Biotech cementitious materials : some aspects of an innovative approach for concrete with enhanced durability

摘要

The deterioration of reinforced concrete structures is a very common problem due to the fact that thismaterial has a high permeability which allows water and other aggressive media to enter, thus leadingto corrosion problems. The use of sealers is a common way of contributing to concrete durability. However,the most common ones are based on organic polymers which have some degree of toxicity. The Regulation(EU) 305/2011 related to the Construction Products Regulation emphasizes the need to reducehazardous substances. Therefore, new low toxicity forms to increase concrete durability are needed.Recent investigations in the field of biotechnology show the potential of bioinspired materials in thedevelopment of low toxic solutions. This paper reviews current knowledge on the use of bacteria for concretewith enhanced durability. It covers the use of bacteria in concrete mix and also biomineralization inconcrete surface treatments. Investigation gaps are described. Results from practical applications inwhich there is exposure to environmental conditions are still needed in order to confirm the importanceof this new approach.