极端热湿地区新型低能耗环保建筑材料老化试验研究

Experimental Study on the Aging of New Building Materials with Low Energy Consumption and Environmental Protection in Extreme Hot and Humid Areas

由于极端热湿地区气候会影响新型低能耗环保建筑材料热湿性能,为此,以挤塑聚苯乙烯泡沫板(XPS)为试验用新型低能耗环保建筑材料,通过热湿老化试验研究极端热湿条件对其吸湿特性、拉伸性能、压缩性能、阻燃元素含量和极限氧指数、动力学性能以及燃烧性能的影响。试验结果表明,水在样品中的扩散系数为1.66×10-6mm2/s;随着热湿老化时间的增加,样品抗拉强度、平压强度和压缩模量、测压强度均呈下降趋势,其中测压强度的下降幅度较小,约为热湿老化前样品的84.21%;热湿老化会导致样品中阻燃剂溴元素流失、极限氧指数下降,温度越高,溴元素流失越快、极限氧指数下降幅度越大;高温条件会显著降低样品的玻璃化转变温度和储能模量,热湿老化溶液介质对玻璃化转变温度和储能模量的影响不显著;热湿老化可降低样品燃烧性能,且热湿老化温度越高,样品燃烧性能降低越快。

As the climate in extreme hot and humid regions will aff ect the thermal and humidity properties of new low energy consumption and environmental protection building materials,a new type of low energy consumption and environmentally friendly building materials with extruded polystyrene foam(XPS)as the experimental material was studied.The moisture absorption characteristics,tensile properties,compressive properties,flame retardant elements content,limiting oxygen index,dynamic performance and combustion peformance under extreme heat and humidity conditions were studied through thermal and humid aging tests.The results show that the diff usion coefficient of water in the samples is 1.66×10-6mm2/s;with the increase of the time of heat and humidity aging,the tensile strength,compressive modulus and compressive strength of the samples show a downward trend,among which the compressive strength decreases slightly,which is about 84.21%of the samples before the heat and humidity aging;the heat and humidity aging will lead to the loss of bromine in the flame retardant and the limit oxygen index.The higher the temperature,the faster the loss of bromine and the greater the decrease of limiting oxygen index.High temperature can significantly reduce the glass transition temperature and the storage modulus of the sample,and the influence of the hot and wet aging solution medium on the glass transition temperature and the storage modulus is not significant;the hot and wet aging can reduce the combustion performance of the sample,and the higher the hot and wet aging temperature is,the faster the combustion performance of the sample decreases.