Bioactive Additives for Self-Healing of Concretete Microstructure
As a result of the influence of the corrosive environment, the construction materials have a decrease in performance. To increase the service life of the structures, continuous monitoring and, if necessary, restorative repairs are carried out. One of the ways to maintain the initial properties for materials is to give them a self-healing effect by introducing a specially developed additive containing a bioactive component in the manufacturing process. The article presents the results of research on the ability of building materials based on mineral binders to self-repair. Mixtures containing nutrient medium for the biomass of aerobic bacteria were used as bioadditives. Portland cement and gypsum binder were used as mineral binders. The obtained results allow to make a conclusion about a significant change in the rheological properties of cement-sand mortars due to the presence of biological surface-active substances that are part of the cells of microorganisms. The effect of changing the concentration of cells on the setting time and on the strength characteristics of cement-sand mortars was established.
Dr. Denis Solovev
M. Bruyako and L. Grigoryeva, "Bioactive Additives for Self-Healing of Concretete Microstructure", Materials Science Forum, Vol. 945, pp. 36-41, 2019