Research on Pore Structure of Foam Gypsum Modified by Portland–Sulphoaluminate Composite Cement (PSACC)

Abstract

The pore structure of the modified foam gypsum and its thermal insulation performance were revealed through the integrated study of microscopic, macroscopic, and simulation. Scanning electron microscope (SEM) was used to observe the process of coexistence of crystal and colloid embedded in the modified foam gypsum, and the relationship between the pore structure and macroscopic properties of the foam gypsum was investigated by combining with the principle of somatology, and finally, under the consideration of hierarchical aperture, the thermal conductivity of the porous material was effectively predicted by using the random distribution model of MATLAB and the finite element software of COMSOL in the joint simulation. The results showed that the symbiosis patterns between the hydration products of foam gypsum at different hydration stages were different, and the final pattern showed that the reticular C-S-H gel was attached to the surface of whisker-like gypsum crystals. In the process of porosity filling of foam gypsum, three types of pore size small set phenomenon were exhibited, and the gypsum with small and uniformly distributed pore size had excellent thermal performance; MATLAB random distribution model and COMSOL finite element software joint simulation could effectively predict the thermal performance of porous materials.