FIELD: physics, measurement equipment.
SUBSTANCE: invention relates to measurement equipment and can be used to examine mass transfer processes in capillary porous materials for solvent diffusion coefficient determination in building materials and structures, as well as in food, chemical and other industries. The solvent diffusion coefficient determining method in capillary porous material massive items consists in creating, in the tested specimen, of uniform initial content of substances distributed in the solid phase, bringing the specimen flat surface in contact with the solvent dose pulse point source, waterproofing of this surface and determination of time to achieve maximum in the curve of EMF variation of the galvanic converter with electrodes arranged on the surface in a concentric circle relative to the solvent impact point and calculation of the desired diffusion coefficient. Note here that in addition, the specimen is handled in the solvent saturated steam atmosphere at the specified control temperature, and the solvent equilibrium concentration in the tested specimen solid phase is determined. Then the specimen is dried, and the tested specimen density in dry condition is determined. Then the speciman is exposed to pulse by a solvent dose from the range calculated using the formula: 
, where ρ0 is the tested specimen density in the dry state, Us is the tested specimen solvent equilibrium concentration when contacting with the solvent saturated steam at the specified temperature,r0 is the distance between the electrodes and the point of solvent dose impact on the monitored item.
EFFECT: invention provides for improved monitoring accuracy and reduction of time consumption and costs for studies.
2 cl, 1 dwg
