Performance of Bio Concrete by Using Bacillus Pasteurii Bacteria
Gehad A. M. Metwally, Mohamed Mahdy, Ahmed El-Raheem H. Abd El-Raheem
Abstract
In concrete, cracking is a common phenomenon due to its relatively low tensile strength"Ž "Ž, which occurs due to external loads and imposed deformations"Ž"Ž. The main research objective is to create a kind of self-healing concrete by employing mineral producing bacteria Bacillus pasteurii"Ž 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 "Žspores "Žand 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 "ŽDispersive X-ray Spectrometer. The mechanical properties and durability of a thirty-five mixture were "Žexamined. The optimal blending content proportion was "Ž10SF20BC, which showed an increment in compressive strength and flexural strength compared to the control mixture "Žto "Žreach 79.16%, 50% respectively and 24.38% enhancement in sulfate resistance. The highest percentage of calcium carbonate precipitations was "Ž9.49% of a weight of "Žmixtures "Želements, which, in turn, revealed the highest area repair rate, which was able to fill the "Žcrack with widths leads to 0.80 mm.