(1 扬州工业职业技术学院建筑工程学院, 扬州 225127; 2 扬州大学建筑科学与工程学院, 扬州 225009)

摘要: 以经防火涂料处理前后的重组竹为研究对象,测试重组竹在不同受火时间后的抗压强度、抗剪强度、抗弯强度及残余质量. 以木材为比较对象,采用差示扫描量热(DSC)和热重-微分热重(TG-DTG)方法分析重组竹、防火涂料及云杉-松木-冷杉(SPF)的热流量和质量随温度的变化过程. 结果表明:相比于未经防火涂料处理的重组竹,经防火涂料处理后的重组竹力学性能和质量随受火时间的延长下降速率均明显减小;重组竹的热稳定性优于SPF;防火涂料在高温下吸热膨胀形成碳质泡沫,具有较好的热稳定性,可以起到很好的防火作用.

关键词: 重组竹; 受火试验; 物理力学性能; 防火处理; 热分析

中图分类号:TU366. 3 文献标志码:A 文章编号:1002-848X(2023)10-0026-05

DOI:10. 19701 / j. jzjg. 20221182

Study on property degradation of bamboo scrimber for structure after exposed to fire

HU Mengjie1, YANG Dingyi2, YU Junbao1,2

(1 College of Architectural Engineering, Yangzhou Polytechnic Institute, Yangzhou 225127, China;2 College of Civil Science and Engineering, Yangzhou University, Yangzhou 225009, China)

Abstract: Taking the bamboo scrimber before and after being treated with fireproof coating the compressive strength, shearstrength, flexural strength and residual mass of the bamboo scrimber were tested. Taking wood as the comparison object,differential scanning calorimetry ( DSC) and thermogravimetric differential thermogravimetric ( TG-DTG) methods wereused to analyze the variation of heat flux and mass of bamboo scrimber, fireproof coating and spruce-pine-fir ( SPF) withtemperature. The results show that decreasing rate of the mechanical properties and mass of the bamboo scrimber treatedwith fireproof coating decreases significantly with the extension of fire time, compared with those treated without fireproofcoating. Thermal stability of bamboo scrimber is better than that of SPF. Fireproof coating in high temperature endothermicexpansion to form carbon foam, with better thermal stability, can play a very good role in fire prevention.

Keywords:bamboo scrimber; fire test; physical and mechanical property; fire prevention treatment; thermal analysis

∗国家重点研发计划(2018YFD1101002),江苏省高等学校自然科学研究面上项目(20KJB560010),江苏省住房和城乡建设厅科技项目(2020ZD40),扬州市科技计划项目(YZ2021166),扬州工业职业技术学院校级课题(2021xjzk012).

[引用本文] 呼梦洁,杨鼎宜,俞君宝. 结构用重组竹受火后性能退化研究[ J]. 建筑结构,2023,53(10):26-30.HU Mengjie,YANG Dingyi,YU Junbao. Study on property degradation of bamboo scrimber for structure after exposed to fire[J]. Building Structure,2023,53(10):26-30.

第一作者:呼梦洁,硕士,讲师,主要从事土木工程材料研究工作,Email:463824581@ qq. com.