Reaction to Fire of the Timber Structure Encapsulated by Multilayer Mortar Coating Under Uniform Thermal Loading

IF 2.3 3区 工程技术 Q2 ENGINEERING, MULTIDISCIPLINARY
Wei Chu, Jun Fang, Yahong Yang, Shangqing Tao, Hassan Raza Shah, Mengwen Wang, Yu Wang
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Abstract

Encapsulation is an effective method for enhancing the reaction to fire of timber structures. Mortar coatings are widely used to encapsulate traditional timber structures due to their excellent mechanical properties. However, there is a significant lack of data on the reaction to fire and fire mechanisms of timber structures with mortar encapsulation, and little is known about the influence of mortar composition on the burning characteristics of timber substrates. This study investigated the fire properties of organic–inorganic composite multilayer mortar coatings with fibre-reinforced layers commonly employed in encapsulating traditional Chinese wooden structures. The burning phases of timber encapsulated by multilayer mortar coatings were examined using thermogravimetric analysis and constant radiation ignition experiments. The fire propagation apparatus was used to measure the critical fire parameters of the encapsulated timber structures, including ignition time, heat release rate, total heat release, and time to peak heat release rate under a constant radiation heat flux of 30 kW/m2. Comparative experiments between finished and semi-finished coating encapsulated samples were conducted to investigate the influence of coating composition. The cracking behaviour of the coating was synchronously observed, with crack length analysis using image recognition techniques. It was found that the topcoat property of the coating mainly influenced the ignition time, and adding the fibre layer can effectively inhibit the bending of the timber substrate. Additionally, reducing the aggregate size may effectively prolong the time to reach the peak of the heat release rate. The relationship between the rise in heat release rate in encapsulation coatings, the appearance of surface cracks, and the maximum crack length with the heat release rate peak has been well established.

Abstract Image

多层砂浆涂层包裹的木结构在均匀热负荷下的火灾反应
封装是增强木结构火灾反应的有效方法。砂浆涂层因其优异的机械性能而被广泛用于传统木结构的封装。然而,关于采用砂浆封装的木结构的火灾反应和火灾机理的数据却非常缺乏,而且人们对砂浆成分对木材基材燃烧特性的影响也知之甚少。本研究调查了中国传统木结构封装中常用的带有纤维增强层的有机-无机复合多层砂浆涂层的燃烧特性。通过热重分析和恒定辐射点火实验,研究了被多层砂浆涂料包裹的木材的燃烧阶段。在 30 kW/m2 的恒定辐射热通量下,使用火灾传播仪测量了封装木结构的关键火灾参数,包括点火时间、放热速率、总放热量和放热速率达到峰值的时间。为了研究涂层成分的影响,对成品和半成品涂层封装样本进行了对比实验。利用图像识别技术分析裂纹长度,同步观察涂层的开裂行为。结果发现,涂层的表层特性主要影响点火时间,而添加纤维层可有效抑制木材基材的弯曲。此外,减小骨料尺寸可有效延长达到热释放率峰值的时间。封装涂料中热释放率的上升、表面裂纹的出现以及最大裂纹长度与热释放率峰值之间的关系已经得到了很好的证实。
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来源期刊
Fire Technology
Fire Technology 工程技术-材料科学:综合
CiteScore
6.60
自引率
14.70%
发文量
137
审稿时长
7.5 months
期刊介绍: Fire Technology publishes original contributions, both theoretical and empirical, that contribute to the solution of problems in fire safety science and engineering. It is the leading journal in the field, publishing applied research dealing with the full range of actual and potential fire hazards facing humans and the environment. It covers the entire domain of fire safety science and engineering problems relevant in industrial, operational, cultural, and environmental applications, including modeling, testing, detection, suppression, human behavior, wildfires, structures, and risk analysis. The aim of Fire Technology is to push forward the frontiers of knowledge and technology by encouraging interdisciplinary communication of significant technical developments in fire protection and subjects of scientific interest to the fire protection community at large. It is published in conjunction with the National Fire Protection Association (NFPA) and the Society of Fire Protection Engineers (SFPE). The mission of NFPA is to help save lives and reduce loss with information, knowledge, and passion. The mission of SFPE is advancing the science and practice of fire protection engineering internationally.
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