The enzyme urease drives the hydrolysis of urea leading to the release of ammonium ions and bicarbonate; in the presence of calcium, the rise in pH leads to increased calcium carbonate saturation and the subsequent precipitation of calcite. Although such alkalinizing ureolysis is widespread in nature, most studies have focussed on bacteria (i.e. indigenous communities or urease-active Sporosarc...

The application of microorganisms in the field of construction material is rapidly increasing worldwide; however, almost all studies that were investigated were bacterial sources with mineral-producing activity and not with organic substances. The difference in the efficiency of using bacteria as an organic agent is that it could improve the durability of cement material. This study aimed to as...

The concept of self-healing, whereby materials such as polymers, composites and cementitious construction materials are able to sense damage or deterioration and regulate, adapt and repair themselves automatically, is applied here to natural and anthropogenic soil structures. Damage in such structures can be difficult to detect and monitor, and will have significant consequences, but maintenanc...

Abstract In the present study, optimization of microbiologically induced calcium carbonate precipitation (MICP) to produce biosandstone regarding compressive strength is shown. For production, quartz sand was treated sequentially with ureolytic microorganism Sporosarcina pasteurii (ATCC 11859) and a reagent containing urea chloride. Response surface methodology (RSM) applied investigate influen...

After exposure to high temperatures, the mechanical properties and durability of concrete structures are significantly reduced, effective measures must be taken for reinforcement repair. High-temperature damage manifests as looseness, spalling, cracks, which suitable microbial-induced carbonate precipitation. When repairing high-temperature with precipitation (MICP), calcium source is an import...

With time, the development of micro-cracks in concrete is a frequently reported problem structures due to ingress harmful substances, leading degradation its quality and strength, which ultimately declines construction. The present work review paper based on enhancing self-healing property by inducing different bacteria alone or incorporating mineral additives. It has been seen that various reh...

As one of the main non-covalent relations in microbiological-based systems, cell surface hydrophobicity (CSH) can be observed as a relevant parameter for biodegradation capability and suggested bacterial behaviour biofilm formation during bioremediation process. On other hand, role ureolytic bacteria has subsequently led to examination this type different engineering fields. In order optimize o...