performance of bio concrete by using bacillus pasteurii bacteria

performance of bio concrete by using bacillus pasteurii bacteria

in concrete, cracking is a common phenomenon due to its relatively low tensile strength , which occurs due to external loads and imposed deformations . the main research objective is to create a kind of self-healing concrete by employing mineral producing bacteria bacillus pasteurii to locate the rift in the most favourable circumstances for autogenous healing to take place. self-healing concrete containing bacteria has been generated for this study through the application of bacterial self-healing elements as spores and nutrients with different percentages of bacteria ranging from (10% - 25%) as a replacement of mixing water is added at the time of pouring.

the bacteria influence was observed by scanning electron microscope (sem) and with energy dispersive x-ray spectrometer. the mechanical properties and durability of a thirty-five mixture were examined. the optimal blending content proportion was 10sf20bc, which showed an increment in compressive strength and flexural strength compared to the control mixture to reach 79.16%, 50% respectively and 24.38% enhancement in sulfate resistance. the highest percentage of calcium carbonate precipitations was 9.49% of a weight of mixtures elements, which, in turn, revealed the highest area repair rate , ihw h ihw able to fill the crack with widths leads to 0.80 mm.