Abstract
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.
Highlights
In recent years, microbial mineralization in cement-based materials has become a research focus
Peiming et al [5] compared the advantages and disadvantages of hydration heat method, chemically combined water method, Ca(OH)2 quantitative test method, and BSE method; the results showed that the BSE method had a better promising application for the characterization of hydration degree
Alexander [7] compared the XRD and BSE methods to characterize the phase composition of the hardened paste, and the results showed that the two characterization methods were highly consistent
Summary
Microbial mineralization in cement-based materials has become a research focus. Microbial-induced calcium carbonate precipitation (MICCP) [1, 2] is a typical biomineralization process which could be used to heal cracks in concrete and enhance the durability of cement-based materials [3]. New microbial cement-based materials have been developed [4]. The effect of microbial mineralization on cement-based materials was caused by the effect on hydration process. Erefore, it was necessary to study the hydration and its characterization methods. Many traditional methods for characterizing the hydration process of cement-based materials, such as heat evolution method, quantitative XRD (QXRD), differential thermal analysis (TGA), BSE, and so on, were used frequently.
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