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Creating cosmic concrete from space dust and astronaut blood

With the cost of taking bricks to Mars making homes there more expensive than Sydney waterfront properties, scientists tell of a blood-curdling discovery.

Mike Simpson by Mike Simpson
13-09-2021 16:19
in News
Image by WikiImages from Pixabay

Image by WikiImages from Pixabay

Transporting a single brick to Mars can cost around two million Aussie dollars – making the future construction of a Martian colony seem prohibitively expensive.

But scientists at The University of Manchester in the UK have now developed a way to potentially overcome this problem: by creating a concrete-like material made of extra-terrestrial dust along with the blood, sweat and tears of astronauts.

In their study – published on 13 September in Materials Today Bio – the researchers say they’ve discovered that a protein from human blood, combined with a compound from urine, sweat or tears, could glue together simulated moon or Mars soil.

This would produce a material stronger than ordinary concrete, perfectly suited for construction work in extra-terrestrial environments.

Astronauts must use on-site resources

The cost of transporting a single brick to Mars has been estimated at about US$2-million, meaning future Martian colonists cannot bring their building materials with them. Rather, they will have to utilise resources they can obtain on-site for construction and shelter.

This is known as in-situ resource utilisation (or ISRU) and typically focuses on the use of loose rock and Martian soil (known as regolith) and sparse water deposits. However, there is one overlooked resource that will, by definition, also be available on any crewed mission to the Red Planet: the crew themselves.

In their article, the UK-based scientists demonstrated that a common protein from blood plasma – human serum albumin – could act as a binder for simulated moon or Mars dust to produce a concrete-like material. The resulting novel material, termed AstroCrete, had compressive strengths as high as 25 MPa (Megapascals), about the same as the 20–32 MPa seen in ordinary concrete on Earth.

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However, the scientists found that incorporating urea – which is a biological waste product that the body produces and excretes through urine, sweat and tears – could further increase the compressive strength by over 300%, with the best-performing material having a compressive strength of almost 40 MPa, substantially stronger than ordinary concrete.

The answer was inside us all along

Dr Aled Roberts from The University of Manchester, who worked on the project, said the new technique holds considerable advantages over many other proposed construction techniques on the moon and Mars.

“Scientists have been trying to develop viable technologies to produce concrete-like materials on the surface of Mars, but we never stopped to think that the answer might be inside us all along”, he said.

The team investigated the underlying bonding mechanism and found that the blood proteins ‘curdle’ to form an extended structure with interactions known as ‘beta sheets’ that tightly holds the material together.

“The concept is literally blood-curdling,” Dr Roberts explained, only slightly tongue-in-cheek.

Tags: MarsScientific researchSpaceUnited Kingdom
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