Please wait.'

Page is loading'


Home  > Raw materials & technologies  > Science today - coatings tomorrow  > Bacteria heal cracks in concrete

Thursday, 19 September 2019
pdf
Raw materials & technologies, Science today - coatings tomorrow

Bacteria heal cracks in concrete

Sunday, 11 November 2012

Concrete cracks under tension very easy - the biggest disadvantage of the material. Self-healing properties would be the most charming solution instead of increasing the steel content in buildings. Researchers from TU Delft are working on an unusual possibility.

No more cracks in concrete thanks to bacteria

Source: TU Delft

No more cracks in concrete thanks to bacteria

Source: TU Delft

By embedding calcite-precipitating bacteria in the concrete mixture, it is possible to create concrete that has self-healing capacities.

As the pH value of concrete is very high, only the so-called alkaliphilic bacteria are able to survive. Henk Jonkers, Faculty of Civil Engineering and Geosciences, Materials Sciences and Sustainable Construction Water Resources section and his colleagues from TU Delft have mixed several of these bacteria into a cement paste and after a month found the spores of three particular bacteria where still viable.

Gaining calcite from bacteria

Currently, their research focuses on creating the right conditions for the bacteria to produce as much calcite as possible and on optimizing the distribution of food for the bacteria.

In addition, the researchers are also looking at the self-healing ability of bacterial concrete and how this is affected by the various deterioration mechanisms involved, such as sulfate attacks or temperature fluctuations.

TU Delft working on several concrete projects

The Self Healing Concrete project is part of the TU Delft wide Self-healing Materials research programme at the Delft Center for Materials (DCMat). Furthermore, they collaborate with the Biotechnology section at the Faculty of Applied Sciences and the South Dakota School of Mines in the United States.
All of the research is done at the TU Delft’s Microlab, where fracture testing equipment as well as numerical tools for structure information and fracture modeling are available.

top of page
Comments (0)
Add Comment

Post comment

You are not logged in

register