Abstract
Problems in measurements of surface area and pore size distribution are discribed. On the specific surface area, BET method and Blaine's method are comqared. On the measurement of pore size disstribution, differences among BJH method, Cranston-Inkley method and Model-less method, and comparison between gas adsorption method and mercury intrusion porosimetry are discussed. Pore structure of hardened cement pastes is mentioned, as an example, concerning with their properties.