Characterization Methods for the Effect of Microbial Mineralization on the Microstructure of Hardened C3S Paste

Abstract EN

Microbial mineralization has a significant effect on the hydration process of cement-based materials.

This paper mainly studied the characterization methods for hydration degree and hydration product of C3S in hardened paste under microbial mineralization.

Quantitative X-ray diffraction (QXRD), thermogravimetric analysis (TG), Fourier transform infrared spectroscopy (FT-IR), and electron backscatter diffraction (EBSD) were used and compared.

The results showed that microbial mineralization increased the hydration degree of T-C3S.

QXRD and EBSD could be used to characterize the content of C3S, and there were few differences between the two methods.

TG could accurately characterize the content of Ca(OH)2 and CaCO3 at different depths of the sample, and FT-IR could qualitatively characterize the presence of Ca(OH)2 and CaCO3.