Abstract
This study aims to explore the feasibility of foamed cement preparation by microbial liquid. Specimens containing glass beads were employed for comparison with microbial foamed cement, and the characterization and evaluation of these samples were conducted using techniques such as TGA, XRD, micro-CT, thermal conductivity measuring instrument and SEM. The results revealed that the porosity of the microbial foamed specimens could reach 25.3 %, and compared to the thermal conductivity of 1.06 W/mK for the normal samples, microbial foamed cement could reach 0.58 W/mK. Furthermore, the strength of the foamed cement with bacterial solution was the lowest, and the strength at 7 days was almost the same as that at 28 days. This is attributed to the high concentration of the bacterial solution impacting the stabilization of the C-S-H gel, thereby hindering the further hydration of cement particles. Nevertheless, for production blocks used in non-load-bearing structures, the strength proved to be adequate, and significant time savings can be achieved.
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