Application of BET, BJH, and DFT methods for determining specific surface area and pore size distribution of cementitious materials

Abstract

This article summarizes and introduces the principle of the adsorption-desorption experimental method (BET/BJH) using nitrogen gas to determine the specific surface and pore size distribution of porous materials such as concrete. cardboard. Gas physical adsorption is an experimental technique based on the balanced Van der Waals interaction between gas molecules and solid particles, thereby helping to determine the specific surface area (SSA), size distribution pore size (PSD) and pore volume of solids. The adsorption-desorption experimental method using Brunauer-Emmett-Teller (BET) theory is a popular method to determine surface area, based on the principle of applying the single molecule adsorption model. Langmuir layer to other layers (multilayer). This is a popular, highly reliable method and is used to determine the pore size distribution of porous materials such as concrete. Thereby evaluating the influence of pore distribution on other physical and mechanical properties of concrete.