Quasi-static and impact compression properties of glubam at different relative humidity conditions

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Construction and Building Materials Pub Date : 2024-11-14 DOI:10.1016/j.conbuildmat.2024.139172

C.Q. Chen , Q.C. Zhang , C. de Kergariou , F. Scarpa , Y. Xiao

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Abstract

Glued laminated bamboo (glubam), a product of bamboo lamination, presents a distinctive combination of eco-friendliness and mechanical strength. This study delves into the quasi-static and dynamic compression behaviour of glubam, examining the influence of key factors such as moisture content and carbonization. The experiment involved one control group and two groups of different carbonized degrees, with two relative humidity controls set at 65 % and 85 %. The results of the quasi-static compression tests revealed that higher moisture content reduced the ultimate stress and modulus of compression while enhancing the ductility of thick-strip glubam. Cross bamboo alignment bolstered the compressive strengths of longitudinal thin-strip glubam and provided considerable compressive capacity for transverse thin-strip glubam. Poisson’s ratios of glubam were also determined. During drop-tower impact testing, an input energy of 209.5 J resulted in the determination of the dynamic ultimate stress of glubam. The application of reasonable image procedures, supported by high-speed camera collections, aided in the efficient presentation of absorbed energy. Scanning electron microscope (SEM) images were employed to explore experimental results through the microstructure perspective.

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不同相对湿度条件下胶蛤的准静态和冲击压缩特性

胶合层压竹材（Glubam）是竹材层压的一种产品，具有生态友好性和机械强度的独特组合。本研究深入探讨了胶合竹材的准静态和动态压缩行为，考察了水分含量和碳化程度等关键因素的影响。实验包括一组对照组和两组不同碳化程度的对照组，两组相对湿度控制在 65 % 和 85 %。准静态压缩试验的结果表明，较高的含水率降低了粗条胶砂的极限应力和压缩模量，同时增强了其延展性。横向竹节排列增强了纵向薄条胶凝材料的抗压强度，并为横向薄条胶凝材料提供了相当大的抗压能力。此外，还测定了胶凝材料的泊松比。在落塔冲击试验中，输入能量为 209.5 J，从而确定了胶凝材料的动态极限应力。在高速相机采集的支持下，合理图像程序的应用有助于有效呈现吸收的能量。扫描电子显微镜（SEM）图像被用来从微观结构的角度探索实验结果。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.