Boundary conditions for the problem of moisture transport in concrete

When calculating of the moisture transport in concrete such geotechnical structures as a pile or diaphragm wall, contact with soil is forming special boundary conditions. If full saturated state, then Darcy’s law should be used to solve problem, condition for which water pressure. Otherwise, Bažant- Najjar model used, relative humidity environment at certain temperature. The temperature unique characteristic each construction area. For Moscow region, weighted arithmetic mean depth 60 m 7.3°C. It proposed calculate according Kelvin capillary condensation equation, suction calculated using Mualem-van Genuchten hydraulic from degree saturation. Two well- known sets parameters model, compiled on HYPRES and HYDRUS-1D database European map texture classes USDA textural classification respectively, were compared measurement results samples classified Russian GOST 25100. experimental data showed good approximation calculation set obtained basis database. At same time, solution parameter poor correlation.