Based on random algorithm and measured pore structure data,representative volume element models of ce-ment-based porous materials with different pore shapes and orientations were developed.By combining voxel grids and pe-riodic boundary conditions,the influence of pore shape and orientation on the thermal insulation performance of porous materials was studied.The results show that the more deviated the shape of the pores in cement-based porous materials from spherical,the smaller the thermal conductivity of the material,when the aspect ratio of pores is 0.5,the thermal con-ductivity decreases by 0.015 W/(m·K).When the polar axes of all elliptical pores with an aspect ratio of 0.5 are aligned along the same direction,the thermal conductivity along the pore major axis direction decreases by 22.1％.
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