摘要
格鲁斑胶合竹(Glu Bam)是一种新型竹质工程材料,在使用环境中的耐久性对竹结构建筑的安全性有重要影响,但目前这方面的研究还处于空白。为此提出了一种适用于Glu Bam材料耐候性研究的人工气候加速老化试验方法及设备,并对Glu Bam经历不同等效老化时间后的变形和基本力学性能进行试验和分析。研究结果表明:干湿循环导致Glu Bam老化后厚度显著增大,产生不同程度的分层开裂,是其基本力学性能降低的主要原因。所有的力学指标都随老化时间的增加而单调下降,且内结合强度对老化时间最为敏感。基于老化影响因子β、内结合强度相关系数η和厚度变化相关系数θ,提出了一种基于厚度测试的Glu Bam老化后的力学性能评估方法,但这种方法的准确性还需要进行大量试验。对于直接暴露于干湿循环环境中的Glu Bam,需要采取必要的防护措施,这方面需要进行专门研究。
GluBam is a new kind of environmentally friendly and energy efficient composite material in civil engineering developed in recent years.But the mechanical performance after subjected aging under the outdoor conditions is a blank of research.In this paper, a new artificial accelerated aging test method and equipment for GluBam were presented .The basic material performance, including deformation changing, tensile properties, compressive properties, bending properties and internal bonding strength were tested according to the different equivalent aging duration.The failure mode of specimens showed that delamination of GluBam caused by dry-wet cycle was the main reason for mechanical properties degradation.All test results present monotone decreasing trend and the internal bonding strength was the most sensitive to aging duration.Aging influence factorβ, internal bonding strength correlation coefficient ηand thickness deformation correlation coefficient θ can be used to evaluate aging performance of GluBam, but the accuracy of evaluation results need further research.GluBam exposed to the dry wet cycle condition needs necessary waterproof measures ,which should be specially investigated further.
出处
《工业建筑》
CSCD
北大核心
2015年第4期26-32,共7页
Industrial Construction
基金
国家自然科学基金重点项目(50938002)
中央高校基本科研业务费项目联合资助
关键词
人工老化
耐久性
胶合竹
力学性能
artificial aging
durability
GluBam
mechanical properties
