Oriented strand board is a widely used construction material responsible for a substantial portion of the fire load of many buildings. To accurately model the response of oriented strand board to fire, thermogravimetric analysis, differential scanning calorimetry, and microscale combustion calorimetry tests were carried out to construct a thermal decomposition model using a numerical solver, ThermaKin, and a hill climbing optimization algorithm. The model included a single-step water vaporization reaction and four consecutive reactions representing thermal decomposition of organic constituents of oriented strand board. The experiments and modeling revealed that the first two of the four reactions are endothermic, while the last two are exothermic. The net heat of decomposition was found to be near zero. The heat capacities of condensed-phase species and heats of combustion of evolved gases were also determined. The heats of combustion were found to vary over the course of decomposition—the trend captured by the model. Development of a complete pyrolysis model for this material will be a subject of Part II of this work.

定向刨花板是一种广泛使用的建筑材料，可引起许多建筑物的很大一部分火荷载。为了精确地模拟定向刨花板对火的响应，进行了热重分析，差示扫描量热法和微尺度燃烧量热法测试，以使用数值求解器ThermaKin和爬山优化算法构建热分解模型。该模型包括一个单步水汽化反应和四个连续反应，分别代表定向刨花板的有机成分的热分解。实验和建模表明，四个反应中的前两个是吸热的，而后两个是放热的。发现分解的净热接近零。还确定了冷凝相物质的热容量和逸出气体的燃烧热。发现燃烧热在分解过程中变化-模型捕获的趋势。为此材料开发一个完整的热解模型将是本工作第二部分的主题。