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Self-healing concrete

19.03.2020

Scientists from the US state of Colorado, using bacteria, have created a "living" concrete that can self-repair. Concrete is the backbone of urban planning all over the world. Unfortunately, the varieties of concrete that exist today are destroyed sooner or later.

According to American scientists, the new material is a mixture of sand, which regularly feeds the composition with hydrogel liquid and bacteria of the genus Synechococcus. The gel-like mass provides the microbes with the substances necessary for growth, and as they develop, they produce calcium carbonate. It is this substance that gives the material its strength.

The composition created by the Americans with bacteria, under certain conditions, is able to fully recover. For example, if a brick created using a new technology is broken, it can be regrown by dousing it with a mixture of hydrogel and sand.

Under the influence of the sun and nutrients from the hydrogel, the bacteria literally come to life and help the brick to return to its original shape. The resulting material is as strong as concrete. However, in conditions that are too dry, bacteria can die and the bricks can lose their self-healing properties.

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Ice and earthquakes 19.09.2008

Geophysicist Andrea Hampel of the Ruhr University in Germany became interested in the fact that about 9000 years ago, a number of large earthquakes occurred in Scandinavia, while today the region is considered seismically calm.

It turned out that the outbreak of seismic activity coincided with the melting of a thick ice cap that covered the area during the last glaciation. A computer model has shown that a layer of ice several hundred meters thick can suppress many types of tectonic faults and shifts with its weight. True, stresses in the crust still continue to accumulate, so that after warming, the frequency and strength of earthquakes increase.

Andrea Hampel warns that Alaska, Greenland and Antarctica will experience more earthquakes due to global warming.

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