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Chinese researchers have created a revolutionary runway safety system using ultra-lightweight foam concrete, nicknamed "marshmallow" concrete, that gently arrests hundred-tonne class aircraft during emergency landings.

The research team developed a new material, resembling ordinary concrete but featuring over 80 percent porosity and weighing just 200 kg per cubic meter -- a tenth of the weight of standard concrete.

This material creates a "soft barrier" that absorbs kinetic energy through controlled crushing. "It looks solid, but crumbles upon impact, decelerating planes smoothly," explained Fang Jun, a CBMA research and development engineer.

To develop an extraordinary ability to absorb energy through fracturing, the mechanical collapse performance of ultra-light foam concrete must be precisely controlled.

Using the Boeing 747 as an example, he explained that the foam concrete used for impact resistance must be maintained within a precise strength range of 0.30 to 0.35 megapascals. "For ordinary foam concrete, higher strength is typically better. However, our material operates under the requirement of lower strength, with a very narrow fluctuation range," said Fang.

International technical proposals utilize calcium sulfoaluminate cement as a raw material, which offers advantages such as rapid hardening and reduces forming difficulties.

However, its high cost poses challenges for many low-cost small airports. Additionally, the inherent properties of calcium sulfoaluminate cement can lead to powdering over extended service periods.

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Originally posted by SIGNYM:
Interesting, but not in the way she thinks.
She's expressing the discomfort of immigrants and first-generations.

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Originally posted by JAYNEZTOWN:
Nvidia to sell H20 chips to China again after US gives export approval
https://au.finance.yahoo.com/news/nvidia-sell-h20-chips-china-07564706
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