Re-healable concrete to undergo key outdoor testing

Bacterial spores are added to the concrete mix and they are activated by water.

A concrete that patches up cracks by itself is to undergo outdoor testing. The experimental concrete contains limestone-producing bacteria, which are activated by corrosive rainwater working its way into the structure.  This new material could potentially increase the service life of the concrete – with considerable cost savings as a result.

 

 

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‘Sensing skin’ for concrete would detect tiny cracks

sensingskin

MIT researchers tested the ‘sensing skin’ by attaching it to the underside of a concrete beam, then applying enough force to cause tiny cracks to form in the beam under one patch of the skin.

The American Society of Civil Engineers (ASCE), in 2009,  assigned a grade of “D” to the overall quality of infrastructure in the United States, saying that ongoing evaluation and maintenance of structures was necessary to improve that grade. Since then, federal stimulus funds have made it possible for communities to repair some infrastructure, but high-tech, affordable methods for continual monitoring remain in their infancy. Instead, most evaluation of bridges, dams, schools and other structures is still done by visual inspection, which is slow, expensive, cumbersome and in some cases, dangerous.

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Cracks in the Moon Reveal the Moon is Getting Smaller

moon

Experts believe the cracks were created by rupturing of the brittle lunar crust as the Moon shrinks due to its interior cooling.

Cracks in the surface of the Moon suggest that our nearest neighbour in space is getting smaller.  Like a deflating balloon, the satellite is contracting as its interior cools, scientists believe.

 

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