The effects of biomineralization on the localised phase and microstructure evolutions of bacteria-based self-healing cementitious composites

Microbially induced calcite precipitation (MICP) is one of the most effective mechanisms to achieving self-healing abilities in cementitious composites. However, there has only been limited understanding effect MICP process on mineralogy and microstructure matrix closely mixed with healing products. This study systematically assessed biomineralization localised binders at micro atomic level combining different characterisation techniques (i.e. XRD, FTIR ?CT). The results show that, addition formation CaCO3 polymorphs that close crack space, will also modify phase assemblages near healed cracks. For first time we observed when common source calcium for (calcium hydroxide) limited, ettringite C–S–H can act as providers take place. detailed characterisations support apart from dense thin layer (around 0.5 mm) products formed surface cracks, loose particle-like carbonate crystals form pores voids, suggesting be generated deeper sections crack. outcomes this advance fundamental Portland cement binders, assist further evaluation durability performances these self-healed