EL TEACHER’S BLOG

English Learning

Healing concrete

Publicado en BACHILLERATO/PSE, ESO/CSE — 16 Mayo 2017 @ 19:49

Below you will find two comprehension activities about the topic above mentioned. You decide which one to do. I hope you enjoy them.

Click on the link to watch (and listen to) the video:

http://edition.cnn.com/videos/tv/2015/05/13/spc-make-create-innovate-self-healing-concrete.cnn

Read the article first and then number the paragraphs in the correct order:

Here is a living concrete

____ It’s the kind of thing that could save vulnerable roads, bridges, staircases, and buildings. But it comes with a double-edged sword: it could mean a revival of brutalist architecture.

____ Okay, Henk Jonkers hasn’t created a new form of life. What he did find is a kind of bacteria that lies dormant until activated by water. Water is exactly what causes many concrete structures to crack further after they’ve suffered an initial abrasion—the water gets in, freezes, and expands. The idea is that the bacteria put a stop to that.

____ The bacillus bacteria comes out of its spore hibernation when activated by water and thrives in the concrete environment. They’re stored in a small plastic bubble along with calcium lactate, which is mixed in with the concrete. When cracks form and water gets in, it melts the plastic shell, exposing the bacteria to the water. The microorganisms come out of dormancy and feed on the calcium lactate, producing limestone inside the concrete.

____  A Dutch inventor has come up with an ingenious way for concrete to repair its own cracks: It’s alive.

 By

Source: CNN

Once you have decided the order, check it on:

http://www.popularmechanics.com/technology/design/a15576/concrete-heal-thyself/

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