CRACK REPAIR IN CONCRETE USING CHEMICAL PROCESSES AND BACTERIA

Abstract

The article describes technological processes of concrete self-restoration with the help of basic bio-additives: calcium concentration, concentration of soluble inorganic carbon, pH value, presence of crystallization center. In transportation construction, there are many building structures in harsh operating conditions that require strengthening or restoration of their physical and mechanical properties for stability, reliability and safety. A number of bacteria, which can be found in soil, sand and natural minerals, have the ability to release calcium carbonate, both in natural and laboratory conditions, are capable of restoring these properties. The laboratory method of self-remediation of concrete used in the construction of transportation structures is considered. Calcium lactate (CaC6H10O6) was used as a starting substance for calcium carbonate formation. In addition, urea required by the bacteria as a source of urease enzyme and yeast extract as a source of carbon and nitrogen were added. This study showed that this simplified representation of the processes occurring during carbonate deposition induced by biomicrobes has a positive effect on the physical and mechanical properties affecting the safety, reliability and sustainability of transportation infrastructure building structures.