A multi-scale network model based on the percolation theory and using a renormalization method was applied to describe the porous space of cement-based materials and to determine their gas transport properties. Gas per- meability was measured on hardened cement pastes prepared with French OPC (CEM I) and BFS-PFA (CEM V) cements currently used in the nuclear waste industry. These experiments were carried out to study the influence of the degree of water saturation and of the microstructure on materials gas transport properties. Between 10 and 100/100 relative humidity, the cement pastes' average gas permeability varies over five orders of magnitude (10~(-16-10~(-21 m~2).
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