基于锥形量热的建筑材料耐火性能研究

Fire-resistance properties of building structures using cone calorimeter

利用锥形量热仪对建筑材料的耐火性能进行评价研究。纤维板5组平行实验耐火时间的相对标准偏差RSD为1.5%,表明测试数据具有较高的精密度,试验方法稳定可靠;瓷砖、胶合板、杨木、泡桐木、松木、钢板、石膏板的耐火时间分别为147、216、262、278、289、312、566 s,不同材料耐火性能与材料结构、化学组成、密度等相关;木质材料在热辐射下的背火面温度变化曲线分为4个阶段,与热释放曲线相对应;杨木板和水泥板耐火时间与其厚度呈现线性关系,其相关系数分别为0.99和0.98;阻燃溶液浸渍或者表层涂覆阻燃涂料均可显著延长耐火时间。

The fire-resistance properties of building structures were studied using cone calorimeter.The 5 groups of parallel determination of fiberboards showed the RSD of fire-resistant time is only 1.5%,the high precision of data indicated the stable and reliable test method.The fire-resistant time of ceramic tile,plywood,cypress,paulownia wood,pine,steel plates and plasterboard was 147,216,262,278,289,312 and 566 s respectively,the material structures,chemical composition,density may cause the difference.The temperature change curves of wood had four stages which corresponding to the heat release curve of CONE.There was significant linear correlation between the fire-resistant time and thickness of wood or cement board,the correlation coefficient was 0.99 and 0.98 respectively.Impregnating or surface coating flame retardant materials may effectively extend the fire-resistant time.