FIELD: measuring technology.
SUBSTANCE: invention relates to measuring technology and can be used in the study of mass transfer processes in capillary-porous materials to determine the diffusion coefficient of solvents in building materials and structures. The method for determining the diffusion coefficient in massive products made of orthotropic capillary-porous materials consists in creating a uniform initial content of the solvent distributed in the solid phase in the test sample, waterproofing the upper flat surface of the sample, at the initial moment of time, pulsed linear wetting of the upper surface of the test product in given direction of the orthotropic material along a straight line by a moving solvent source of constant productivity, the electrodes of the galvanic converter are made in the form of straight segments and placed on both sides of the pulsed humidification line on straight lines parallel to the pulsed humidification line and at the same predetermined distance from it, fix the moment of reaching the specified values of the signal of the galvanic sensor and calculate the diffusion coefficient, while measuring the change in time of the signal of the additional galvanic sensor, rectilinear electric whose rods are located on both sides of the pulsed humidification line on straight lines parallel to the pulsed humidification line and at a different distance from it, the time points τ1 and τ2 are fixed at which the same values of the signals of the first sensor E1 and the second sensor E2 from the range (0.7 –0.9) Ee on the descending branches of the curves of changes in signals over time of these two.
EFFECT: improving the accuracy of measuring the diffusion coefficient of solvents in massive products made of orthotropic capillary-porous materials.
1 cl, 1 dwg
