【摘要】 导热系数是建筑材料最重要的热湿物性参数之一,温度和含湿量均能够对其产生影响。当温度和含湿量中的一个因素被确定后,一元线性函数通常被用来描述另一个因素对导热系数的影响。然而,实际情况下二者对导热系数的影响是同时存在的。采用防护热板法对聚苯乙烯泡沫(EPS)、岩棉、混凝土、胶粘剂和抹面胶等5种典型建筑材料在不同温度和含湿量下的导热系数进行测试。结果表明,对上述材料而言,二元线性函数可以用来描述温度和含湿量对导热系数的影响,且温度和含湿量之间的交互作用可以被忽略。对于EPS和岩棉等弱吸湿弱毛细材料而言,可以将二元线性函数简化为仅与温度相关的一元线性函数。更多还原

【Abstract】 Thermal conductivity is one of the most important hygrothermal properties of building materials which depends on temperature and moisture content.The one-variable linear function is usually used to describe the influence of either temperature or moisture content on the thermal conductivity when the other one is fixed.However,for real situations temperature and moisture content have simultaneous influence.The thermal conductivities of five typical building materials-expanded polystyrene(EPS),mineral wool,concrete,adhesive mortar and rendering plaster-were measured with the guarded-hot-plate apparatus at different temperature and moisture content.Results show that the two-variable linear function is sufficient to describe the coupled influence of temperature and moisture content on all studied materials.The interaction between temperature and moisture content is negligible.For weakly hygroscopic and capillary materials such as EPS and mineral wool,the two-variable linear function can be simplified to the one-variable linear function of temperature.更多还原