A Precise Method of Determining the Unfrozen Water Content and the Freezing Point from DSC Data

摘要

In the paper, a method based on the DSC (differential scanning calorimetry), able to indicate the real phase changes in individual soil sample in detail is presented. The method consists in determining the real heat flux function q(T) absorbed by the frozen soil sample during the warming DSC run. It is based on searching for a distribution of "heat impulses" in relation to temperature, which convoluted with the apparatus function a(T) gives a minimal deviation from the observed heat flux function h(T). The function q(T) can be easily related to the function of unfrozen water content wu(T). The latter determines such important parameters of the soil freezing process as the melting point Tf and the content of the unfreezable water wun.