As indicates a. IN. Lykov, the moisture content of colloidal and capillary porous bodies can reach the value of hygroscopic if the relative humidity of the air surrounding these bodies f = 1.
The humidity of the hydrophobic ash in the cold state could become equal to hygroscopic, since the soil surrounding the isolation contained gravitational water, in which the pressure of the water vapor in the pore space corresponded to the pressure of steam above the free surface of the water (steam saturated at this temperature).
According to research research institute-200, the maximum hygroscopic humidity for hydrophobic ash at air temperatures of 25 ° and relative humidity of its 98% was 3.5% (by weight).
If we take into account that the increase in the humidity of the hydrophobic ash by 1 % (in volume) causes an appropriate increase in the heat conductivity coefficient by 7-7.5 %, it will become clear that even the smallest change in the moist insulation regime is reflected in thermal losses.
If the initial moisture content of the ash was uniform in height of the layer, then on the 24th and 62nd day the humidity decreased in the center, t. e. near the heat source (1.2%) and increased in the coldest outer layers, especially in the outer contour (12-16%).
In addition to the reasons stated above, the lower contour layer increases the moisture content of the lower contouring. the impact of the periodic rise in the stand on the stand and, as a result, the effect of hydrostatic pressure.
The insignificant value of the pressure and the short duration of its action did not cause moisturizing the subsequent layers of isolation even with significant temperature jumps. This can be explained that the moisture distribution curves in height in the lower zone are represented by straight lines, almost parallel to the abscissa axis.
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