Self Healing Concrete Seminar Report: Abstract
Self-healing concrete could solve the problem of concrete structures deteriorating well before the end of their service life. Concrete is still one of the main materials used in the construction industry, from the foundation of buildings to the structure of bridges and underground parking lots. Traditional concrete has a flaw, it tends to crack when subjected to tension.
A healing agent that works when bacteria embedded in the concrete convert nutrients into limestone has been under development at the Civil Engineering and Geosciences Faculty in Delft since 2006. The project is part of a wider program to study the self-healing potential of plastics, polymers, composites, asphalt and metals as well as concrete. Dr Henk Jonkers, a microbiologist who specializes in the behavior of bacteria in the environment, has developed self-healing concrete in the laboratory and full-scale outdoor testing started in 2011. The first self-healing concrete products (successful research results permitting) hit the market in two years' time and are expected to increase the lifespan of many civil engineering structures. Jonkers has worked closely with civil and structural engineers to learn about the properties of concrete and steel reinforcement and develop the concrete. “For a biologist to work with civil engineers to incorporate living matter into the structural concrete material is in itself a great innovation,” he says. There are various types of bacteria used in bacterial concrete construction are: Bacillus pasteurizing, Bacillus sphaericus, Escherichia coli, Bacillus subtilis, Bacillus cohnii, Bacillus balodurans and Bacillus pseudofirmus.
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