结构用阻燃单板层积材的设计制造及性能评价

Design,Manufacture and Evaluation of Flame-retardant Structural Laminated Veneer Lumber

为探究国产速生材制造建筑结构用LVL的可行性,选取了2种常用的阻燃剂APP和BX对国产速生杨木单板进行阻燃处理,并对LVL的结构进行设计,提出合理的工艺参数,之后对制备的LVL进行物理力学性能和阻燃性能的测试。结果表明:与对照组相比,经阻燃处理的LVL浸渍剥离率增加,但在标准规定的范围之内,2种阻燃剂处理的LVL力学性能下降不明显,均能满足结构用单板层积材的强度要求。同时,2种阻燃剂处理的LVL的阻燃性能明显上升,但APP的效果更好。经APP处理的试件,其氧指数超过32%,达到了B1级难燃材料的标准。研究结果有助于推动速生材在结构领域的应用,具有良好的经济与社会效益。

To investigate the possibility of fast-growing timber to manufacture structural LVL,in this paper,two commonly used flame retardants APP and BX were selected to carry out flame retardant treatment on fast-growing poplar veneer.The structure of LVL was designed and proper manufacturing parameters were proposed.After that,the physical-mechanical properties and flame retardancy of LVL were tested.The results showed that,in terms of physical and mechanical properties,the impregnation peeling rate of the flame retardant LVL increased compared with that of the control group,but it was within the range of the standard,and the decrease in the mechanical properties of the LVL treated with the two kinds of flame retardant was not obvious,and both of them could reach the strength requirements of veneer laminates for structural use.The flame retardancy of two kinds of LVL increased significantly,but the effect of APP was better,and the specimen treated with APP had an oxygen index of more than 32%,which reached the standard of B1 grade.The results of the study will promote the application of fast-growing materials in the structural field,which has good economic and social benefits.