摘要
分析了高密度重组竹的孔隙率、微观结构、耐水性和力学性能,并通过构建性能参数与密度的关系,探究密度对物理力学性能的影响规律。结果表明:随着密度的增大,孔隙率逐渐降低。当密度为1.37 g/cm3时,孔隙率仅为5.52%,竹材细胞基本实现了密实化;薄壁细胞和导管细胞发生严重变形,但纤维细胞的形态几乎未受影响。经4 h水煮-20 h 60℃干燥-4 h水煮处理后,吸水率、厚度膨胀率和宽度膨胀率均随密度的增大而下降,分别低至9.67%、7.62%和1.47%。水平剪切强度、顺纹抗压强度、静曲强度(MOR)和弹性模量(MOE)则随密度的增大而增大,分别高达28.83、215.53、354.00 MPa和28.75 GPa。所有重组竹的性能参数均达到了户外用重组竹的性能要求,且部分参数远超国标中规定的最高等级要求。此研究结果可为重组竹性能的调控与应用提供理论依据和数据参考。
Bamboo scrimber with high density was studied to reveal the influence of density on the physical and mechanical properties by analyzing the porosity and microstructure,water resistance and mechanical properties and establishing the quantitative relationships between the density and as-resulted metrics.The results showed that the porosity declined with an increase in density.Bamboo cells were densified at 1.37 g/cm3 and the porosity was 5.52%.Parenchyma cells and vessel cells were severely deformed,while fibrous cells were invariable.The water absorption,thickness swelling,and width swelling decreased with the increasing density after the scrimbers were treated in boiling water for 4 hours,in an oven at 63℃for 20 hours and in boiling water for additional 4 hours,and their lowest values were 9.67%,7.62%,and 1.47%,respectively.The horizontal shear strength,parallel-to-grain compressive strength,MOR,and MOE increased with the density,and their maximum values were 28.83,215.53,354.00 MPa,and 28.75 GPa,respectively.The performance metrics of all the tested scrimbers met the outdoor bamboo scrimbers'requirements,and some far exceeded the highest level specified in national standards.The results can provide theoretical and data references for the performance regulation and application of bamboo scrimbers.
作者
许杨
刘倩
孙子健
魏金光
于文吉
XU Yang;LIU Qian;SUN Zi-jian;WEI Jin-guang;YU Wen-ji(School of Forestry and Landscape Architecture,Anhui Agricultural University,Hefei 230036,Anhui,P.R.China;Key Laboratory of State Forest and Grassland Administration on Wood Quality Improvement&High Efficient Utilization,School of Forestry and Landscape Architecture,Anhui Agricultural University,Hefei 230036,Anhui,P.R.China;Scrimber Engineering and Technology Research Center of State Forestry and Grassland Administration,Research Institute of Wood Industry,Chinese Academy of Forestry,Beijing 100091,P.R.China)
出处
《林产工业》
北大核心
2024年第6期20-26,共7页
China Forest Products Industry
基金
国家重点研发计划课题(2022YFD2200903)
安徽省自然科学基金青年项目(2208085QC91)
安徽农业大学人才科研资助项目(RC372011)。
关键词
重组竹
高密度
微观结构
耐水性
力学性能
Bamboo scrimber
High density
Microstructure
Water resistance
Mechanical properties
