Clay and lime plaster are traditional surface finish materials used on historic timber walls and ceilings. Today, hardly any fire technical properties or design parameters exist that consider such plasters as fire protection materials for timber structures. This hinders the fire assessment of existing building structures and disadvantages their use in modern design solutions where healthy and sustainable materials are increasingly favoured. This research follows the safety philosophy of EN 1995‐1‐2 to describe the fire protection ability of plasters. This paper investigates the temperature‐dependent thermal properties of historic plasters by presenting series of material‐specific tests and furnace tests carried out under standard fire exposure conditions. Experimental studies are supported by numerical heat transfer simulations. Results demonstrate particularities between the fire protection ability of clay and lime plaster, however, highlight the need for further investigations in terms of their thermophysical performance and standardisation at the European level. Design parameters are presented and discussed in future perspective. This work demonstrates a basic research to plan and design full‐scale fire tests according to EN 13381‐7:2019.

中文翻译：

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用于结构防火设计的粘土和石灰石膏的材料特性

粘土和石灰石膏是历史悠久的木墙和天花板上使用的传统表面处理材料。如今，几乎没有任何消防技术特性或设计参数考虑将灰泥作为木材结构的防火材料。这阻碍了对现有建筑结构的防火评估，并且不利于将其用于越来越需要健康和可持续材料的现代设计解决方案中。这项研究遵循EN 1995-1-2的安全理念来描述灰泥的防火能力。本文通过介绍一系列在标准火源条件下进行的材料特定测试和熔炉测试，研究了历史悠久的灰泥的温度相关的热性能。实验研究得到了数值传热模拟的支持。结果证明了粘土和石灰石膏的防火能力之间的特殊性，然而，突出表明需要进一步研究其热物理性能和欧洲一级的标准化。设计参数将在以后的观点中进行介绍和讨论。这项工作展示了根据EN 13381-7：2019规划和设计全面火灾测试的基础研究。