Study On Material Composition And Poperities Of Bamboo Composite Anti-glare Board

With the rapid increase of global consumption of non-renewable resources,non-renewable resources have become scarce,and the issue of resources has become the focus of common concern around the world.Using bamboo resources to prepare bamboo composite materials has become an effective means to alleviate the shortage of resources and environmental pollution.In this paper,high density polyethylene(HDPE)was used as matrix and bamboo powder as reinforcement to prepare toughened bamboo composites by warm compaction process.The mechanical properties,microstructure and thermal stability of bamboo composite were studied.The temperature and humidity stress of bamboo composite anti-glare board were analyzed by ABAQUS.The main content and research results are as follows:(1)The setting requirements of high-grade highway anti-glare facilities were analyzed.The results showed that the shading angle anti-glare facilities in straight section should be 8.0 °,and that in horizontal vertical curve section should be 8 °～15 °.The height of anti-glare board in straight line section was mainly determined bythe value of B1/B and B2/B(B stands for the transeverse distance when two vehiclesmeet;B1 and B2 stands for the diatance between two vehicles and the center line of anti-glare board in road central separator belt).(2)Based on the orthogonal test,the static bending strength,apparent hardness and internal bonding strength of the warm compacted specimens were taken as evaluation indexes to optimize the warm compaction process parameters of the bamboo composites.The optimum process conditions for the warm compaction of the bamboo composites were determined as follows:the number of bamboo powder was 40 meshes,the forming temperature was 160 ℃,the forming pressure was 80 MPa,and the holding time was 30 minutes.(3)Based on laboratory tests,the effects of bamboo powder mesh number on mechanical properties of bamboo composite specimens were studied.The changing trends of tensile strength and bending strength of the bamboo composites under different aging time at high temperature were defined,and the attenuation laws of the properties were established.The results showed that the tensile strength,bending strength,bending modulus and impact strength of bamboo composite increased firstly and then decreased with the increase of bamboo powder content in the range of 20-120 mesh.The optimum particle size of bamboo powder was determined as 40 meshes.The results of high temperature aging showed that the tensile strength and bending strength of the specimens increase first and then decrease with the increase of aging time.(4)The micro-structure of bamboo composites was fully plasticized,and the interfacial bonding force and compatibility between reinforcement(bamboo powder)and matrix(HDPE)were good.The tensile failure of bamboo composites belongs to ductile failure.The results of thermogravimetric analysis and differential scanning calorimetry(DSC)showed that the thermal stability of bamboo composites was improved compared with bamboo powder,and the decomposition rate of bamboo fiber was delayed to some extent by adding HDPE.(5)The temperature and humidity stress of bamboo composite anti-glare board were analysed by finite element software.The results showed that the temperature and humidity stress of bamboo composite anti-glare board were significantly different,the stress caused by the change of humidity was more obvious,and the stress caused by the change of temperature was lower.The application of bamboo composite materials in anti-glare facilities of road engineering can increase the added value of bamboo products and expand the use of bamboo products,thus providing a new application direction for industrialized utilization of bamboo products with high added value.