive strength parallel to the grain,compressive strength perpendicular to the grain,compressive modulus of elasticity parallel to the grain,Poisson’s ratio,tensile strength,tensile modulus of elasticity,flexural strength,flexural modulus of elasticity,shear strength parallel to the grain,and shear strength perpendicular to the grain are explored.The failure forms and failure mechanisms are analyzed.(2)By conducting mechanical property tests on inorganic composite bamboo specimens treated at high temperatures,the influence of different treatment temperatures on physical and mechanical properties such as color,mass loss rate,compressive strength parallel to the grain,tensile strength,and flexural strength is investigated.Regression equations are used to fit the variation of strength with temperature.(3)Bending tests are conducted on beams with microcracks,ordinary beams at the normal production level,and beams with steel plates added at the ends.The failure modes,ultimate bearing capacity,and midspan deflection of inorganic composite bamboo beams are studied.After the tests,the beams with microcracks are repaired and vertically reinforced.The reparability of inorganic composite bamboo beams and their bending performance after vertical reinforcement are investigated.(4)Combining the material properties of inorganic composite bamboo and the experimental results of beams,the ultimate bearing capacity and deflection of inorganic composite bamboo beams are analyzed using the linear elastic model.The theoretical and calculated values are compared.