Improving the biostability of concrete and reinforced concrete bridge supports

Introduction. The article considers the aspects of the effect caused by the concrete biological corrosion on the durability of concrete and reinforced concrete structures of transport infrastructure facilities. Examples of real objects with identified areas of the combined effect of bio- and other types of the concrete corrosion are considered.

Aim. The study aims at investigating the processes of biofouling on the surface of bridge supports and mechanisms of biomass formation on the concrete surface depending on the mode of the fluid movement in the river flow.

Methods and materials. The dependence of the Reynolds number on the temperature and the coefficient of the river water kinematic viscosity is considered. A physical and mathematical model of the biocorrosion mass transfer, occurring during the flowover of a two-row bridge support system by a liquid flow under small Reynolds numbers, was developed and calculated.

Results. Due to the developed physical and mathematical model, the service life of the reinforced concrete bridge supports can be calculated, the “residual” durability can be determined, as well as the possible time of cleaning the concrete surface from biodeposits can be obtained.

Conclusions. According to the results of the conducted research, the dependence of the concrete biocorrosion effect on the process of the surface biofouling of concrete/reinforced concrete supports is revealed. In addition, the article provides the calculation of economic efficiency of the measures for cleaning concrete from biofouling. According to the calculation, the annual economic effect amounted to 9% of the budgeted cost of the performed works. In the case of perfoming scheduled preventive measures for cleaning from biofouling at least once every 5 years, the period for carrying out inter-repair work for eliminating defects in concrete and reinforced concrete building structures can be increased by 1.5 times. On the basis of the performed calculation, the recommendations on the increase in the durability and the period of the effective operation of bridge structures are provided.

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