The effect of temperature on water vapour desorption isotherms can be described simply using the Clausius-Clapeyron equation and the isosteric energy of adsorption, the latter conventionally estimated using two (or more) isotherms obtained at different temperatures. This approach has some disadvantages, however, and this article puts forward a simple alternative methodology for characterising this isosteric energy experimentally. Our method is based on monitoring the relative humidity of a cementitious material heated under sealed conditions. The evolution of the relative humidity as a function of temperature makes it possible to directly evaluate the isosteric energy. In practice, the tests are performed using a cell of the type that is used for self-desiccation studies.

温度对水蒸气解吸等温线的影响可以简单地使用克劳修斯-克拉佩龙方程和等量吸附能来描述，后者通常使用在不同温度下获得的两个（或更多）等温线来估计。然而，这种方法有一些缺点，本文提出了一种简单的替代方法，用于通过实验表征这种等量能量。我们的方法基于监测在密封条件下加热的胶结材料的相对湿度。作为温度函数的相对湿度的演变使得直接评估等量能量成为可能。在实践中，测试是使用用于自干燥研究的细胞类型进行的。