Wei Chu, Jun Fang, Yahong Yang, Shangqing Tao, Hassan Raza Shah, Mengwen Wang, Yu Wang
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引用次数: 0
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.
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.