Abstract
A system of coupled transient differential equations governing heat, mass transfer, and pore pressure built up in porous media (concrete), subjected to intensive heating, is derived. Water vapor and liquid water are considered separately in the mass transfer formulation. The primary unknowns are temperature, water vapor content, and pore pressure of the gaseous mixture. A finite element formulation and corresponding flowchart of computations of all required data are presented. The numerical example solved represents a cross section of a concrete column exposed to fire. The domain and time distributions of temperature, pore pressure, water vapor, and liquid water content are presented. Computed pore pressure is higher than those usually reported by other analytical studies. The influence of some initial parameters (permeability, initial water content, and porosity) on maximum pore pressure is investigated.
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