珊瑚砂混凝土热湿物性参数研究

Study of Hygrothermal Characteristics of Coral Sand Concrete

利用微粒学水银孔隙度仪,分析了珊瑚砂混凝土(CSC)的孔隙率及孔径分布,研究了热湿对CSC导热系数的影响,得到了CSC的导热系数随相对湿度变化的函数关系式、CSC的吸水系数及等温吸湿曲线.结果表明:CSC总孔隙率为28.76%,孔径为30~40nm的孔体积增速最快;在-20~50℃下,温度对CSC干燥状态的导热系数影响较小,最大变化率仅为0.55%;在25、35℃,相对湿度0%~100%下,CSC导热系数随相对湿度的变化过程可分为平稳上升、趋于平缓和迅速增加3个阶段,与其等温吸湿过程相符合;当相对湿度从0%增至100%时,CSC在25、35℃下的导热系数分别增长29.5%、49.0%.

The porosity and pore size distribution of coral sand concretel(CSC)were analyzed by a microparticle mercury porosimeter.The influence of temperature and relative humidity on the thermal conductivity of CSC was studied.The functional relationship between the thermal conductivity of CSC and the relative humidity,the water absorption coefficient and the moisture sorption isotherms of CSC were obtained.The results show that the porosity volume fraction of CSC is 28.76%,and the maximum growth rate of pore volume is 3040nm.The temperature has little effect on the thermal conductivity of CSC in the dry state at-2050℃,the maximum change rate is only 0.55%.At 25 and 35℃with the relative humidity of 0%100%,the change process of the thermal conductivity of CSC can be divided into the steady rising stage,the gentle increasing stage and the rapid increasing stage.When the relative humidity changes from 0%to 100%,the thermal conductivity of CSC increases by approximately 29.5%and 49.0%at 25 and 35℃,respectively.