ABSTRACT

Plasters are traditional surface finish materials in timber buildings. Today, the lack of fire performance data and design guidelines place such ecological materials at a disadvantage since plaster is not considered as a fire protection material for timber. This study aims to provide an up-to-date overview of performed fire tests accompanied by investigations on thermal properties of selected ready-mix clay and lime plasters. Design parameters of plasters for the fire design of timber structures are proposed following the safety philosophy of EN 1995-1-2. Numerical heat transfer simulations provide sufficient agreement with furnace test results for undercoat clay plaster. The mechanical fastening system of a plaster (e.g. reed mat) on timber demonstrates paramount importance when determining the charring rate of timber and the fall-off time of plaster. The structural integrity and fire performance of plasters should be further investigated due to their various recipes and numerous fastening systems on timber. Further research in full-scale is needed to confirm the recommended design parameters.

摘要

灰泥是木结构建筑中的传统表面处理材料。今天，由于缺乏防火性能数据和设计指南，因此这种生态材料处于不利地位，因为石膏不被视为木材的防火材料。本研究旨在提供已执行的火灾测试的最新概述，同时对选定的预拌粘土和石灰灰泥的热性能进行调查。根据 EN 1995-1-2 的安全理念，提出了用于木结构防火设计的灰泥设计参数。数值传热模拟与底涂粘土灰泥的熔炉测试结果完全一致。石膏的机械紧固系统（例如 在确定木材的炭化率和石膏的脱落时间时，木材上的芦苇垫）显示出至关重要的作用。由于石膏的各种配方和木材上的众多紧固系统，应进一步研究石膏的结构完整性和防火性能。需要进一步的全面研究来确认推荐的设计参数。