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为研究孔隙率对加气混凝土中湿分迁移特性的影响,采用恒温恒湿箱控制环境相对湿度和温度的方法对具有三种不同孔隙率的加气混凝土试样的动态吸湿和放湿过程进行了测试。研究结果表明,在等温吸湿过程中,加气混凝土试样的孔隙率越大,其含水率增长速率越大且平衡含水率也越高;而在等温放湿过程中,孔隙率越大的试样含水率下降速率越快且平衡含水率也越小,达到放湿平衡所需的时间则随相对湿度的提高而增长。比较不同环境温度下的吸放湿过程可知,较低的环境温度使得试样达到平衡状态所需的时间显著增加。此外,根据等温吸湿数据给出了加气混凝土吸湿平衡含水率随相对湿度变化的分段函数拟合公式。
In order to study the influence of porosity on the moisture transfer characteristics of aerated concrete, the dynamic moisture absorption and desorption processes of aerated concrete samples with three different porosities were controlled by the method of controlling the relative humidity and temperature of the environment by a constant temperature and humidity chamber The test. The results show that in the process of isothermal hygroscopic adsorption, the larger the porosity of aerated concrete samples is, the higher the moisture content growth rate is and the higher the equilibrium moisture content is. In the process of isothermal desorption, the larger porosity The faster the rate of moisture reduction and the lower the equilibrium moisture content, the longer the time required to reach the equilibrium for moisture release increases with relative humidity. Comparing the process of absorbing and releasing moisture under different ambient temperatures, it is known that the lower ambient temperature significantly increases the time required for the sample to reach equilibrium. In addition, according to the isothermal hygroscopic data, the fitting function of the subsection function of moisture absorption equilibrium moisture content of aerated concrete with relative humidity is given.